To detect the leakage of natural gas (it is almost odorless), an odorous substance called an odorant is added to it.

To detect the leakage of natural gas (it is almost odorless), an odorous substance called an odorant is added to it. The odorization rate is 16 g per 1000 m3 of natural gas. Estimate the number of odorant molecules in 1 m3 of air if the mass of one odorant molecule is 10-22 g.

In order to find the number of gas molecules, it is necessary to divide the mass of the gas by the mass of one molecule. (Weights should be expressed in the same units, in this case in grams). In a specific example, we get:
N = 16: 10 ^ -22 = (16/10) * 10 ^ 21 = 1.6 * 10 ^ 21.