Calculate how many grams of iron can be made from 16.5 grams of iron(III) oxide if hydrogen gas is in excess.
How many grams of oxygen are needed to react with 56.8 grams of ammonia?
If 10.0 grams of aluminum sulfite is reacted with 10.0 grams of sodium hydroxide, determine the limiting reagent.
When 25.4 grams of aluminum oxide is reacted with 10.2 grams of iron in a lab, the resulting mass of aluminum is 3.20 grams. What would be the percentage yield?
in each case, write the balanced equation, and convert all the grams to moles.
The equation will tell you how many moles are involved.
Then convert back to grams, if needed.
For example,
4NH3 + 5O2 → 4NO + 6H2O
58.6g = 3.44 moles
Since it takes 5 moles of O2 to react with 4 moles of NH3, you will need
5/4 * 3.44 = 4.30 moles = 77.42 g of O2