Kinetic Theory Test

Result

Kinetic Theory Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Calculate the change in internal energy of 3.00 mol of helium gas when its temperature is increased by 2.00 K.

A
85.0 J

B
95.0 J

C
75.0 J

D
65.0 J

Solution

Helium is a monoatomic gas.(C_V= 1.5R)

change in internal energy

ΔU = nC_V Δ T = 3 × 1.5 × 8.31 × 2 = 75J
Question 2
1 / -0

One mole of hydrogen gas is heated at constant pressure from 300 K to 420 K. Calculate the energy transferred by heat to the gas

A
3.26 kJ

B
3.66 kJ

C
3.86 kJ

D
3.49 kJ

Solution

Hydrogen is a diatomic gas. (C_P= 3.5R)

energy transferred by heat to the gas

Q = nC_P Δ T = 1 × 3.5 × 8.31 × 120 = 3490J
Question 3
1 / -0

One mole of hydrogen gas is heated at constant pressure from 300 K to 420 K. Calculate the increase in its internal energy.

A
2.65 kJ

B
2.49 kJ

C
2.85 kJ

D
2.15 kJ

Solution

Hydrogen is a diatomic gas. (C_V= 2.5R)

Change in internal energy

ΔU = nC_VΔT = 1 × 2.5 × 8.31 × 120 = 2493J
Question 4
1 / -0

One mole of hydrogen gas is heated at constant pressure from 300 K to 420 K. Calculate the work done by the gas.

A
1.11 kJ

B
0.93 kJ

C
1.27 kJ

D
0.98kJ

Solution

In isobaric process

W = nR(T_F − T_I) = 1 × 8.31 × (420 − 300) = 0.98kJ