How much heat is gained or lost when 200 grams of ice melts?

you need to first look for the latent heat of fusion (Lf) --- this is a constant, then use the formula:

Q = m(Lf)
where Q = heat in Joules, m = mass in grams
*since it melted, it definitely absorbed/gained heat, thus Q is (+)

so there,, :)

To determine the amount of heat gained or lost when ice melts, we need to use the specific heat formula:

Q = m * Hf

Where:
Q = heat gained or lost
m = mass of the substance changing phase (in grams)
Hf = specific heat of fusion (amount of heat required to change 1 gram of substance from solid to liquid phase) in calories/gram

In the case of ice, the specific heat of fusion is 79.7 calories/gram.

Now, let's calculate the heat gained or lost:

Q = 200 grams * 79.7 calories/gram
Q = 15,940 calories

Therefore, when 200 grams of ice melts, it gains or loses 15,940 calories of heat energy.