- (E) Four grams of hydrogen gas at STP represent 2 mol of hydrogen since 2 g
is the gram-molecular mass of hydrogen. Each mole of a gas contains 6.02 ×
1023 molecules, so 2 mol contains 2 × 6.02 × 10^23 or 12.04 × 10^23 molecules.
marvins-underground-k-12
(Marvins-Underground-K-12)
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