Question

How much water is produced on the burning of c7h16 ?? (Pls answer )

Answer 1

Answer:

8 moles of water

Explanation:

This is the combustion reaction and it is done by burning the substance in the presence of oxygen   :

$C_{7}H_{16}+11O_{2}\rightarrow 7CO_{2}+8H_{2}O$

How to start :

First , note that every combustion reaction produce CO2 and H2O as products

So , unbalanced equation is :

$C_{7}H_{16}+O_{2}\rightarrow CO_{2}+H_{2}O$

1. Balance the Carbon "C"

There are 7 carbon in C7H16 , so it will form same number of CO2.Hence , the reaction now become

$C_{7}H_{16}+O_{2}\rightarrow 7CO_{2}+H_{2}O$

2. Balance Hydrogen"H"

There are 16 hydrogen in C7H16 ,

water(H2O) has 2 hydrogen , hence C7H16 produce 8 H2O

$C_{7}H_{16}+O_{2}\rightarrow 7CO_{2}+8H_{2}O$

3. Balance the Oxygen only after balancing C and H

Count the number of Oxygen(O) in the products: 7CO2 + 8H2O

7 CO2 =  2(7) oxygen = 14 O

8H2O = 8(1) = 8 O

Total oxygen in product = 8 + 14 = 22

Total oxygen in reactant(O2) = 2

So we have to make 2 into 22

It is done by multiplying O2 with 11

Hence the balanced equation is :

$C_{7}H_{16}+11O_{2}\rightarrow 7CO_{2}+8H_{2}O$

Check the elements are balanced or not on both side :

O= 22

H = 16

C= 7