Question

If 8grams of H2 and 8grams of O2 were mixed and then ignited the mass in grams of the resulting water will be?​

Answer 1

Answer:

the mass of the resulting water will be 7 grams of H2

Explanation:

Given

mass of H2 = 8 g

mass of O2 = 8 g

Solution

as oxygen is more massive then hydrogen about 16 %

in order to form water 2 hydrogen atoms are required while one oxygen atom. the mass ratio is 1:8 between H : O

therefore,

8 grams oxygen + 1 gram hydrogen

burned with 100% efficiency

9 grams of H20  will formed while the remaining 7 grams of H2 left untreated.

Answer 2

The molecular masses of hydrogen, oxygen and water are 2 g/mole, 32 g/mole and 18 g/mole respectively.

2H

2

+O

2

→2H

2

O

2×2=4 g of hydrogen reacts with 1×32=32 g of oxygen to form 2×18=36 g of water.

Hence,

4

4

=1 g of hydrogen reacts with

4

32

=8 g of oxygen to form

4

36

=9 g of water.

9 grams of water can be produced when 8 g of hydrogen reacts with 8 g oxygen.