What mass of water can be heated by 4200J of heat at 10 degrees Celsius?

As we know for sure from the school physics course, when we need to determine how much heat is required in order to heat a conditional substance by a certain number of degrees, we must use this formula:
Q = m * c * Δt.
Let us determine how much water it will be possible to heat by 10 °, if, according to the condition of our task, 4200 Joules of heat will be used for this:
4200: 4200: 10 = 0.1.
Let’s convert the mass to grams:
0.1 kg = 100 grams.
Answer: The mass is 100 grams.