What is the mass of a sample of NH3 containing 7.20 x 10^24 molecules of NH3? 161 grams

187 grams

203 grams

214 grams

Which type of reaction always has an element and a compound as reactants

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure