Explanation:
We have 2CO + O2 => 2CO2.
Moles of CO = 28.6g / (28g/mol) = 1.021mol.
Moles of CO2 = Moles of CO = 1.021mol.
An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 g of cesium-137 disintegrates over a period of 90 years, how many g of cesium-137 would remain?
Answer:
3 half-lives 7. An isotope of Cesium (Cesium-137) has a half life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? of sodium-25 is 60 seconds? : 3 minutes t=601 = 3 half-lives 5.0mg ~ 2.5 mg + 1.25mg →) 625 mg.
Explanation:
Hope this helps
where:
[tex]N_{0}[/tex] = Initial quantity of the sample = 1.0g
t = time in years of disintegration = 90 years
[tex]t\frac{1}{2}[/tex] = Half life of cesium isotope = 30 years
N(t) = Quantity of substance after disintegration = ?
Solving for N(t)N(t) = [tex]1 ( \frac{1}{2})^ \frac{90}{30}[/tex]
N(t) = [tex]1 (\frac{1}{2})^{3}[/tex]
N(t) = 0.125 grams
Therefore, the quantity of cesium-137 that would remain after disintegrating over a period of 90 years is 0.125 grams.
To learn more, visit the link below:
https://brainly.com/question/22608626
Select the correct balanced equation for the combustion of methane.
CH4 + 02 -> CO 2 + H2O
Answer:
A: CH4 + 2O2 -> CO2 + 2H2O
Explanation:
CH4 + O2 -> CO2 + H2OCount how many elements they are in all molecules for the reactants and for the products.
For the reactants:C = 1 element
H = 4 elements
O = 2 elements
For the products:C = 1 element
O = 2 elements
H = 2 elements
O = 1 element
2 oxygen atoms + 1 oxygen atoms = 3 oxygen atoms total on the products side.
To balance this equation, we need to add 2 more elements of hydrogen and 2 more elements of oxygen. Therefore, we add a 2 to the coefficient of O2 for the reactants side and add a 2 to the coefficient of H2O for the products side.
Now let us try it.
CH4 + 2O2 -> CO2 + 2H2OCount how many elements they are in all molecules for the reactants and products.
For the reactants:C = 1 element
H = 4 elements
O = 4 elements
For the products:C = 1 element
O = 2 elements
H = 4 elements
O = 2 elements
2 oxygen atoms + 2 oxygen atoms = 4 oxygen atoms total on the products.
All of the elements are balanced.
So the final answer is A: CH4 + 2O2 -> CO2 + 2H2OHope it helped!
Compound is a dull white smooth solid which does not conduct electricity.
a. True
b. False
Answer:
a. True.
Explanation:
Hello!
In this case, since dullness and smoothness are characteristic of materials that are not able to conduct the electricity, as they do not provide an appropriate pathway for the electrons to move around because of their amorphous structure, we realize the answer is a. True.
On the contrary, a lustrous and robust solid, is actually able to conduct electricity because it provides the pathway for the electron movements and therefore to conduct electricity.
Best regards!
2. Iron reacts slowly with hydrochloric acid to produce iron (II) chloride and hydrogen gas.
Fe + 2HCl FeCl2 + H2
What mass of hydrogen chloride is required to react with 3.56 g of Iron?
Mass of Hydrogen chloride : 4.672 g
Further explanationGiven
Reaction
Fe + 2HCl ⇒ FeCl2 + H2
3.56 g of Iron
Required
mass of Hydrogen chloride
Solution
mol of Iron (Ar = 56 g/mol) :
mol = mass : Ar
mol = 3.56 : 56
mol = 0.064
mol HCl from the equation :
= 2/1 x mol Fe
= 2/1 x 0.064
= 0.128
Mass HCl :
=mol x MW HCl
= 0.128 x 36.5
= 4.672 g
HELPP! What is ammonium nitrates freezing point ?
Answer:
Freezing points for water with freezing mixtures based on salt and ice: Ammonium Nitrate - Chrushed Ice or Snow in Water 1 part Ammonium Nitrate - 0.94 parts Ice/water : temperature -4 o C 1 part Ammonium Nitrate - 1.20 parts Ice/water : temperature -14 o C
Explanation:
Based on the number of valence electrons indicated by its location in the periodic table ,which elements behavior would you predict to be closest to that of potassium (k)
Answer:
Na sodium or Rb rubidium
Explanation:
Because Na is present in first group all members of group 1 have 1 electron in valence shell and show similar properties.
the gravitational force between two objects depends on the distance between the objects and each object?
