1. A 0.392 kg piece of zinc is removed from an oven and plunged into 0.399 kg of water in an insulated container. The temperature of the water increases from 26.0 C to 87.0 C. If the specific heat capacity of zinc is 0.387 J g¹ C¹, what must have been the original temperature of the zinc, in C?

The specific heat capacity of water is 4.184 J g¹ C¹.

Give your answer accurate to 3 significant figures. Enter only numbers in your answer. Do not include units. Enter 1.2310⁴ as 1.23E4.

2.

What is w when the volume of a gas expands from 16.7 L to 22.2 L against a constant external pressure of 749 Torr? Remember to include a "+" or "" sign as appropriate.

Note: 760 Torr = 1 atm = 1.01325 bar = 101.325 kPa

Enter your answer in acceptable SI units, accurate to 3 significant figures. Use an acceptable SI symbol for units.