1. A sample of 0.12 g mixture containing aluminum reacts with HCl(aq), 125 mL hydrogen gas (H) produced is collected over water at 26 C and a barometric pressure of 755 mmHg. Vapor pressure of water at this temperature is 25.2 mmHg and only aluminum reacts in the mixture what is the percentage of aluminum in the mixture?

2 Al(s) + 6 HCl(aq) 2 AlCl(aq) + 3 H(g)

2. When an alloy containing 10 g aluminum (c = 0.900 J g K) and 30 g copper (c = 0.385 J g K) at 40 C is put to an isolated container containing 95 g of water at 85 C what is the final temperature of the system? (Assume that no heat is lost to the surroundings)

3. The vapor pressure of water at 25 C is 23.8 mmHg and normal boiling point is 100 C. As every 1 km increase in altitude causes a 10 torr decrease in atmospheric pressure, calculate the altitude as km where the boiling point of water is 97.6 C.

4. Flask A has a volume of 0.5 L and contains 50 g of a volatile liquid. Flask B has a volume of 1 L and contains 25 g of the same liquid. Both flasks are stoppered and both are at 30 C. What is the ratio of the vapor pressure of the liquid in Flask A to that in Flask B (PA:PB)?

5. According to VSEPR theory, predict the central atom having a molecular geometry of trigonal planar in methyl glycine molecule (NH-CH-CO-OH). Superscripts were given to prevent confusion.