Answer:
Gravitational force between two objects depends on: a. The weight of the objects c. The mass of each object b. The distance between the objects d. Both b and c Please select the best answer from the choices provided A B C D
✓d
Ramelteon is a hypnotic agent used in the treatment of insomnia: Considering the labeled drawing above, which of the highlighted atoms has a delocalized lone pair? Select all that apply. 1 2 3 Identify the geometry of each atom (except for hydrogen atoms). All sp2-hybridized carbon atoms have geometry. All sp3-hybridized carbon atoms have geometry. The nitrogen atom has geometry. The oxygen atom of the C=O bond has geometry, and the other oxygen atom has geometry.
Answer:
1 and 2
Trigonal planar
Tetrahedral
Trigonal Planar
Linear
Bent ( v- shape)
Explanation:
The highlighted atoms has a delocalized lone pair - 1 and 2
All sp2-hybridized carbon atoms have geometry- Trigonal planar
All sp3-hybridized carbon atoms have geometry - Tetrahedral
The nitrogen atom has geometry - Trigonal Planar
The oxygen atom of the C=O bond has geometry - Linear
and the other oxygen atom has geometry - Bent ( v- shape)
P.S - The correct question is -
Ramelteon has been an aromatic compound with 3 ring structure followed by the aliphatic chain.
The drug has antagonist structure to the melatonin and has been used to treat insomnia by acting as the melatonin representative.
Geometry in the structureThe labelled atom in the structure is oxygen of the pentane ring, nitrogen in the aliphatic chain, and carbonyl oxygen.
The delocalized lone pair has been observed in the compound which has been contributing to the resonating structure. The delocalized lone pair ion the given structure is oxygen of the pentane ring, and nitrogen in the aliphatic chain.
The geometry of the atom has been based on the hybridization and the lone pairs.
The geometry of [tex]\rm sp^2[/tex] hybridized carbon has been trigonal planar. The geometry of [tex]\rm sp^3[/tex] hybridized carbon atom has been tetrahedral. The nitrogen in the chain has trigonal planar geometry. The C=O oxygen has been comprising linear geometry, while the oxygen has bent v shape.
Learn more about hybridization, here:
https://brainly.com/question/13978941
what is the simplified chemical équation for Vinegar diluted in water?
[tex]\purple{\tt{\huge{Answer}}}[/tex]
CH3COOH is an accepted and common form of writing the structure of acetic acid (commonly known as vinegar when diluted in water).
1)
If I have 45 liters of helium in a balloon at 25°C and increase the
temperature of the balloon to 55° C, what will the new volume of the
balloon be?
Answer:
52.8 Liters
Explanation:
Gay-Lussacs law states that P1/T1 = P2/T2
if:
P1 = 45T1 (in Kelvins) = 25 + 273.1 =298.1P2= ?T2 = 55 + 273.1 = 328.1then:
45/298.1 = P2/328.1
P2 = 52.8
The new volume of the balloon is 52.8 Liters this can be calculated by using gas laws.
Charles law:Charles law states the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature. It is given by
V₁/T₁ = V₂/T₂
What information do we have?
V₁ = 45 L
T₁ = 25 + 273.1 =298.1 K
T₂ = 55 + 273.1 = 328.1 K
To find:
V₂= ?
On substituting the values:
45/298.1 = V₂/328.1
V₂ = 52.8 L
Thus, the volume of the balloon is 52.8 liters.
Find more information about Gas law here:
brainly.com/question/555495
The structure of an atom is
Answer:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
Select the correct balanced equation for the double displacement reaction of calcium carbonate and hydrochloric
acid (Rolaids and stomach acid)
CaCO3 + HCL -> CaCl2 + H2CO3
Answer:
B: CaCO3 + 2HCl -> CaCl2 + H2CO3
Explanation:
CaCO3 + HCl -> CaCl2 + H2CO3Count how many elements they are in all molecules for the reactants and for the products.
For the reactants:Ca = 1 element
C = 1 element
O = 3 elements
H = 1 element
Cl = 1 element
For the products:Ca = 1 element
Cl = 2 elements
H = 2 elements
C = 1 element
O = 3 elements
To balance this equation, we need to add 1 more element of Chlorine and Hydrogen. Therefore, we add a 2 to the coefficient of HCl for the reactants side.
Now let us try it.
CaCO3 + 2HCl -> CaCl2 + H2CO3Count how many elements they are in all molecules for the reactants and products.
For the reactants:Ca = 1 element
C = 1 element
O = 3 elements
H = 2 element
Cl = 2 element
For the products:Ca = 1 element
Cl = 2 elements
H = 2 elements
C = 1 element
O = 3 elements
All of the elements are balanced.
So the final answer is B: CaCO3 + 2HCl -> CaCl2 + H2CO3Hope it helped!
