Suppose 12.0 g of carbon (c) reacts with 70.0 g of sulfur (s) to give 76.0 g of the compound carbon disulfide 1 c s 2 2. In the process, all the carb

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Chemistry

Stitch

21 September, 10:27

Suppose 12.0 g of carbon (c) reacts with 70.0 g of sulfur (s) to give 76.0 g of the compound carbon disulfide 1 c s 2 2. In the process, all the carb

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Kassandra Pierce · Answer 1

Answer is: mass of unused sulfur is 5.87 grams.

Balanced chemical reaction: C + 2S → CS₂.

m (C) = 12.0 g; mass of carbon.

m (S) = 70.0 g; mass of sulfur.

n (C) = m (C) : M (C).

n (C) = 12 g : 12 g/mol.

n (C) = 1 mol; amount of substance.

n (S) = m (S) : M (S).

n (S) = 70 g : 32.065 g/mol.

n (S) = 2.183 mol.

From chemical reaction: n (C) : n₁ (S) = 1 : 2.

n₁ (S) = 1 mol · 2 = 2 mol.

Δn (S) = n (S) - n₁ (S).

Δn (S) = 2.183 mol - 2 mol.

Δn (S) = 0.183 mol; amount of unused sulfur.

Δm (S) = 0.183 mol · 32.065 g/mol.

Δm (S) = 5.87 g.