I really need help with these chemistry questions pleasee

The answer to your question is given below

Explanation:

8. The equation for the reaction is given below:

Mg3N2 + H2O –> Mg(OH)2 + NH3

Number of reactant atoms before balancing:

Mg = 3

N = 2

H = 2

O = 1

Number of product atoms before balancing:

Mg = 1

N = 1

H = 5

O = 2

Now, let us balanced the equation.

Mg3N2 + H2O –> Mg(OH)2 + NH3

There are 3 atoms of Mg on the left side and 1 atom on the right side. It can be balance by putting 3 in front of Mg(OH)2 as shown below:

Mg3N2 + H2O –> 3Mg(OH)2 + NH3

There are 2 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 2 in front of NH3 as shown below:

Mg3N2 + H2O –> 3Mg(OH)2 + 2NH3

There 2 atoms of H on the left side and a total of 12 atoms on the right side. It can be balance by putting 6 in front of H2O as shown below:

Mg3N2 + 6H2O –> 3Mg(OH)2 + 2NH3

Now the equation is balanced.

Number of reactant atoms after balancing:

Mg = 3

N = 2

H = 12

O = 6

Number of product atoms after balancing:

Mg = 3

N = 2

H = 12

O = 6

9. When methane react with steam, carbon dioxide and hydrogen gas are produced as shown below:

CH4 + H2O –> CO + H2

Now, let us balance the equation. This is illustrated below:

There are a total of 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2 as shown below:

CH4 + H2O –> CO + 3H2

Now the equation is balanced.

2b2t

explanation:

2b2t