Determine the mass of hydrogen required to obtain 1.8×10 ^ 24 water molecules

univerkov | August 9, 2021 | education

Given:

N (H2O) = 1.8 * 10 ^ 24

To find:

m (H2) -?

Solution:

1) 2 H2 + O2 => 2H2O;

2) n (H2O) = N (H2O) / NA = 1.8 * 10 ^ 24 / 6.02 * 10 ^ 23 = 2.99 mol;

3) n (H2) = n (H2O) = 2.99 mol;

4) m (H2) = n * M = 2.99 * 2 = 5.98 g.

Answer: The mass of H2 is 5.98 g.

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