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

Q = mct  

-Q= energy in Joules  

-m = mass in grams  

-c= specific heat capacity in J/g degree C  

-t = delta temperature in degrees Celsius  

So,  

Q = m c t  

Q = (7 grams)(0.448J/g C)(750 C - 25 C)  

Q = 2273.6 J  

Your final answer = 2273.6 Joules

Answer 2

Energy is the amount required by the substance to proceed with the chemical reactions. The energy required by the iron nail will be 2273.6 joules.

What is energy?

Energy is the product of the mass, specific heat capacity and change in the temperature. It is given as:

$\rm Q = mC\Delta T$

Given,

Mass of the iron nail (m)= 25.5 gm

Specific heat capacity of iron (C) = 0.4494 J/g per degree C

Change in temperature = 725 degrees Celsius

Substituting values in the equation:

$\begin{aligned} \rm Q &= \rm mC\Delta T\\\\&= 7\times 0.448\times 725\\\\&= 2273.6\;\rm J\end{aligned}$

Therefore, 2273.6 joules is energy.

Learn more about energy here:

https://brainly.com/question/7203832