What amount of heat is exchanged when 106.2 grams of substance Y goes from a liquid at 35 degrees Celsius to a solid at the same temperature? Melting point of substance Y = 35 degrees C; ΔHvaporization = 3.67 J/mol; ΔHfusion = 3.30 J/mol. MWsubstance y = 28.22 g/mol.

−12.4 J

−3.51 x 102 J

1.24 x 101 J

351 J

Question

What amount of heat is exchanged when 106.2 grams of substance Y goes from a liquid at 35 degrees Celsius to a solid at the same temperature? Melting point of substance Y = 35 degrees C; ΔHvaporization = 3.67 J/mol; ΔHfusion = 3.30 J/mol. MWsubstance y = 28.22 g/mol.
		
−12.4 J
		
−3.51 x 102 J
		
1.24 x 101 J
		
351 J

nvidiaintely · Answer

@JFraser @AloneS @Awolflover1 @Glitter

jfraser · Answer

since the substance is at its freezing point, we use the equation for heat of fusion, but you're given $grams$ of Y, and the heat of fusion is given in $J/mol$. But you're also given the molar mass of Y, so this is just a two-step problem

Convert the grams of Y into moles of Y, using the molar mass.

Convert the moles of Y into Joules, using the heat of fusion

nvidiaintely · Answer

So the answer is option A.

nvidiaintely · Answer

Correct @JFraser?

jfraser · Answer

why did you pick the negative option?