Question

When a monoatomic gas expands at constant
pressure, the percentage of heat supplied that
increases temperature of the gas and in doing
external work in expansion at constant
pressure is

(with method please )

1) 100%, 0 %

2) 60%, 40%

3) 40%, 60%

4) 75%, 25%​

Answer 1

Answer:

the correct option is 2,60%,40%.

Explanation:

for an isobaric process,

pressure = constant

total heat supplied to system,

Q = nCp triangle T

degrees of freedom f for monoatomic gas = 3.

Cv=fr\2 = 3r\2.

Cp = CV + r = fr\2 + R = 5R\2.

Q = 5R triangle T\2.

heat needed to increase the temperature

= triangle U = nCv triangle T = 3R triangle T\2.

% heat to increase the temperature,

=triangle U\Q * 100 = 60.

heat required for expansion,

= w = p triangle v= nR triangle T.

% heat used for expansion,

= w\Q *100 = 40.

Answer 2

• 75%, and 25% increase temperature of the gas