Question

6.5g zinc react with dilute sulphuric acid then hydrogen gas evolved calculate the weight of oxygen gas which will combine completely with hydrogen obtained hydrogen (Zn=65,S=32,O=16)
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Answer 1

Answer:

Zn+2HCl→ZnCl

2

+H

2

Molar mass of Zn= 65.4 g/mol

thus 65.4 g of zinc liberates 1 mol i.e. 22.4 L hydrogen gas at STP

32.65 g of zinc will liberate:

65.4

22.4

×32.65=11.18L of hydrogen gas at STP

Explanation:

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