Answers
Oxidation takes place at the anode. Reduction takes place at the cathode. Oxidation takes place on the left and recution takes place on the right.
The standard cell notation for an electrolytic cell with alumium and gold electrodes:
[tex]Al(s)\lbrack Al^{3+}(aq)\parallel Au^+(aq)]Au(s)[/tex]To determine which metal undergoes oxidation and which undergoes reduction we use the standard cell potentetial of the metals. Au is the stronger oxidising agent of the two and so it is likely to undergo reduction and so the Al will undergo oxidation.
Answer: A
Related Questions
Predict the missing component
in the nuclear equation.
175/71 Lu → 4/2 He + X
Answers
Answer:
B
Explanation:
Corn oil, ice, and ethanol are mixed in the same container. What will be the order of the liquids once they settle out from top to bottom ? A. corn oil, ice, ethanol B. ethanol, ice, corn oil C. ice, ethanol, corn oil D. corn oil, ethanol, ice
Answers
The order of the liquids will depend on the density of each of them. The densest will go to the bottom of the container, the least dense will be on top.
Let's see what the density of each of the substances is, let's assume that we are at room temperature.
Ice density = 0.917g/cm^3
Corn oil density =0.925g/cm^3
Ethanol density = 0.789g/cm^3
The order of density from lowest to highest is:
Ethanol < Ice < Corn oil
This will be the order from top to bottom, so the answer will be:
B. ethanol, ice, corn oil C
Name something you use in your home that could be considered an acidic, basic, and neutral solution. Use properties of acids and bases to tell why do you think the solutions you chose could be considered acidic, basic, or neutral.
Answers
Acidic solution I use: Lemon Juice (Citric acid)
I know this is acidic because it is sour in taste just like all other acids.
Basic solution I use: Handwash
I know this is basic because it is soapy and slippery in nature, and it dissolves oil and grease.
Neutral solution I use: Water
I know this is neutral because it has equal number of H+ and OH- ions.
What are Acids and Bases?An acid is any hydrogen-containing substance that has the ability to donate a proton (hydrogen ion) to another chemical. In order to accept a hydrogen ion from an acid, a molecule or ion must be a basic.The pH scale, where pH stands for "potential of hydrogen," can be utilized to determine the numerical value of a substance's level of acidity or basicity. How acidic or basic a substance is, that can be determined using the pH scale, which is the most used and reliable method. From 0 to 14, on a pH scale, a chemical can range from being the most acidic to the most basic.Using litmus paper is a further method of determining an object's acidity or basicity.Litmus paper comes in two colors, red and blue, and can be employed to distinguish between acids and bases. In an acidic environment, blue litmus paper turns red, and in an alkaline or basic environment, blue litmus paper turns red.To learn more about Acids and Bases, refer to:
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How many moles of C₂H5OH
are there in 45.0 mL of 0.250 M
C₂H5OH?
Answers
Answer:
no. of moles = 0.0113
Explanation:
To calculate the number of moles of a substance given its concentration and volume, we can use the following formula:
[tex]\boxed{\mathrm{No. \ of \ moles = Concentration \times \frac{Volume}{1000}}}[/tex],
where concentration is mole/dm³ or M, and volume is in cm³ or ml.
In this question, we are told that:
• concentration = 0.250 M
• volume = 45.0 ml
Substituting these values into the formula above, we get:
No. of moles = [tex]0.250 \times \frac{45.0}{1000}[/tex]
= [tex]0.250 \times 0.045[/tex]
= 0.01125
[tex]\approx[/tex] 0.0113 (3 s.f.)
Therefore, the number of moles of C₂H₅OH is 0.0113.
The 0.0112 moles of C2H5OH are present in the 0.250 M solution of C2H5OH.
What is a mole?
Mole is used as a concentration unit in chemistry terms. One mole is equal to the mass of the given compound which is divided by the molar mass of the same compound.
Given:
M= 0.250M ( M stands for molarity)
Volume = 45.0 ml
The molar mass of C2H5OH = 46.07 g/mol
Now, we use molarity formula M = Moles of the substance/volume in liter
Let say moles = x
Units of M = mol/L
Therefore, units of volume need to be converted in to Liters = 1L = 1000ml
By using molarity equation, X= 45.0*0.250/1000 = 0.0112 moles
Hence, the required number of moles of C2H5OH = 0.0112 moles.
