2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) From the equation above, calculate the mass of...

JAMB 2008

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.
[H = 1, O = 16, Na = 23]

A. 0.40g
B. 0.80g
C. 4.00g
D. 8.00g

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Correct Answer: Option C

Explanation

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Relative molecular mass of NaOH = 23 + 16 + 1 = 40smol-1
2 * 23g of sodium react with water to produce
2 * 40g of NaOH
∴ 2.3g of sodium will react with water to produce
(2.3 * 40 * 2)/(23 * 2) = 4.00g

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