What mass of benzene and nitrate acid is consumed to obtain 156 g of nitrobenzene?

We compose the reaction equation and arrange the coefficients:
C6H6 + HNO3 = C6H5NO2 + H2O.
1) Find the molar mass of nitrobenzene: 12 * 6 + 1 * 5 + 14 + 2 * 16 = 123.
2) The amount of nitrobenzene substance: 156/123 = 1.3 mol.
3) According to the reaction equation, the quantities of nitrobenzene, nitric acid and benzene are 1: 1: 1. This means that the quantities of nitric acid and benzene are 1.3 mol.
4) The molar mass of benzene: 12 * 3 + 1 * 6 = 78.
5) The mass of benzene: 78 * 1.3 = 101.4 g.
6) Molar mass of nitric acid: 1 + 14 + 48 = 63.
7) Mass of nitric acid: 63 * 1.3 = 81.9 g.
Answer: The mass of benzene is 101.4 g, the mass of nitric acid is 81.9 g.