Answer:
[tex]\Delta S=900\frac{J}{K}[/tex]
Explanation:
Hello!
In this case, since the information is not missing, the following one will be used as it is found on similar problems:
[tex]\Delta h=26.7kJ/mol\\T_b=34.6\°C\\m=769.0g[/tex]
In such a way, we use the following equation to compute the entropy:
[tex]\Delta S=\frac{n\Delta h}{T_b}[/tex]
Whereas n (moles) are computed by using its molar mass (74.14 g/mol) as follows:
[tex]n=769.0g*\frac{1mol}{74.14g}=10.4mol[/tex]
[tex]\Delta S=\frac{10.4mol*26.7\frac{kJ}{ml} }{(34.6+273.15)K}\\\\\Delta S=0.900 \frac{kJ}{K} \\\\\Delta S=900\frac{J}{K}[/tex]
Best regards!
Calculate the amount of heat, in Joules, needed to raise 34.0g of water from 55.0°C to 76.0*C. The specific heat of water is 4.18 J/gºC.
Answer:
2984.52J
Explanation:
Using the formula: Q = m × c × ∆T
Where;
Q = amount of heat (in Joules)
m = mass (in grams)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
Based on the information provided in the question;
m = 34.0g
c = 4.18 J/gºC.
Initial temperature = 55.0°C
Final temperature = 76.0°C
Hence, Q = m × c × ∆T
Q = 34 × 4.18 × (76 - 55)
Q = 142.12 × 21
Q = 2984.52J
Therefore, 2984.52J is the amount of heat, in Joules, needed to raise 34.0g of the water.
500 grams of an unknown substance gains 23000 J of heat as it is heated from a temperature of 250C to 1250C. Using mathematical computation and the chart below, determine the identity of the unknown substance.
Answer:
The given substance is cast iron.
Explanation:
Given data:
Mass of substance = 50 g
Heat absorbed = 23000 J
Initial temperature = 250°C
Final temperature = 1250°C
Which metal is this = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 1250°C - 250°C
ΔT = 1000°C
23000 j = 50 g ×c ×1000 °C
23000 J = 50,000 g. °C×c
c = 23000 J /50,000 g. °C
c = 0.46 J/g.°C
The given substance is cast iron.
7. A. How many moles of Calcium hydroxide (CaOH2) are needed to completely react with 14.5 mol of Phosphoric acid (H3PO4)?
2 H3PO4 + 3 Ca(OH)2 → 6 H(OH) + Ca3(PO4)2
a. How many moles of water (HOH) will be produced?
b. How many moles of Calcium Phosphate (CaOH2) will be produced?
Answer:
moles of calcium hydroxide= 21.75 mol
a) 43.5 mol
b) 7.25 mol
Explanation:
Please see the attached picture for the full solution.
whats the reason you can float a paperclip on water?
Answer:
because it is not a rock and it is not thick so it can float
Explanation:
because it is thin and light
4. For the reaction A + 2B → C, the rate law is
Δ[C]/ΔT = k[A]²[B]
What are the units of the rate constant where time is measured in seconds?
a. 1/ M · s
b. 1/ M² · s
c. 1/ s
d. M²/ s
e. M/ s
The rate constant : b. 1/ M² · s
Further explanationThe reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.
For A + B ---> C + D
Can be formulated:
[tex]\large{\boxed{\boxed{\bold{v~=~k.[A]^a[B]^b}}}[/tex]
where
v = reaction speed, M / s
k = constant, mol¹⁻⁽ᵃ⁺ᵇ⁾. L⁽ᵃ⁺ᵇ⁾⁻¹. S⁻¹
a = reaction order to A
b = reaction order to B
[A] = [B] = concentration of substances
Units of the rate constant - k depend on rate law, so it is unique for the specific reaction
So for the rate law :
Δ[C]/ΔT = k[A]²[B] , the units are :
[tex]\tt \dfrac{M}{s}=k\times M^2\times M\\\\k=\dfrac{M/s}{M^2\times M}\\\\k=\dfrac{1}{M^2.s}[/tex]
Webb is testing samples of different elements. One sample is a dull, yellow solid that
breaks into powdery pieces when he hits it with a hammer. How should Webb classify
the yellow solid?
