Answer to Question #147789 in General Chemistry for jaylin

Question

How many grams of mercuric chloride must react to give 5.81 g of Hg?
Co(s)+HgCl2(aq)→CoCl3(aq)+Hg(l)
Express your answer with the appropriate units.

Answer 1

Balanced equation : 2Co + 3HgCl₂ → 2CoCl₃ + 3Hg

3 moles of mercuric chloride = 3 moles of Hg

3 ( 271.6g) mercurial chloride = 3 (200.6)g Hg

1g Hg= 3 × 271.6 /(3×200.6)g mercuric chloride

5.81g Hg = 3 ×271.6 ×5.81/(3×200.6)g mercuric chloride

= 7.87g mercuric chloride