Question

How many moles of oxygen will react with 1 mole of an aliphatic compound C3Hg? The reaction is given as: C3H8 + O2(Excess) + CO2 + H2O​

Answer 1

Answer:

Solution

Correct option is

A

0.37

The average molar mass is M=

P

ρRT

=

1atm

1.7g/L×0.0821Latm/mol/K×273K

=38.1g/mol

Let x be the mole fraction of CO. The mole fraction of CO

2

will be 1−x

The molar masses of CO and CO

2

are 28 g/mol and 44 g/mol respectively.

The average molar mass of the mixture is, 38.1=

1

28x+44(1−x)

.

Hence, x=0.37

Hence, the mole fraction of CO is 0.37.