Question

a student 600 ml cup of cocoa gets cold. It was only 25°C. He put it in the microwave. How many calories must transfer to the cocoa to bring it up to 70°C

Answer 1

To get the answer, you must know first the formula for heat.

Heat = mass X specific heat X change in temp

We know that the mass is 600

Specific heat is 1

And the change in temperature is 70 – 25 which is 45.

Now plugging in those values:

Heat = 600 x 1 x 45 = 27,000 calories

Note: calorie is a unit of heat