Find the number of molecules and the mass of 0.5 mol of hydrogen

univerkov | June 25, 2021 | education

Given:
n (H2) = 0.5 mol

To find:
N (H2) -?
m (H2) -?

1) N (H2) = n (H2) * NA = 0.5 * 6.02 * 10 ^ 23 = 3.01 * 10 ^ 23;
2) M (H2) = Mr (H2) = Ar (H) * N (H) = 1 * 2 = 2 g / mol;
3) m (H2) = n (H2) * M (H2) = 0.5 * 2 = 1 g.

Answer: The number of H2 molecules is 3.01 * 10 ^ 23; weight – 1 g.

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