Question

how much energy is required to take 15g of ice from -25 degrees Celsius to 55 degrees Celsius. draw a phase change graph for this question. if 25 grams of liquid water releases 75j of heat when water cools from 88 degrees Celsius what is the final temperature? (optional)

Answer 1

It's important to know that the heat capacity of water is 4,200 Joules per Kilogram per degree Celsius. In order to answer the problem, we have to use the following formula

`E=m* c*(T_f-T_i)`

Replacing all the given information, we have

`E=0.015kg\cdot4,200J/kgC\cdot(55-(-25))`

Then, we solve the expression

`\begin{gathered} E=63(55+25)Joules \\ E=63(80)Joules \\ E=5,040Joules \end{gathered}`