Tim and Jose are moving furniture. Tim pushes a 150 kg sofa with 300N
force. As a result, Sofa’s acceleration was __________ according to Newton’s
Second Law of motion. (F = ma)
Answer:
a = 2m/s²
Explanation:
Given data:
Mass of sofa = 150 Kg
Force applied = 300 N
Acceleration = ?
Solution:
Formula:
F = ma
F = force
m = mass
a = acceleration
by putting values,
300 N = 150 Kg × a
a = 300 N /150 Kg
a = 300 Kg m/s² / 150 Kg ( N = Kgm/s²)
a = 2m/s²
Which of the following best explains why Reggie's books fell?
Explanation:
When Reggie's car turned eastward, his books continued heading northward, causing them to slide off the top of his car and fall.
were is the opshons.
Determine the oxidation number of
Sulphur in Sodium thiosulphate
The oxidation number of Sulphur = +2
Further explanationGeneral formula for determining Oxidation Numbers :
1. The number of oxidation of single element atoms = 0. Examples of Ar, Mg, Cu, Fe, N₂, O₂, etc. = 0
Group I : +1
Group II : +2
H in compound = +1, except metal hydride compounds (Hydrogen which binds I or II groups) oxidation number H = -1, for example, LiH, MgH₂, etc.
2. Oxidation number O in compound = -2, except OF2 = + 2 and in peroxide (Na₂O₂, BaO₂) = -1 and superoxide, for example KO₂ = -1/2.
3 The oxidation number in a non-filled compound = 0,
The total amount of oxidation in ion = ion charge, Example NO₃⁻ = -1
Sodium thiosulphate - Na₂S₂O₃
Oxidation number Na = +1 ⇒x2 = +2
Oxidation number O = -2 ⇒x3 = -6
Oxidation number Na₂S₂O₃ = 0
2.Na+2.S+3.O=0
2.+1+2.S+3.(-2)=0
2+2S-6=0
-4+2S=0
2S=4
S=+2
How many molecules are equal to 89.23g of calcium oxide
Answer:
1.593 moles
Explanation:
Therefore, 1.593 moles are equal to 89.23 g of calcium oxide.
Answer:
9.64 × 10²³ molecules
Explanation:
Given data:
Mass of calcium oxide = 89.23 g
Number of molecules = ?
Solution:
First of all we will calculate the number of moles of calcium oxide.
Number of moles = mass/molar mass
Number of moles = 89.23 g/ 56.1 g/mol
Number of moles = 1.6 mol
Number of molecules;
1 mole contain 6.022 × 10²³ molecules
1.6 mol × 6.022 × 10²³ molecules / 1mol
9.64 × 10²³ molecules
The number 6.022 × 10²³ is called Avogadro number.
2 NaOH (s) + CO2(g) → Na2CO3 (s) + H20 (I) How many grams of water can be produced with 1.85 moles of NaOH
Explanation:
Mole ratio of NaOH to H2O = 2 : 1
Moles of H2O = 1.85mol * (1/2) = 0.925mol.
Mass of H2O = 0.925mol * (18g/mol) = 16.65g.
Answer:
16.65 grams of water can be produced with 1.85 moles of NaOH.
Explanation:
Mole ratio of NaOH to H2O = 2 : 1
Number of moles of water = (1/2)×1.85= 0.925 moles
Molar mass of water (H2O) = 18g/mol
Mass of the right water = 18g/mol×0.925 mol=16.65 grams
what is a physical quantity
Where does gravity from planet Earth actually pull you toward?
Leopard seals are animals adapted to survive in the freezing conditions of Antarctica. Individual leopard seals vary in their different traits.
Which of the following variations would give a leopard seal the greatest chance of surviving in its harsh environment?
A. More spots on its coat. B. Thicker layer of blubber
C. More elongated head
D. Wider, flatter teeth
Answer:
B. Thicker layer of blubber
Explanation:
For the leopard seals to survives this harsh environment, it must have a thicker layer of blubber
Blubber is a thick layer of fat. It is called the adipose tissues and found in most marine organisms.
This layer helps in insulating the body against heat loss. By so doing, the animal is able to conserve internal heat. They have low thermal conductivity and do not easily lose heat or gain heat as such.Answer:
B
Explanation:
4NaOH + 4HCI - NaCl + H20
Answer:
NaOH + HCl —> NaCl + H₂O
Explanation:
From the question given above, we obtained the following equation:
4NaOH + 4HCl —> NaCl + H₂O
The equation can be balance as follow:
4NaOH + 4HCl —> NaCl + H₂O
There are 4 atoms of Na on the left side and 1 atom on the right side. It can be balance by putting 4 in front of NaCl as shown below:
4NaOH + 4HCl —> 4NaCl + H₂O
There are a total of 8 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of H₂O as shown below:
4NaOH + 4HCl —> 4NaCl + 4H₂O
Next, divide through by 4 to express the equation with the lowest coefficients.
