How many grams of hydrogen gas are produced when 4.6 g of sodium reacts completely with water (Na = 23, H = 1)?
Correct answer D. 0.2 g
Explanation
4.6 g Na is 0.2 mol. From 2Na + 2H₂O → 2NaOH + H₂, 0.2 mol Na gives 0.1 mol H₂, which is 0.1 × 2 = 0.2 g.
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