chemistry

1. Which gas (N2 and C2H2) diffuses more rapidly, and what is the relative rate of diffusion?

2. Ammonia is produced when 6.5 grams of hydrogen gas reacts with 5.1 grams of nitrogen gas at 725 mm Hg and 45.4 0C.

a. Write the balanced chemical equation.

b. Determine the limiting reactant and the theoretical yield of ammonia in moles.

c. Calculate the volume of ammonia.

3. Pure oxygen was first prepared by heating mercury (II) oxide:

How many liters of gas of O2 would be formed at 452 0C and 0.978 atm pressure by decomposition of 345 g of HgO?

4. A gaseous compound is 30.4% N and 69.6% oxygen by mass. A 5.25 gram sample of gas occupies 1.00 L and exerts a pressure of 1.26 atm at -4.0 0C.

a. What is the empirical formula?

b. What is the molecular formula?

5. Magnesium metal and hydrochloric acid are reacted to form magnesium chloride and hydrogen gas. 10.5 g magnesium metal is reacted with excess hydrochloric acid. What is the volume of hydrogen gas produced at standard temperature and pressure?