Question

in an experiment 1 kg of fuel was completely burnt. The heat produced was measured to be 9000 kj.
a. what will be the heat produced for 7 kg of fuel .
b. calculate the calorific value of the fuel.

Answer 1

a] 63000kj

b] I don't know calorific value

Answer 2

Answer:

The calorific value of the fuel is $9000kJ/kg$.

Explanation:

Given,

The weight of the fuel, W₁ = $1kg$

The heat produced by the fuel, Q₁ = $9000kJ$

a)

The weight of the fuel, W₂ = $7kg$

The heat produced for 7 kg of fuel, Q₂ =?

As we know,

• The heat produced by the $1kg$ of fuel = $9000kJ$

Therefore,

• The heat produced by the $7kg$ of fuel = $(7\times 9000 )kJ$ = $63000kJ$

b)

The calorific value of the fuel =?

As we know,

• The calorific value of the fuel is defined as the ratio of the amount of heat produced to the total weight of the fuel.
• $Calorific value = \frac{Q}{W}$

Here,

• Q = Heat produced
• W = Weight of the fuel

Now,

• The calorific value of the $1kg$ fuel = $\frac{Q_{1} }{W_{1} }$ = $\frac{9000}{1}$ = $9000kJ/kg$
• The calorific value of the $7kg$ fuel = $\frac{Q_{2} }{W_{2} }$ = $\frac{63000}{7}$ = $9000kJ/kg$

Hence, the calorific value of the fuel is $9000kJ/kg$.