Consider the reaction between nis2 and o2: 2nis2 (s) + 5o2 (g) →2nio (s) + 4so2 (g) when 11.2 g of nis2 are allowed to react with 5.43 g of o2, 4.89 g of nio are obtained.

Question

Chemistry

Hancock

6 October, 04:45

Consider the reaction between nis2 and o2: 2nis2 (s) + 5o2 (g) →2nio (s) + 4so2 (g) when 11.2 g of nis2 are allowed to react with 5.43 g of o2, 4.89 g of nio are obtained.

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Erin Gonzalez · Answer 1

M (NiS₂) = 11.2 g.

n (NiS₂) = m (NiS₂) : M (NiS₂).

n (NiS₂) = 11.2 g : 122.8 g/mol.

n (NiS₂) = 0.091 mol.

m (O₂) = 5.43 g.

n (O₂) = 5.43 g : 32 g/mol.

n (O₂) = 0.17 mol; limiting reactant.

From chemical reaction: n (NiS₂) : n (O₂) = 2 : 5.

0.091 mol : n (O₂) = 2 : 5.

n (O₂) = 0.2275 mol, not enough.

n (NiO) = 4.89 g.

n (O₂) : n (NiS) = 5 : 2.

n (NiS) = 0.068 mol.

m (NiS) = 0.068 mol · 74.7 g/mol = 5.08 g.

percent yield = 4.89 g / 5.08 g · 100% = 96.2%.