Which is heavier than 3 × 10 ^ 23 ozone molecules or the same amount of oxygen. The answer is confirmed by calculations.

Given:
N (O3) = 3 * 10 ^ 23
N (O2) = 3 * 10 ^ 23
NA = 6.02 * 10 ^ 23 mol-1

To find:
m (O3)? m (O2)

Decision:
1) Calculate the amount of substance O3:
n (O3) = N (O3) / NA = 3 * 10 ^ 23 / 6.02 * 10 ^ 23 = 0.498 mol;
2) Calculate the mass of O3:
m (O3) = n (O3) * M (O3) = 0.498 * 48 = 23.9 g;
3) Calculate the amount of substance O2:
n (O2) = N (O2) / NA = 3 * 10 ^ 23 / 6.02 * 10 ^ 23 = 0.498 mol;
4) Calculate the mass of O2:
m (O2) = n (O2) * M (O2) = 0.498 * 32 = 15.9 g;
5) Compare the O3 and O2 masses:
m (O3)> m (O2).

Answer: The O3 sample is heavier than the O2 sample.