Question

How many grams of ice could be melted by using 67,000 joules of energy? (Hint: identify the phase change and which formula to use and then just plug in and solve for the missing variable! Don’t forget to convert Joules (J) to kilojoules (KJ) by moving the decimal 3 places to the left.)

Answer 1

200.87 g

Step-by-step explanation:

In order to calculate the mass of ice that could be melted by using 67,000 J of energy, we will use the following expression.

Q = ΔH°f × m

where,

• Q: heat required (67,000 J)

• ΔH°f: enthalpy of fusion of water (333.55 J/g)

• m: mass of water

`m = (Q)/(\Delta H\°_f ) =(67,000J)/(333.55J/g) = 200.87 g`

67,000 J of energy can be used to melt 200.87 grams of ice.