Question

How much energy is required to heat an iron nail with a mass of 25.5 grams from 65°C until it becomes red hot at 720°C?

(C for iron = 0.4494 J/g°C).
Part A: Enter the variable symbol for the quantity you need to find. Use your keyboard and the keypad to enter your answer. Then click Done.

Answer 1

`7506.1035J`

Step-by-step explanation:

We can use the relation

Q =mcΔθ

to find the energy required to heat the iron nail, where Q is the heat energy required, m is the mass of the nail and Δθ is change in temperature and c is heat capacity of the iron nail.

Also, from the question,

`m= 25.5g`

c = 0.4494J/g°C

Δθ=720 - 65 = 655°C

By substitution

`Q =25.5 * 0.4494 * 655`

`Q=7506.1035J`

Hence the energy required to heat the iron nail is 7506.1035J