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For the reaction: 2 A (g) + B (s) ⇌ 2 C (s) + D (g) Kp = 8210
At 298 K in a 10.0 L vessel, the known equilibrium values are as follows: 0.021 atm of A, 0.22 mol of B, and 10.5 mol of C. What is the equilibrium partial pressure of D?
Answers
Answer:D
Explanation:
The equilibrium partial pressure of D is 0.362atm.
2A(g) + B(s) <==> 2C(s) + D(g)
The pressure that a gas, in a mixture of gases, would exert if it alone occupied the whole volume occupied by the mixture is called partial pressure of the gas.
In the equilibrium expression, we ignore solids as they are considered to have a value of unity. Thus, we can write the equilibrium expression for the above reaction as:
K = (PD) / (PA)²
where, K = Partial pressure equilibrium
PD = Partial pressure of gas D
PA = Partial pressure of gas A
Kp = 8210
PA = 0.021 atm
8210 = PD / (0.021)²
PD = 8210 × (0.021)²
PD = 0.362 atm.
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Which has the incorrect name-formula combination? A) Cobalt(II) chlorite - Co(CIO2)2 B) Iron(II) chlorate - FECIO4 C) Manganese(II) perchlorate - Mn(CIO4)2 D) Chromium(III) hypochlorite - Cr(CIO)3
Answers
The incorrect name-formula combination is FeCIO₄ - Iron(I) perchlorate; option B.
What is the IUPAC nomenclature of the given compounds?The IUPAC nomenclature of naming compounds refers to the convention of naming compounds using the oxidation states of the elements present in the compound.
The IUPAC nomenclature of the given compounds is given below as follows:
A. Co(CIO₂)₂ - Cobalt(II) chlorite; the oxidation state of cobalt is +2
B. FeCIO₄ - Iron(I) perchlorate; the formula of the compound is wrong because iron does not exist in the +1 state
C)Mn(CIO4)₂ - Manganese(II) perchlorate; the oxidation state of manganes is +2
D) Cr(CIO)₃ - Chromium(III) hypochlorite ; the oxidation state of chromium is +3
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During an experiment, a student adds 1.23 g CaO
to 200.0 mL
of 0.500 M HCl
. The student observes a temperature increase of 5.10 °C
.
Assuming that the solution's final volume is 200.0 mL
, the density is 1.00 g/mL
, and the heat capacity is 4.184 J/g⋅°C
, calculate the heat of the reaction, Δrxn
.
CaO(s)+2H+(aq)⟶Ca2+(aq)+H2O(l)
CaO
(
s
)
+
2
H
+
(
aq
)
⟶
Ca
2
+
(
aq
)
+
H
2
O
(
l
)
Answers
The heat released by the experiment, assuming that the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/g⋅°C is -194 KJ/mol.
What is density?Density is defined as mass of a material substance per unit of the volume. The equation for density is d = M/V, where d stands for density, M for mass, and V for volume.
Grams per cubic centimeter are a common unit of density measurement. For instance, the density of Earth is 5.51 grams per cubic centimeter, whereas the density of water is 1 gram per cubic centimeter.
The equation of the reaction is;
CaOH(aq) + 2HCl(aq) --------> CaCl2(aq) + 2H2O(l)
From the information provided in the question;
No. of moles of CaO = 1.23 g/ 56 g/mol = 0.022 moles
No. of moles of HCl = 0.500 M × 200/1000 = 0.1 moles
We now have to obtain the limiting reactant
From the reaction equation;
one mole of CaO reacts with 2 moles of HCl
0.022 moles moles of CaO reacts with 0.022 moles × 2 moles/1 mole
= 0.044 moles
Hence there is more than enough HCl so CaO is the limiting reactant.
Temperature rise of the reaction = 5.10 °C
Total volume of solution = 200.0 ml
Density of solution = 1.00 g/ml
Mass of solution = 200 g
Heat capacity of solution = 4.184 J/g·°C
We know that, heat absorbed by solution = heat released by the reaction
Heat absorbed by solution = mcθ
m = mass of solution
c = heat capacity of solution
θ = temperature rise
Substituting values;
ΔH = 200g × 4.184J/g·°C × 5.10°C
ΔH = 4.27 KJ
Therefore, heat released by the reaction;
ΔHrxn = (- 4.27 KJ)/0.022 moles
ΔHrxn = -194 KJ/mol
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The Kp for the reaction A (g) ⇌ 2 B (g) is 0.0440. What is Kp for the reaction 4 B (g) ⇌ 2 A (g)?
