Specific Heat Capacity of a Gas

IMPORTANT

Specific Heat Capacity of a Gas: Overview

This Topic covers sub-topics such as Mayer's Relation, Molar Specific Heat Capacity at Constant Pressure, Molar Specific Heat Capacity at Constant Volume and, Principal Specific Heat Capacity of a Gas at Constant Pressure

Important Questions on Specific Heat Capacity of a Gas

EASY
IMPORTANT

The specific heat of a substance i.e at constant pressure is defined as the rate of change of _____ with respect to ______

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Specific heat of a substance at constant volume is a property of the system.

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Heat transferred at constant ________ increases the ______ of a system.

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The specific heat of a substance at constant volume is defined as the rate of change of _______ with respect to ______

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If SP and SV denote the specific heats of nitrogen gas per unit mass at constant pressure and constant volume respectively, then

HARD
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One gram mole of an ideal gas A with the ratio of constant pressure and constant volume specific heats γA=53 is mixed with n gram moles of another ideal gas B with γB=75. If the γ for the mixture is 1913, then what will be the value of n?

HARD
IMPORTANT

A thermally insulated piece of metal is heated under atmosphere by an electric current so that it receives electric energy at a constant power P. This leads to an increase of the absolute temperature T of the metal with time t as follows

T=at14

Then the heat capacity Cp is

EASY
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Heat required to raise the temperature of 1 mole of a substance by 1° is called

MEDIUM
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The value of molar specific heat at constant pressure for one mole of triatomic gas (triangular arrangement) at temperature T K is (R is the universal gas constant)

MEDIUM
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70 cal of heat is required to raise the temperature of 2 moles of an ideal gas from 30 to 35 while the pressure of the gas is kept constant. The amount of the heat required to raise the temperature of the same gas through the same temperature range at constant volume is (gas constant R=2 cal mol-1-K-1)

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A vessel contains helium, which expands at constant pressure when 15 kJ of heat is supplied to it. What is the work performed in the expansion?

MEDIUM
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Four moles of hydrogen, 2 moles of helium and 1 mole of water vapour form an ideal gas mixture. What is the molar specific heat at constant pressure of mixture?

MEDIUM
IMPORTANT

310 J of heat is required to raise the temperature of 2 moles of an ideal gas at constant pressure from 25 to 35. The amount of heat required to raise the temperature of the gas through the same range at constant volume is

HARD
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10 mole of an ideal gas is heated at a constant pressure of one atmosphere from 27°C to 127°C. If Cv, m=21.686+10-3 T, then what will be Δ H for the process?

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For three gases (assume ideal); oxygen, nitrogen and carbon dioxide, (Cp - Cv) will be

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The molar heat capacity of oxygen gas at STP is nearly 2.5R. As the temperature is increased, it gradually increases and approaches 3.5 R. The most appropriate reason for this behaviour is that at high temperature 

HARD
IMPORTANT

ΔCp for a reaction is 2.0+0.2 T cal g-1. Its enthalpy of reaction at 10 K is -14.2 kcal mol-1. Its enthalpy of reaction at 100 K in kcal mol-1 will be

EASY
IMPORTANT

70 cal of heat is required to raise the temperature of  2 moles of an ideal diatomic gas at constant pressure from 30°C to 35°C. The amount of heat required (in calorie) to raise the temperature of the same gas through the same range (30°C to 35°C) at constant volume is

HARD
IMPORTANT

25.0 mL of 1.0 M HCl is combined with 35.0 mL of 0.5 M NaOH. The initial temperatures of the solutions is 25C, the density of the solution is 1.0 g/mL, the specific heat capacity of the solution is 4.184 J/gC, the reaction is completed in an insulated coffee cup, and the standard enthalpy of reaction for H+ aq+OH- aqH2O l is -56 kJ/mol. What is the final temperature of the solution?