Question #fb2c9

1 Answer
May 18, 2017

Answer:

The heat required is a) 16.7 kJ.

Explanation:

The formula to calculate the amount of heat #q# required to melt a substance is

#color(blue)(bar(ul(|color(white)(a/a)q =nΔ_text(fus)Hcolor(white)(a/a)|)))" "#

where

#ncolor(white)(mml) = # the number of moles and
#Δ_text(fus)H =# the molar heat of fusion of the substance

Step 1. Calculate the moles of water

#n = 50.0 color(red)(cancel(color(black)("g water"))) × "1 mol water"/(18.02 color(red)(cancel(color(black)("g water")))) = "2.775 mol water"#

Step 2. Calculate the heat required

#q = 2.775 color(red)(cancel(color(black)("mol"))) × "6.02 kJ"/(1 color(red)(cancel(color(black)("mol")))) = "16.7 kJ"#