NaOH + HCl —> NaCl + H₂O
Now the equation is balanced.
NOTE: Smallest coefficients are always used to represent a balanced equation.
A 25.00 mL sample of an H2SO4 solution of unknown concentration is titrated with a 0.1322 M KOH solution. A volume of 41.22 mL of KOH is required to reach the equivalence point. What is the concentration of the unknown H2SO4 solution? Express your answer in molarity to four significant figures.
Answer:
[tex]0.1090\ \text{M}[/tex]
Explanation:
Volume of [tex]KOH[/tex] = 41.22 mL
Molarity of [tex]KOH[/tex] = 0.1322 M
Number of moles of [tex]KOH[/tex]
[tex]n=\text{Molarity}\times \text{Volume of }KOH\\\Rightarrow n=0.1322\times 41.22\times 10^{-3}\\\Rightarrow n=0.005449284\ \text{mol}[/tex]
2 moles of [tex]KOH[/tex] reacts with 1 mole of [tex]H_2SO_4[/tex]
So,
[tex]0.005449284\ \text{mol}[/tex] of [tex]KOH[/tex] reacts with M mole of [tex]H_2SO_4[/tex]
[tex]M=\dfrac{0.005449284}{2}=0.002724642\ \text{mol}[/tex]
Volume of [tex]H_2SO_4=25\times 10^{-3}\ \text{L}[/tex]
Concentration of [tex]H_2SO_4[/tex] is
[tex]M=\dfrac{0.002724642}{25\times 10^{-3}}\\\Rightarrow M=0.10898568\approx 0.1090\ \text{M}[/tex]
The concentration of the unknown [tex]H_2SO_4[/tex] solution is [tex]0.1090\ \text{M}[/tex].
The number of calories listed on a food label always refers to the number in the entire package
How many units are in 1.54 moles?
Answer:
Every mole contains 6.022 x 10^23 atoms regardless of what type of moelcules it is (Gold, Silver). So the anwer is 1.54 times 6.022 x 10^2
How many molecules are in 20,484 grams of H2O?
Answer:
3.4027x10^-22
Explanation:
How much heat do you need to raise the temperature of 100 g of aluminum from 30°C to 150°C?
Answer:
Heat energy can be calculated by using the specific heat of a substance multiplying it to the mass of the sample and the
change in temperature. It is expressed as:
Energy = mCAT
Energy = 100 (0.90) (150 - 30)
Energy = 10800 J
Sulfur dioxide, SO2, is used in wine as an antioxidant, slowing the oxidation of ethanol
to ethanoic acid. To determine the SO2 content of a wine sample, sodium hydroxide
and sulfuric acid were added to ensure that all sulfur was present as SO2. A 20.00 mL
aliquot was then titrated against standardised iodine solution, using starch indicator.
Reaction occurred according to the equation:
SO2(aq) + 2H2O(l) + 12(aq) → 4H+ (aq) + 21- (aq) + SO42- (aq)
The end point was reached with 15.62 mL of 0.00501 M iodine solution. The
concentration (in M) of SO2 in the wine was ...
A)6.2 x 10-3
B)7.8 x 10-3
C)3.9 x 10-3
D)5.0 x 10-3
The concentration (in M) of SO₂ in the wine : c. 3.9 x 10⁻³
Further explanationGiven
Reaction
SO2(aq) + 2H2O(l) + I2(aq) → 4H+ (aq) + 21- (aq) + SO42- (aq)
Required
The concentration (in M) of SO2
Solution
Titration ⇒ mol SO₂ = mol iodine(I)
mol iodine :
=15.62 ml x 0.00501 M
=0.078256 mlmol
From equation, mol ratio of of SO₂ : I₂ = 1 : 1, so mol SO₂=0.078256
The concentration of SO₂(in 20 ml sample) :
M = n/V
M = 0.078256 mlmol/20 ml
M = 0.0039128
M = 3.9 x 10⁻³
Describe the atoms in matter as it changes from a gas to a liquid. ANSWER QUICK!! 90 POINTS IF ANSWER
Answer:
Clouds are water
Explanation:
When a gas gathers up into a cloud,the cloud starts to rain and water comes out of the cloud.
7. The root structures on peanut plants that restore soil nutrients and fix nitrogen
Answer:
Like other legumes, peanut plants improve the soil by adding nitrogen, even as they grow tasty, nutritious nuts for this season's harvest. But peanuts need help as they take nitrogen from the air and "fix" it into the soil via their root systems.
Explanation:
The shape of the SO4 molecule is
Answer:
sndnmxixixisijwiw
Explanation:
jeejndn jzjaisisp