Question

A metallurgist has a 42.0-gram sample of an object of unknown composition. On testing it, the metallurgist finds that it takes 2,878 joules of heat to melt it completely. What is the object's heat of fusion?

Answer 1

68.5 in sig figs 68.52 not in sig figs

Step-by-step explanation:

Answer 2

Answer: The object's heat of fusion is 68.52 Joules/gram.

Step-by-step explanation:

Mass of the sample = 42 grams

Energy required to melt the sample completely = 2878 Joules

`Q=m*\Delta H_(fusion)`

`2878 Joules=42* \Delta H_(fusion)`

`\Delta H_(fusion)=(2878 Joules)/(42 g)=68.52 Joules/gram`

The object's heat of fusion is 68.52 Joules/gram.