Calculate how many grams of phosphorus is contained in 0.1 mol of ammonium hydrogen phosphate.

Let’s write down the formula of ammonium hydrogen phosphate: (NH4) 2HPO4 or N2H9PO4.

After analyzing the formula of the compound, we can conclude that 1 mol of ammonium hydrogen phosphate contains 2 mol of nitrogen, 9 mol of hydrogen, 1 mol of phosphorus and 4 mol of oxygen.

n (P) = 1 mol.

Find the mass of phosphorus in 1 mole of ammonium hydrogen phosphate.

m (P) = n * M = 1 * 31 = 31 g.

Let’s make a proportion and find how many g of phosphorus is contained in 0.1 mol of ammonium hydrogen phosphate.

1 mol – 31 g

0.1 mol – x

x = 31 * 0.1 = 3.1 g

Thus, 0.1 mol of ammonium hydrogen phosphate contains 3.1 g of phosphorus.