As a metal
As a nonmetal
As a gas
As a metalloid
Answer: it's nonmetal
Explanation: Sulfur has characteristics of nonmetals. It does not have luster, it cannot conduct electricity, and it is brittle. On the periodic table, sulfur is in group 16/VIA, in the third period. The group is called the oxygen group or the chalcogens.
Answer:
i dont know
Explanation:
8. What energy transformations take place in a simple electric motor?
D. light --> electrical
B. kinetic --> electric
A. chemical => solar
C. electrical -> kinetic
Answer:
I don't know
Explanation:
just wanna talk because I am getting bored.
Answer:
B)
takes mechanical energy and makes it electrical
Explanation:
21.4 L of gas at 42.3 °C and 681 mm Hg are heated to 221 °C, and the pressure is changed to 248 mm Hg. What is the new volume?
Answer:
V₂ = 90.42 L
Explanation:
Given data:
Initial volume = 21.4 L
Initial pressure = 681 mmHg (681/760=0.89 atm)
Initial temperature = 42.3 °C (42.3 +273 = 315.3 K)
Final temperature = 221°C (221+273 = 494 K)
Final volume = ?
Final pressure = 248 mmHg(248/760 =0.33 atm)
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
P₁V₁/T₁ = P₂V₂/T₂
V₂ = P₁V₁T₂/T₁P₂
V₂ = 0.89 atm × 21.4 L × 494 K / 315.3 K × 0.33 atm
V₂ = 9408.72 L /104.05
V₂ = 90.42 L
Which is a method that can be used to separate the components of a solution?
magnetic separation
decantation
filtration
distillation
Answer:
distillation
Explanation:
i did the assignment
Answer:
distillation
Explanation:
When is my dad going to get the milk?
Answer:
joe.......
Explanation:
mama......
Which of these organisms can move on its own?
A oak tree
B anteater
C dolphin
D all of the above
True or False: The polar zones on Earth are near the equator
it is for sure sure false
Answer:
False they are on the extremes of the earth they are poles they are so cold the temp is freezing there and near the equator it would hot
Each of the structures for CIOCI, NCOH, and CINO has atoms connected in the order given in their formulas. Identify the type of hybridization for the central atom in each compound. Write the appropriate items to their respective bins.
a. nitrogen in CINO
b. oxygen in CIOCI
c. carbon in NCOH
1. sp
2 sp2
3. sp3
Answer:
see explanation
Explanation:
If we look at the structures of each of the compounds we can be able to deduce the accurate hybridization of each of the atoms listed.
Looking at ClNO - we can see that the nitrogen atom is linked to oxygen by a double bond and linked to chlorine by a single bond retaining a lone pair on nitrogen. Hence the nitrogen is in sp2 hybridized state.
For ClOCl, the compound has a sp3 hybridized oxygen atom linked to two chlorine atoms as expected retaining two lone pairs on oxygen.
For NCOH, the carbon atom is doubly bonded to oxygen hence it is sp2 hybridized.
Answer:
A) Label 2 (Sp2)
B) Label 3 (Sp3)
C) Label 1 (Sp)
Explanation:
A) Have 7 Lone Pairs (LP) to place. 1 on N. 1 becomes a double bond. Double bonds count as 1 Electron Group. Same for single bond and LP. Add these to get 3. 3 coresponds for SP2
B) 8LP. 2LP on O. 2 bonds to O. Add to get 4. 4-> Sp3
C) 5LP. C O bond is double. single bond to N. Add to get 2-> Sp
Which is one factor that scientists use to classify orders of soil?
