The heat of fusion of a compound is 126 Joules per gram. What is the total number of Joules of
heat that must be absorbed by a 15.0-gram
sample to change the compound from solid to
liquid at its melting point?

1.89 × 10³ J

Explanation:

Step 1: Given data

Step 2: Calculate the heat (Q) required to melt the sample

The fusion is the phase change from solid to liquid. We can calculate the heat required for the fusion of the sample using the following expression.

Q = ΔH°fus × m

Q = 126 J/g × 15.0 g

Q = 1.89 × 10³ J

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)