Find the amount of matter and the mass of 2.4 10 ^ 23 oxygen molecules.

univerkov | September 30, 2021 | education

Given:
N (O2) = 2.4 * 10 ^ 23

Find:
n (O2) -?
m (O2) -?

1) n (O2) = N (O2) / NA = 2.4 * 10 ^ 23 / 6.02 * 10 ^ 23 = 0.4 mol;
2) M (O2) = Mr (O2) = Ar (O) * N (O) = 16 * 2 = 32 g / mol;
3) m (O2) = n (O2) * M (O2) = 0.4 * 32 = 12.8 g.

Answer: The amount of substance O2 is 0.4 mol; weight – 12.8 g.

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