Question

Calcium carbide, CaCz, reacts with water to form ethyne, C2H2, and calcium hydroxide. The equation for the reaction is shown. CaCz(s) + 2H2O() - C2H2(g) + Ca(OH)2(s) 1 → Which volume of ethyne is produced when 6 g of water react completely with calcium carbide? A 4 dm3 B 8 dm3 C 36 dm3 D 72 dm3​

Answer 1

Answer:

First let’s start with terminology. C2H2 is not Ethylene, it is Acetylene.

now for calculation: water mol. mass is 18; C2H2 mol mass is 30

CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH) 2(s)

2 mols of water will yield one mol of Acetylene, hence 36g water gives 30g Acetylene, so 6g water will give 5g Ac.

now volume: 30g Ac. take a volume of 22.4 liters (at std. temp & Press.).

5g —-> (22.4/30)*5, or 22.4/6 liters (get you calculator out)

Explanation:

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