Answers
The Kp for the reaction is 516.52.
When a chemical process reaches equilibrium, the equilibrium constant (often represented by the letter K) sheds light on the interaction between the reactants and products.
The equation is :
A (g) ⇌ 2 B (g)
The reaction in question is the reverse of 2 times the original
4 B (g) ⇌ 2 A (g)
K for the reverse reaction is 1/K forward
K for doubling the coefficients is K squared
Therefore K in the present condition is 1 / K2 of the original...
1 / (0.044)² = 516.52
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Which of the following elements would you expect to have the greatest electron affinity? He, K, Co, S, Cl
Answers
The electron affinity of the given elements in question is Cl>S>Co>K>He, in the order of highest to lowest.
What is electron affinity?
When an electron is added to a neutral atom to create a negative ion, the energy of the atom changes (in kJ/mole). This is how electron affinity is defined. Or, the probability that a neutral atom will capture an electron.
The electron affinity decreases when we go left to right in the periodic table. But, there is a exception that the nobel gases has extremely low electron affinity. Among the given elements He is nobel gas so it has very low electron affinity and for the other elements we will check which element is located in left most position in periodic table that element has the highest electron affinity.
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1) A cup of kidney beans weighs about 177 g, and contains 15 g of protein, 1.0 g of fat, and 39
g of carbohydrate. Determine the amount of protein, fat, carbohydrate, and the total
energy content (in nutritional calories) for a 100 g sample of beans.
Answers
The total energy contain for a 100g sample of beans is 0.24 kcal.
What is energy contain?
the capacity for doing work. It may exist in kinetic, thermal, electrical or chemical, nuclear, or various forms. There are moreover, heat and work eg, energy in the process of transfer from one body to other.
Sol-
15 g protein x 4 cal/g = 60 cal
1.0 g fat x 9 cal/g =
9 cal
42 g carb x 4 cal/g =
168 cal
Total calories =
60 + 9 + 168 = 237 calories
237 cal x 1 kcal/1000 cal = 0.237 kcal
The significant figure would 0.24 kcal .
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What is the mass percentage of carbon in 5.00g of sucrose? 50.00g of sucrose? 500.0g of sucrose?
Answers
Because amount has no effect on mass percentages, the mass percentage of carbon in 5, 50, and 500 g of sucrose is 42.1 %
The mass:
It also represents the body's inertia, or resistance to acceleration (change in velocity) when a net force is applied. The mass of an object dictates the strength of its gravitational attraction to other bodies.
The kilogram is the SI base unit of mass (kg). Mass is not the same as weight in physics, despite the fact that mass is frequently calculated by measuring the object's weight using a spring scale rather than a balance scale and comparing it directly with known masses. Because of the reduced gravity, an object on the Moon would weigh less than it does on Earth, yet it would still have the same mass.
Molecular formula of sucrose is C12 H22 O11
Molar mass of Sucrose , C12 H22 O11 is = ( 12 x 12 ) + ( 22 x 1 ) + ( 11 x 16 ) g/mol
= 342 g/mol
The molar mass of Carbon is 12 g/mol
342 g of C12 H22 O11 contains 12 x 12 g of C
5 g of C12 H22 O11 contains Y g of C
Y = ( 12x12x 5 ) / 342
= 2.105 g of C
mass % of C = (mass of C / mass of sucrose ) x 100
= (2.105 / 5 ) x 100
= 42.1 %
342 g of C12 H22 O11 contains 12 x 12 g of C
50.0 g of C12 H22 O11 contains Y g of C
Y = ( 12x12x 50 ) / 342
= 21.05 g of C
mass % of C = (mass of C / mass of sucrose ) x 100
= (21.05 / 50 ) x 100
= 42.1 %
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Scientists discover a species that is unicellular and has chloroplasts. What could it be
Answers
Answer: dinophyte
Explanation: its a type of protist. it is unicellular and has chloroplasts
Scientists discover a species that is unicellular and has chloroplasts. It could be a dinophyte.
