Two substances have different δhfusion values. if given the same number of moles of each substance, and assuming the same amount of heat is applied to both substances, the substance with a lower δhfusion value will convert from a solid to a liquid more quickly. true false

True.

Explanation:

ΔHfusion value is defined as the amount of energy needed to produce a phase change in 1 mole of substance at constant pressure, specifically from solid to liquid. Let´s imagine two random substances A and B, with ΔHfusionA= 100 J/mol and ΔHfusionB=200J/mol. If we apply 150J of energy in 1 mol of each substance, we have enough energy for melt A, but we still need 50J for melt B. For that reason a low value of ΔHfusion means is easier to convert it from solid to liquid.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).