Liquid benzene (C6H6) burns in oxygenaccording to the equation2C6H6(l)

1.	Liquid benzene (C6H6) burns in oxygenaccording to the equation2C6H6(l)+1502(g) 12CO2(g)+6H20(g)How many litres of 02 at STP are needed tocomplete the combustion of 39 g of liquidbenzene? (Moiwt of 02-32, C6H6=78)11.[AIPMT 1996](A) 74 L(C) 22.4 L(B) 11.2 L(D) 84 L
Answer» 2 C6H6 + 15O2 ---------------> 15CO2 + 6H2O Given, 39 gm of liquid benzene i,e 0.5 mole of benzene therefore, Moles of O2 = 15/4 therefore, Volume at STP = 15/4 X 22.4L = 84L

Liquid benzene (C6H6) burns in oxygenaccording to the equation2C6H6(l)+1502(g) 12CO2(g)+6H20(g)How many litres of 02 at STP are needed tocomplete the combustion of 39 g of liquidbenzene? (Moiwt of 02-32, C6H6=78)11.[AIPMT 1996](A) 74 L(C) 22.4 L(B) 11.2 L(D) 84 L

Answer»

2 C6H6 + 15O2 ---------------> 15CO2 + 6H2O

Given,

39 gm of liquid benzene i,e 0.5 mole of benzene

therefore,

Moles of O2 = 15/4

therefore,

Volume at STP = 15/4 X 22.4L

= 84L