How many hydrogen atoms are there in 3.50 grams of methane?

Question

Adrienne Wilkinson

Chemistry

2 May, 23:18

How many hydrogen atoms are there in 3.50 grams of methane?

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Answers (1)

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Papa · Answer 1

Answer is: there are 5,275·10²³ hydrogen atoms in methane.

m (CH₄) = 3,50 g.

n (CH₄) = m (CH₄) : M (CH₄).

n (CH₄) = 3,5 g : 16 g/mol.

n (CH₄) = 0,219 mol.

n (CH₄) : n (H) = 1 : 4.

n (H) = 4 · 0,219 mol = 0,876 mol.

N (H) = n (H) · Na.

N (H) = 0,876 mol · 6,022·10²³ 1/mol.

N (H) = 5,275·10²³.

Na - Avogadro number.