Question

If phosphorus reacts with oxygen to produce diphosphorous pentoxide, how many grams of oxygen are needed to produce 27 grams of product?

If zinc reacts with hydrobromic acid to produce hydrogen gas and zinc(II) bromide, how many grams of zinc must react in order to produce 5.9 grams of hydrogen?

Aqueous sodium phosphate reacts with aqueous iron(II) chloride to produce iron(II) phosphate as a precipitate (sodium chloride is the other product). What is the theoretical yield of iron (II) phosphate, in grams, if 9.7g of sodium phosphate is reacted in this manner

Nitrogen reacts with hydrogen to give ammonia. How many grams of nitrogen are needed to form 27.3g of ammonia?

How many grams of water are produced when 11.4 grams of oxygen reacts (by burning) with C6H14?

Answer 1

1)

4 P +   5 O2 -----------------------> 2 P2O5

              160g                           284 g

                ?                                  27g

mass of O2 = 160 x 27 / 284

                  = 15.2

O2 mass needed = 15.2 g