Question

How
do you calculate the molar heat capacity of 30 moles of
methane

Answer #1

take 30 moles methane in calorimeter with known heat capacity.

heat the compound then temperature of calorimeter increase which indicates how much heat is released.

now heat gained by calorimeter = heat lost by methane.

mCdeltaT of calorimeter = mCdeltaT of methane.

we know mass of calorimeter and mass of methane.

we knoe change in temperature.

we know heat capacity of calorimeter.

we will find the heat capacity of methane for 30 moles by using above equation.

if we know for 30 moles we can find for 1 mole easily.

In order to convert heat capacity Cv to molar heat capacity
Cv,mol, what information do you need to have? Can you find this
information in the Atoms in Motion Program???

1. Suppose you have 3.350×1024 molecules of methane,
CH4 .
-How many moles of methane do you have? Four sig figs
-How many grams of methane do you have?
2. How many moles of carbon atoms are there in 7 moles of
propane?

The specific heat of water is 4.18 J/(g⋅∘C). Calculate the molar
heat capacity of water.

If
brass is 35% zinc and 65% copper by mass, calculate the molar heat
capacity of brass. ( Specific heat capacity of brass is 0.377
J/g.C)

Calculate the heat capacity of the calorimeter system using
equation 3 and the molar enthalpy of neutralization ΔHneut
(provided on p. 2).
Equation 3:
ΔHtransformation = −ΔHcalorimeter
=−CP,cal(Tf−Ti) (3)
ΔHneut: is −56.02 kJ per mole
Limiting reagent: 0.00112 moles of NaOH
Tf = 29.0 C
Ti = 22.50 C
Mass of dry calorimeter assembly: 6.36 g
Mass of calorimeter after HCl
added: 54.05 g
Mass of calorimeter with NaOH solution: 103.77 g

(a) The molar heat capacity of lead is 26.44 J K-1 mol-1. How
much energy must be supplied (by heating) to 100 g of lead to
increase it’s temperature by 10.0°C? (b) The molar heat capacity of
sodium is 28.24 J K-1 mol-1. What is its specific heat capacity?
(c) The specific heat capacity of copper is 0.384 J K-1 g-1. What
is its molar heat capacity?

The constant pressure molar heat capacity of cerium is given by
the following expression. Cerium is a metal (ie solid).
Cp = (14.014 + 1.929 x 10-2 T) J
K-1 mol-1?
(a) Calculate the value of ?H for heating 1 moles of cerium from
25.0 C to 125.0 C (note since Cp is dependent on T, you
have to integrate)
(b) Explain why Cp might depend on T.

1- The molar mass and molar heat capacity of aluminum is 27.0
g/mol and 24.3 J/(mol K), respectively. If a 27.0-g Al sample, at
300. K, absorbed 168 J of heat, what is its final temperature?
2- The molar mass and molar heat capacity of aluminum is 27.0
g/mol and 24.3 J/(mol K), respectively. If a 27.0-g Al sample, at
300. K, absorbed 152 J of heat, what is its final temperature?
3- 100. g water, at 20 C, and...

Iron has a molar heat of about 25 J mol-K. Calculate
the beat capacity of a block of iron whose volume is 1 m.
Compare the result
with that for the same volume of water. (The relative atomic mass
of iron is 55.845 and its density is 7.86 x 10 kg m)

How
do you find the moles of acid in buffer? And the moles of base
needed to reach buffer capacity?

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