Given:
The energy released by burning 1 kg of coal = 1.6 x 10⁹
And from the table:
U.S annual energy consumption = 1.0 x 10²⁰
So, to find the number of kilograms of coal, we will divide the total energy consumption by the energy released from 1 kg of coal
so,
[tex]\text{1}.0\times10^{20}\div1.6\times10^9=\frac{1\times10^{20}}{1.6\times10^9}=6.25\times10^{10}[/tex]
So, the answer will be:
The number of kilograms of coal = 6.25 x 10¹⁰
