Assuming that petrol is octane (CBH18) andhas density 0.8 g/ml, 1.425

1.	Assuming that petrol is octane (CBH18) andhas density 0.8 g/ml, 1.425 litre of petrol oncomplete combustion will consume.(A) 50 mole of O2 (B) 100 mole of O2(C) 125 mole of O2 (D) 200 mole ofO2
Answer» mass of C8H18 is - volume * density = 0.81425 = 1140 gm now, equation of combustion of is 2C8H18 + 25O2 → 18H20 + 16CO2 now, moles of C8H18 = 1140/114 = 10moles so , for 2 moles → 25 moles of O2 are need then for 10 moles → 255 = 125 moles of O2 is required.

Assuming that petrol is octane (CBH18) andhas density 0.8 g/ml, 1.425 litre of petrol oncomplete combustion will consume.(A) 50 mole of O2 (B) 100 mole of O2(C) 125 mole of O2 (D) 200 mole ofO2

Answer»

mass of C8H18 is - volume * density = 0.8*1425 = 1140 gm

now, equation of combustion of is

2C8H18 + 25O2 → 18H20 + 16CO2

now, moles of C8H18 = 1140/114 = 10moles

so , for 2 moles → 25 moles of O2 are need

then for 10 moles → 25*5 = 125 moles of O2 is required.