Answer:
The scientist classify the types of soil based on the texture of the soil, the type of Rock from which they are formed and the type of organisms which live in the soil. For example red soil is formed by the weathering of reddish type of Rock which is found in that territory.
Explanation: google and me.....hope this helps
One factor which scientists used to classify orders of is Soil texture
Soil textureSoil texture is a classification strategy that scientists used to determine soil classes orders based on their physical texture.
Soil texture and soil structure are unique properties of the soil that will have a great effect on the behavior of soils, such as water holding capacity, nutrient retention and supply, drainage, and nutrient leaching.
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To everyone who has exams today, I WISH YALL THE BEST OF LUCK!!!!
ありがとう私は本当にこの励ましが必要でした :)
You have 0.672 L of 4.78 M aqueous AlCl3 solution in a glass. If you gently heat the solution until only 0.380 L is left, what is the new molarity of the AlCl3 solution?
Answer:
8.45 M
Explanation:
To solve this problem we need to keep in mind the definition of molarity:
Molarity = moles / volumeFirst we calculate the moles of AlCl₃ in 0.672 L of a 4.78 M solution:
Moles = Molarity * volumeMoles = 4.78 M * 0.672 L Moles = 3.212 molesThen we calculate the new molarity of the AlCl₃ solution using that number of moles, which remains the same throughout the evaporation process:
New Molarity = 3.212 moles / 0.380 LNew Molarity = 8.45 MWhat mass of lithium phosphate (Li3PO4) is needed to prepare 500 mL (0.500 L) of a solution having a lithium ion concentration of 0.125 M?
a. 2.41 g
b. 6.75 g
c. 10.1 g
d. 19.3 g
e. 30.4 g
Answer:
a. 2.41 g
Explanation:
First we calculate the number of lithium ion moles (Li⁺) in the solution, multiplying the concentration times the volume:
500 mL ⇒ 500 / 1000 = 0.500 L
0.125 M * 0.500 L = 0.0625 mol Li⁺Then we convert moles of Li⁺ to moles of Li₃PO₄, keeping in mind that for each mole of Li₃PO₄ there are 3 Li⁺ moles:
0.0625 mol Li⁺ * [tex]\frac{1molLi_3PO_4}{3molLi^{+}}[/tex]= 0.02083 mol Li₃PO₄Finally we convert Li₃PO₄ moles to grams, using its molar mass:
0.02083 mol Li₃PO₄ * 115.79 g/mol = 2.41 gThe mass of lithium phosphate, Li₃PO₄ required to prepare the solution is 2.41 g
The correct answer to the question is Option A. 2.41 g
We'll begin by calculating the concentration of Li₃PO₄. This can be obtained as follow:
Li₃PO₄(aq) —> 3Li⁺(aq) + PO₄³¯(aq)
From the balanced equation above,
3 moles of Li⁺ is present in 1 mole of Li₃PO₄.
Therefore,
0.125 M Li⁺ will be present in = 0.125 / 3 = 0.0417 M Li₃PO₄.
Thus, the concentration of Li₃PO₄ is 0.0417 M
Next, we shall determine the number of mole of Li₃PO₄ in the solution.Molarity of Li₃PO₄ = 0.0417 M
Volume = 0.5 L
Mole of Li₃PO₄ =?Mole = Molarity x Volume
Mole of Li₃PO₄ = 0.0417 × 0.5
Mole of Li₃PO₄ = 0.02085 moleFinally, we shall determine the mass of Li₃PO₄ required to prepare the solution.Mole of Li₃PO₄ = 0.02085 mole
Molar mass of Li₃PO₄ = (3×7) + 31 + (16×4) = 116 g/mol
Mass of Li₃PO₄ =?Mass = mole × molar mass
Mass of Li₃PO₄ = 0.02085 × 116
Mass of Li₃PO₄ = 2.41 gThus, the mass of Li₃PO₄ required to prepare the solution is 2.41 g
The correct answer to the question is Option A. 2.41 g
Learn more: https://brainly.com/question/3126258
help me pleaseeeeee
Answer:
Arthropod (3)
Annelids (2)
Cnidarians (1)
Echinoderms (4)
Explanations:
I hope all this helps if u don't understand it let me know.
