Question

When a certain amount of octane, C8H18, is burnt completely, 7.04 g CO2 is formed. What is the mass
of H2O formed, simultaneously?​

Answer 1

Explanation:

2C

8

H

18

(g)

+25O

2

(g)

⟶16CO

2

(g)

+18H

2

O

(l)

704 g of CO

2

is obtained from 228 g C

8

H

18

∴ 7.04 g of CO

2

is obtained from 2.28 g C

8

H

8

∴ amount of water formed from 228 g C

8

H

8

=18×18=324g

⇒ amount of water formed from 2.28 g C

8

H

8

=

228

324

×2.28=3.24g

Hence, mass of H

2

O formed is 3.24 g.