One mole of butane= 58 g
2CH3CH2CH2CH3 + 13O2 > 8CO2+ 10 H2O
For one mole of butane 104g oxygen is required.
For 5.8 g of butane
=104×5.8÷58
= 10.4
For 5.8g of butane 10.4g of oxygen is required