A single-celled eukaryotic group (Protists) called a dinophyte makes up the phylum Dinoflagellates. They possess chloroplasts and are single-celled.
What are Protists?Any eukaryotic organism that is neither an animal, plant, nor fungus is referred to as a protist. Eukaryotic organisms are those whose cells contain a cell nucleus. Even as other eukaryotes are not present, protists do not constitute a natural group or clade, despite the likelihood that they share a common ancestor (the last eukaryotic common ancestor). Consequently, some protists may have a closer relationship with plants, animals, or fungi than they do with other protists. Protist is a biological category that is only used for practical purposes, much like the groups of algae, invertebrates, and protozoans. Others define a protist as any eukaryotic unicellular microbe. Protistology is the field of study that focuses on protists.To learn more about Protists, refer to:
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What is the mass in grams of magnesium chloride that can be produced from 4.61 moles of chlorine gas reacting with excess magnesium? Mg(s) + Cl₂(g) → MgCI₂(s)
Answers
The mass of MgCI₂ produced from 4.61 moles of chlorine is 437.95g
What is mole ?
In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles.
The mole designates 6.02214076 1023 units, which is a very large number. The mole for the International System of Units is this quantity, according to the General Conference on Weights and Measures (SI)
Mg(s) + Cl₂(g) → MgCI₂(s)
1mol Cl2 gives 1 mol MgCl2
4.61mol Cl2 gives 4.61 mol MgCl2
Mass of 1 mol of MgCl2 = 24+35.5*2 = 95g
Mass of 4.61 mol of MgCl2 = 437.95g
The mass of MgCl2 produced from 4.61 moles of chlorine is 437.95g
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Oxidation number of each element in the compound (NH4)2CrO4
Answers
Answer:
the oxidation number of N in (NH4)2CrO4 is -3. the oxidation number of O in (NH4)2CrO4 is -2. the oxidation number of Cr in (NH4)2CrO4 is +6. the oxidation number of H in (NH4)2CrO4 is +1
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N has an oxidation number of -3, O has an oxidation number of -2, and Cr has an oxidation number of +6 in the compound (NH4)2CrO4. The H in (NH4)2CrO4 has an oxidation number of 1
What is oxidation number?Oxidation number is defined as how many electrons a given atom or ion has either gained or lost when compared to a neutral atom. Any free element's oxidation number is always zero. The meaning was expanded to cover additional reactions in which electrons are lost, regardless of whether oxygen was present, since the substance loses electrons when it is oxidized.
In the case of a monatomic ion, the oxidation number is always the same as the ion's charge. The name of the compound is ammonium chromate which has oxidation number both in positive as well as negative charge electrons.
Thus, N has an oxidation number of -3, O has an oxidation number of -2, and Cr has an oxidation number of +6 in the compound (NH4)2CrO4. The H in (NH4)2CrO4 has an oxidation number of 1.
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slice of Swiss cheese contains 42 mg of sodium.
(a) What is this mass in grams?
g
(b) What is this mass in ounces? (16 oz = 453.6 g)
oz
(c) What is this mass in pounds? (1 lb = 453.6 g)
Answers
grams would be 47 mg of sodium based on conversion ratios.
a. 0.047
b. 0.00166 ounces
c. 0.000104 kg.
grams of mass
A gram is one gram.
47 mg is equivalent to 0.47 / 1,000 or 0.047 grams.
Since 16 ounces are equal to 453.6 grams of mass, 0.047 grams would be equal to 0.00166 ounces when divided by 453.6.
Weight in Pounds
Given that 1 pound weighs 453.6 grams, 0.047 grams would equal 0.000104 pounds.
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What do you notice about the force and the product of mass and acceleration, ma?
Answers
The force and the product of mass and acceleration, ma , is used to describe the relationship between the mass of object and the amount of force acting to accelerate it.
The newtons second law states that : The force ( F ) acting on a moving body is the product of mass ( m ) and the acceleration ( a).
the expression is given as :
F = ma
where,
F = net force acting on an object
m = mass of the object
a = acceleration
of the object
we can use this formula in three different ways:
1) To calculate the force :
F = ma
2) To calculate the mass :
m = F / a
3) To calculate the acceleration :
a = F / m
Thus, The force and the product of mass and acceleration, ma , is used to describe the relationship between the mass of object and the amount of force acting to accelerate it.
