How many grams of W are formed when 3.20 x 1022 molecules of WO3 react with excess H2? I need to know step by step because I suck at converting and need to understand.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.