Question

on combustion, 1 mole of an alkane gives 2 moles of carbon dioxide and 3 moles of water. Suggest the molecular formula of this alkane​

Answer 1

Answer:

on cumbustion

Explanation:

O.2 mole of alkane gives 26.4 g of CO

2

Hence, 1 mole gives

O.2

26.4

g of CO

2

=132g of CO

2

1 mole of CO

2

is 44 gm

132 of CO

2

means 3 moles

∴ Alkane has 3 carbon atom and therefore, it is providing 3CO

2

Formula is C

3

H

8

(propane)

Molecular weight of C

3

H

8

is 44.