First slide

Chemical equations and calculations

Question

Which of the following statements is/are correct? Excess of H₂S(g) is bubbled into 1.0 L of 0.1 M CuCl₂solution.
${Cu}^{2 +} + H_{2} S (g) ⟶ CuS (s) + 2 H^{\oplus}$

Moderate

A

9.55 of CuS is produced
B

The concentration of $H^{\oplus}$ ions is 0.2 M
C

The concentration of $H^{\oplus}$ ions is 0.1 M.
D

95.5 g CuS is produced

Solution

Mol of ${Cu}^{2 +} = 1 .0 L \times 0 .1 M = 0 .1 mol {Cu}^{2 +} = 0 .1 \times 2 mol H^{\oplus}$
1. Weight of CuS = 0.1 x 95.5 = 9.55 g
2. Concentration of $H^{\oplus} = \frac{0.2 mol}{1.0 L} = 0.2 M$
(3) and (4) are wrong

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