The air circulating in your laboratory is usually at 25.0°C and a relative humidity of 47.0%. You want to set up a cold room in the lab, but you do not want moisture condensing on the glassware in the cold room. At what temperature setting (in °C) would the humidity of the air just reach saturation and begin to condense on the glassware? Use 40.7 kJ/mol as the ∆Hvap of water.

1 A 25.0 g sample of quartz, which has a specific heat capacity of 0.730 JgC, is dropped into an insulated container containing 300.0 g of water at 75.0 °C and a constant pressure of 1 atm. The initial temperature of the quartz is 4.1 °C. Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has 3 significant digits. C 0 x10 X S

Two 20.0 g ice cubes at −15.0 ∘C−15.0⁢ ∘C are placed into 285 g285 g of water at 25.0 ∘C.25.0⁢ ∘C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, ?f,Tf, of the water after all the ice melts.

10. In which state (x) does a gram of water loses less heat to cool down to 20 °C? (1) at +40 °C or (1) at +50 °C (g with I) at +100 °C or (g) at +100 °C