Question

Find mass of oxygen require for complete combustion of 90 g of C2H6?
(A) 136 g (B) 236 g
(C) 336 g (D) 436 g

Answer 1

Answer:

Correct option is

B

1.92 kg

Balanced reactio is:

C

2

H

4

+3O

2

→2CO

2

+2H

2

O

molar mass of C

2

H

4

=28 g

molar mass of O

2

=32 g

from the reaction 3×32=96 gO

2

is required for 28 g ethene.

thus 560 g ethene will require =

28

96

×560=1920g O

2

or 1.92 kg oxygen

option B is correct