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What particles are found in the nucleus of an atom?
What is the charge of the nucleus?
Answers
Answer:
1. Protons and neutrons
2. Positive charge
Explanation:
A nucleus contains protons and neutrons. Protons have a positive charge and neutrons have a neutral charge. Neutral + positive would still be positive. So logically nucleus is positive charge.
copper, x-rays of frequency 2.74 × 10^19 Hz
are emitted. What is the wavelength of these
x-rays?
Answer in units of pm.
Answers
The wavelength of the x-rays is 1.094 * 10⁻⁵ pm.
What is the relationship between the frequency and wavelength of a wave?The frequency of a wave is the number of complete oscillations completed by the wave per second. Its unit is Hertz.
The wavelength of a wave is the distance between successive points in phase in the wave. It is measured in units of meter.
The relationship between the wavelength and frequency of a wave is given below.
Wavelength = velocity of the wave / frequency
The frequency of X-rays = 3.0 * 10⁸ m/s
frequency of the wave = 2.74 × 10¹⁹ Hz
Wavelength = (3.0 * 10⁸ m/s) / (2.74 × 10¹⁹ Hz)
wavelength = 1.094 * 10⁻¹¹ m
wavelength = 1.094 * 10⁻⁵ pm.
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a graduated cylinder contains 25.8 ml of water.Due drops 2 glass marbles weighting 6.5 g into the cylinder.Thew new water level reads 27.2 ml what is the volume of the marbles.What is the density of the marbles
Answers
According to this question, a graduated cylinder contains 25.8 mL of water. 2 glass marbles weighing 6.5 g was dropped into the cylinder. The new water level reads 27.2 mL.
This means that the volume of the marbles can be calculated as follows:
27.2mL - 25.8mL = 1.4mL
The volume of the marbles is 1.4mL.
Density is a measure of the mass of matter contained by a unit volume. The density can be calculated by dividing the mass by the volume as follows:
Density = 6.5g ÷ 1.4mL = 4.64g/mL
The density of the marble is 4.64g/mL.
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The absolute magnitude (brightness) of Antares is -5.28, and the absolute magnitude of procyon is 2.68. Which star is more luminous? Which star is closer?
Answers
The absolute magnitude (brightness) of Antares is -5.28, and the absolute magnitude of procyon is 2.68 then antares star is more luminous and antares is closer
Magnitude is simply defined as the distance or quantity and absolute or relative direction or size in which an object move in the sense of motion called magnitude and here given data is
Absolute magnitude of Antares = -5.28
Absolute magnitude of procyon = 2.68
And here given according to the given magnitude the Antares has negative magnitude so it is star closer and also the more luminous star because the Absolute magnitude of procyon is in positive number so it is far away and not a luminous as well as closer star so the because of less magnitude the antares star is more luminous and antares is closer
Larger magnitudes correspond to fainter stars so here 2.68>-5.28 and that means Antares appear in closer star as well as more luminous
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What is the density of a sample if its mass is 44.3g and its volume is 22.1cm?
Answers
Answer:
about 2 g/cm
Explanation:
D = M/V
D = 44.3/22.1
D ≈ 2
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Give the shell electron configuration for the following. (For example, the shell electron configuration of lithium is written 2,1.)(a) fluorine(b) nitrogen
Answers
(a) Fluorine= (2,7)
(b) Nitrogen=(2,5)
In its native state, which element has bonds between many cations and a sea of valence electrons?
O He
O CI
O Zn
Ο Ν
Answers
Answer: The correct answer is C. Zn
Explanation: Zn in its native state has bonds between multiple cations and a sea of valance electrons.
a balloon has a volume of 1.20 L at 24.0 C. The balloon is heated to 48.0 C. Calculate the new volume of the balloon.
Answers
Answer
To solve this excescise we use the ideal gas equation:
[tex]P.V=n.R.T[/tex]Where:
P is the pressure of the gas
V is the volume
T is the temperature
R is the ideal gas constant
n is the number of moles
As the balloon is a closed recipient n is the same in state 1 (T: 24°C) and state 2 (T: 48°C).
R is a constant so also remains the same.
The pressure is also a constant in this case as the only thing that we do to the balloon is heat it.
