Calculate the mass of hydrazine (n2h4) that contains a billion (1.000 x 10^9) hydrogen atoms.
be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

1.3285 × 10⁻¹⁴ g of hydrazine

Explanation:

if         32 g of hydrizine (1 mole) contains 4 × 6.022  × 10²³ hydrogen atoms

then     X g of hydrizine contains 1 × 10⁹ hydrogen atoms

X = (32 × 1 × 10⁹) / (4 × 6.022  × 10²³)

X = 1.3285 × 10⁻¹⁴ g of hydrazine

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c) should be the answer.