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29/09/2020 4:29 pm
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The weight of NaCl decomposed by 4.9g of H2SO4, if 6 g of sodium hydrogen sulphate and 1.825 g of HCl, were produced in the reaction is:
(a) 6.921 g
(b) 4.65 g
(c) 2.925 g
(d) 1.4 g
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29/09/2020 7:55 pm
(c) 2.925 g
Explanation:
NaCl (xg) + H2SO4(4.9 g) → NaHSO4 (6g)+ HCl(1.825 g)
According to law of conservation of mass "mass is neither created nor destroyed during a chemical change"
∴ Mass of the reactants = Mass of products
x + 4.9 = 6 + 1.825
or x = 2.925g