Two descriptions about physical quantities are given below:
Quantity A: It is a force.
Quantity B: It changes when the object travels from Earth to Earth's moon.
What quantities are these most likely describing?
Select one:
a. Both Quantity A and Quantity B are mass.
b. Both Quantity A and Quantity B are weight.
c. Quantity A is weight and Quantity B is mass.
d. Quantity A is mass and Quantity B is weight.
Answer:
[tex]\huge\boxed{\sf Option \ B}[/tex]
Explanation:
=> Weight is an attractive force which is exerted on any body.
=> It changes when the object's place changes as it depends upon the acceleration due to gravity ( g = 9.8 m/s ) which changes as we move from place to place.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807Which structure vibrates the hammer?
stirrup
ear canal
eardrum
anvil
Answer:
Yes, the correct answer is C) Ear Canal
Explanation:
What is the definition of electron configuration. and thanks
Answer:
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below
Explanation: welcome
Which is a component of John Dalton’s atomic theory?
The ratio of atoms in a compound is fixed.
The atoms of different elements are the same.
An atom is a small particle of matter that can be broken down.
A reaction can create or destroy atoms as well as rearrange them.
Answer:
i think the answer is b
Explanation:
Which of the following is an example of potential energy? O A. The energy of vibrating air O B. The energy of moving particles O C. The energy in chemical bonds OD. The energy of a runner on a flat road
D
Explanation:
i hope so it is the answer
Heat energy always moves in which direction?
Group of answer choices
Large objects to small objects
Dark objects to light objects
Warm objects to cool objects
Smooth objects to rough objects
Answer:
large object to small objects
Answer:
The answer is C or warm objects to cool objects
Explanation:
Heat is the thermal energy flows from one substance to another when the substances differ in temperature. When you drink hot chocolate the heat from the liquid will flow to your mouth.
Which is associated with low humidity? *
dry air
warm air
rainforest
coastal area
Answer:
A: dry air
Explanation:
Trust me this is right, I’m doing the exam rn and if its not right I will come back and edit this.
Answer:
guy above me is right
Explanation:
100% on quiz
10. Electromagnetic waves used to examine broken bones inside the body are called
The answer to your question are X-Rays.
We use this all the time when we have broken bones in our skeletal system!
Answer:
it would be x-rays
Explanation:
Andesitic rock is an igneous rock with a composition in between that of basaltic and granitic igneous rock.
true or false
Answer:
Explanation:
intristing
500.0 liters of a gas are prepared at 700 mm Hg and 200 C. The gas is placed into a tank under high pressure. What is the volume of the gas?
Answer: 143*tank temperature/tank pressure L
Explanation: too few data. Need to know the pressure and what if any, temperature change.
tank volume = (tank temp/tank pressure)*(500*200/700) = 143*tank temp/tank pressure L
At constant temperature, (500*700)/tank temp
e.g. at 1400mm Hg, 500*700/1400 = 250L
Which substances are componds
Answer:
Water - Formula: H2O = Hydrogen2 + Oxygen. ...
Hydrogen Peroxide - Formula: H2O2 = Hydrogen2 + Oxygen2 ...
Salt - Formula: NaCl = Sodium + Chlorine. ...
Baking Soda - Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3 .
Octane - Formula: C8H18 = Carbon8 + Hydrogen18
are 5 examples
Explanation:
The cell membrane around a cell forms a barrier that protects and regulates the cell. Certain chemicals can pass through the plasma membrane because they have similar chemical properties as the membrane.
Which best describes those that can pass through?
They are concentrated.
They are soluble.
They are diluted.
They are heated.
Answer:
it is b (they are soluble)
Explanation:
got it right on edg and on quizlet
Answer:
B. They are soluble
Explanation: