Question

Need help setting up question 6U.S annual energy consumption = 1.0 x 10²⁰The energy released by burning 1 kg of coal = 1.6 x 10⁹

Answer 1

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,

`\text{1}.0*10^(20)/1.6*10^9=(1*10^(20))/(1.6*10^9)=6.25*10^(10)`

So, the answer will be:

The number of kilograms of coal = 6.25 x 10¹⁰