The air inside a bicycle tire pump has 27 joules of heat conducted away from while 77.9 joules of work done are being done on it

Question

elixir [45]

3 years ago

12

The air inside a bicycle tire pump has 27 joules of heat conducted away from while 77.9 joules of work done are being done on it

. What is the change in internal energy of the air

Chemistry

1 answer:

tatyana61 [14] · Answer 1 · 2022-02-20T16:59:41+03:00

Answer:

51 J

Explanation:

The air inside a bicycle tire pump has 27 joules of heat conducted away. By convention, when heat is released, it takes the negative sign, so Q = -27 J.

77.9 joules of work done are being done on the air inside a bicycle tire pump. By convention, when work is being done on the system, it takes the positive sign, so W = 77.9 J

We can calculate the change in the internal energy (ΔU) using the following expression.

ΔU = Q + W

ΔU = (-27 J) + 77.9 J

ΔU = 51 J