Find the mass: a) 0.75 mol of nitrogen; b) 9 × 1023 molecules of glucose C6H12O6.

In this task, determine the mass in the given compounds.

1. Determine the mass of nitrogen.

n = m / M.

Determine the molar mass of nitrogen.

M (N2) = 14 * 2 = 28 g / mol.

m = n * M.

m = 0.75 mol * 28 g / mol = 21 g.

This means that the mass of nitrogen is 21 grams.

2. Determine the mass of glucose.

n = N / Na = 9 * 10 ^ 23 / 6.02 * 10 ^ 23 = 1.5 mol.

m = n * M.

Determine the molar mass of glucose.

M (C6H12O6) = 12 * 6 + 12 * 1 + 6 * 16 = 180 g / mol.

n = 180 g / mol * 1.5 mol = 270 g.

This means that the mass of glucose is 270 grams.