How many molecules are there in 16 g of SO2? Mr (SO2) = 64

m (SO2) = 16 g.

Let’s determine the number of sulfur oxide molecules. We write down the solution.

We use the following formula.

N = n * Na.

Where N is the number of molecules.

n is the amount of substance.

Na is Avogardo’s number, a constant equal to 6.02 * 10’23 molecules.

First, we find the amount of substance.

M (SO2) = 32 + 16 * 2 = 64 g / mol.

n = m / M.

n = 16 g / 64 g / mol = 0.25 mol.

N = 0.25 * 6.02 * 10’23 = 1.505 * 10’23 molecules.

This means that the number of sulfur oxide molecules is 1.505 * 10’23 molecules.

Answer: N = 1.505 * 10’23 molecules.