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Chemistry

Grade-9

Easy

Question

The amount of oxygen required to burn completely 570g of octane is:

1000 g
2000 g
3000 g
4000 g

hint Hint:

For one mole of octane 25/2 moles of oxygen is required.

The correct answer is: 2000 g

Octane reacts with oxygen to give carbon dioxide and water.
C₈H₁₈ + 25/2O₂ $rightwards arrow$ 8CO₂ + 9H₂O
For one mole of octane 25/2 moles of oxygen is required. For 114g of octane 400 g of oxygen is required to burn completely. Therefore, for 570g of octane 2000g of oxygen is required to burn completely.

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