A sample of gas is collected at 306. K and 740. mm of Hg has a mass of
.390 grams and a volume of 350. mL. What is its molar mass? (Hint:
convert units)

A. 25.8 g/mol
B. 78.9 g/mol
C. 28.8 g/mol
D. 45.8 g/mol

A155.0 9 piece of copper at 182 °c is dropped into 2500 g of water at 23.9 °c. (the specific heat of copper is 0.385 1/9°c.) calculate the final temperature of the mixture. (assume no heat loss to the surroundings.)