Mass lost in chemical reactions?

[jlp]

Homework Statement

In chemical reactions, when energy is released, mass is lost according to Einstein’s formula just as it is for nuclear energy (though the amounts lost are so small that for centuries scientists thought that mass was conserved). When a kilogram of coal is burned, it releases about 40 million joules of energy.

a. What amount of mass is lost?
b. How many carbon atoms would it take to match the amount of mass that is lost?

Homework Equations

mass = 2.0 × 10- 26 kg
1H + Energy n + e+ + v ----> is this a formula that needs to be used?

The Attempt at a Solution

I am so lost...:( can anyone help!?

 

[ehild]

Homework Equations

mass = 2.0 × 10- 26 kg
1H + Energy n + e+ + v ----> is this a formula that needs to be used?

How is energy and mass related? You certainly remember Einstein's famous equation.

ehild