If 152 grams of ethane (c2h6) are reacted with 231 grams of oxygen gas, what is the mass of the excess reactant leftover after the reaction has reached completion? 2c2h6 (g) + 7o2 (g) → 4co2 (g) + 6h2o (g)

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Chemistry

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28 April, 16:15

If 152 grams of ethane (c2h6) are reacted with 231 grams of oxygen gas, what is the mass of the excess reactant leftover after the reaction has reached completion? 2c2h6 (g) + 7o2 (g) → 4co2 (g) + 6h2o (g)

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Kellen Clay · Answer 1

Answer is: the mass of the excess reactant (ethane) leftover is 90.135 grams.

Chemical reaction: 2C₂H₆ (g) + 7O₂ (g) → 4CO₂ (g) + 6H₂O (g).

m (C₂H₆) = 152 g.

n (C₂H₆) = m (C₂H₆) : M (C₂H₆).

n (C₂H₆) = 152 g : 30 g/mol.

n (C₂H₆) = 5.067 mol.

m (O₂) = 231 g.

n (O₂) = 231 g : 32 g/mol.

n (O₂) = 7.218 mol; limiting reactant.

From chemical reaction: n (O₂) : n (C₂H₆) = 7 : 2.

n (C₂H₆) = 2 · 7.218 mol : 7.

n (C₂H₆) = 2.0625mol.

Δn (C₂H₆) = 5.067 mol - 2.0625 mol.

Δn (C₂H₆) = 3.0045 mol.

Δm (C₂H₆) = 3.0045 mol · 30 g/mol = 90.135 g.