We give 70 j as heat to a diatomic gas, which then expands at constant pressure. the gas molecules rotate but do not oscillate. by how much does the internal energy of the gas increase?

50 Joule

Explanation:

Diatomic gas

Q = Heat given = 70 J

n = number of moles

Cp = specific heat at constant pressure

ΔT = Change in temperature

R = Gas constant  

Change in energy

ΔE = Q-w

⇒ΔE = n(Cp)ΔT-nRΔT

As it is a diatomic gas Cp = (7/2)R

Putting the value of Cp in the above equation we get

Q = (7/2)RΔT

ΔE = (5/2)RΔT

Dividing the equations we get

ΔE/Q = 5/7

⇒ΔE = (5/7)Q

⇒ΔE = (5/7)×70

⇒ΔE = 50 J

∴ The internal energy change is 50 Joule

50

Explanation:

I took the test and got it right

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

the answer is d. 74.02