Question

The gas in a piston (defined as the system) is warmed and absorbs 655 J of heat. The expansion performs 348 J of work on the surroundings.

Part A What is the change in internal energy for the system? ΔE = J

A system releases 617 kJ of heat and does 145 kJ of work on the surroundings.

Part A What is the change in internal energy of the system? ΔE = kJ

A 31.2 g wafer of pure gold initially at 69.3 ∘C is submerged into 63.0 g of water at 27.7 ∘C in an insulated container.

Part A What is the final temperature of both substances at thermal equilibrium?

The specific heat capacities of gold and water are 0.128 and 4.18 J/(g ºC), respectively.

A silver block, initially at 57.9 ∘C, is submerged into 100.0 g of water at 24.1 ∘C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 27.9 ∘C.

Part A What is the mass of the silver block? The specific heat capacities of silver and water are 0.235 and 4.18 J/(g ºC), respectively.

m=?

A gas is compressed from an initial volume of 5.35 L to a final volume of 1.23 L by an external pressure of 1.00 atm. During the compression the gas releases 127 J of heat.

Part A What is the change in internal energy of the gas? Express your answer to three significant figures.

Answer 1

answer of last part ;- 290. kj