So therefore:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}=\frac{n.R}{P}[/tex]Now we calculate the volume at 48°C (V2):
[tex]V_2=\frac{V_{1.}T_2}{T_1}=\frac{1.2L.48\degree C{}}{24\degree C}=2.4L[/tex]As we can see as the temperature rises the volume of the gas increases because the molecules have more kinetic energt and they remain farther apart.
The answer then is the new volume of the balloon is 2.4L
Not a timed or graded assessment. Quick answer = amazing review :)
Answers
We have this reaction:
C + O2 ===> CO2
The compounds on the left of the arrow are the reactants, the ones on the right are called products.
Answer: Carbon and Oxygen are reactants
You are in charge of a plant that makes methyl bromide, CH3Br. This compound is used as a fumigant for nematodes. The thermochemical equation for the reaction is: CH3OH(aq) + Br−(aq) equilibrium reaction arrow CH3Br(aq) + OH −(aq) ΔH = +78 kJ/mol. You must maximize the yield of the product. Which of the following actions should you take? (Select all that apply.)
remove Br− ion
remove CH3OH
allow excess CH3Br to build up in the reaction
run the reaction with excess CH3OH
run the reaction with excess Br− ion
cool the reaction
heat the reaction
remove CH3Br as it is formed
Answers
You are in charge of a plant that makes methyl bromide,CH₃Br this compound is used as a fumigant for nematodes the thermochemical equation for the reaction is: CH₃OH(aq) + Br⁻(aq) equilibrium reaction arrow CH₃Br(aq) + OH⁻(aq) ΔH = +78 kJ/mol you must maximize the yield of the product when run the reaction with excess CH₃OH
Thermochemical is the reaction in which energy and heat associated with chemical reaction or physical transformation
The yield is maximum because the reactant will allow more and more to build up the reaction and here given reaction is
CH₃OH(aq) + Br⁻(aq)
In which when run the reaction with excess CH₃OH then automatically the yield of the reaction is become maximize and in the reaction the reactant run in excess amount automatically the yield as well as the product are become more
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What is the amount of valence electrons in an atom equivalent to?The amount of protons an atom hasThe group the atom is locatedThe period the atom is locatedThe amount of electrons an atom has
Answers
ANSWER
The amount of valence electron in an atom is equivalent to the group the atom is located
EXPLANATION
Valency is define as the combining power of an element. Valence electrons are electrons located at the outer most shell of an element.
Valence electrons tell us the group a particular element belongs to and also the chemical properties of the element.
For example, sodium atom
Sodium has the below electronic configuration
[tex]\text{ 1s}^2\text{ 2s}^2\text{ 2p}^6\text{ 3s}^1[/tex]The structure above represents a sodium atom. The structure contains a single electron at the outer most shell of the atom. The single electron is called the valence electron of sodium. Hence, sodium belongs to group 1
Therefore, the amount of valence electron in an atom is equivalent to the group the atom is located
Arrange the following elements in order of decreasing atomic size.
Rank the atoms from the largest to smallest. To rank items as equivalent, overlap them
Answers
The arrangement of the in order of decreasing atomic size is as follows:
K > Al > P > Cl > ArWhat is the atomic size of atoms?The atomic size of an atom is the diameter of the atom and is calculated as half the distance between the nuclei of two covalently-bonded nuclei of the atom.
The atomic size of elements increases down a group but decreases across a period.
The reason for this trend is that, on going down a group, an extra electron shell is added to the element below. However, across a period, the electron shell remains the same whereas the size of the positive nuclear charge increases, therefore, the atomic size of atoms in the same period decreases from left to right across the period.
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Complete question:
Arrange the following elements in order of decreasing atomic size.
Rank the atoms from the largest to smallest. To rank items as equivalent, overlap them: Al, Cl, Ar, P, and K.
a large university says that it has several satellite campuses. what does this mean?
Answers
Answer:
A satellite campus or branch campus or regional campus is a campus of a university or college that is physically at a distance from the original university or college area. This branch campus may be located in a different city, state, or country, and is often smaller than the main campus of an institution.
metric preferred to write 5.8 * 10 to -3 g
Answers
Since the number is 5.8*10^-3 g, the negative symbol in front of the power of 3 means that there are 3 0's in front of the real number, in standard notation, therefore we will add these 3 zeros to the number
0.0058 grams, and if we multiply it by 1000 we will end up with 5.8 mg, letter C