Question

A battery weighing 0.525 lb can store 30.8 kcal of electrical energy. What is the energy density of the battery in Wh per kg? Give your answer to an accuracy of 3 significant figures.

Answer 1

Energy Density: 129.412
`(Wh)/(kg)`

Step-by-step explanation:

First of all, let's convert the battery weighing from pounds to kilograms:

0.525 lb x
`((0.454 kg)/(1 lb))` = 0.238 kg

Now let's convert the electrical energy from kcal to Wh:

30.8 kcal x
`((1 Wh)/(1 kcal))` = 30.8 Wh

Now we can calculate energy density as follows:

Energy Density =
`(30.8)/(0.238)`

Energy Density = 129.412
`(Wh)/(kg)`