The graph shows the temperature versus time relationship for 2 kg of particular substance. The substance is in the solid state at a room temperature of 20 degrees Celsius.

- The 100 joules of heat is needed to completely change the substance from a solid to a liquid state, what is the heat of fusion for the substance?

My work:
my answer i got is 50

your answer is worthless without units.

heat=Hf*mass
Hf= heat/mass= 100j/2kg= 50 j/kg

To determine the heat of fusion for the substance, we can use the equation:

Q = m * H

Where:
Q = heat energy transferred
m = mass of the substance
H = heat of fusion

In this case, we are given that 100 joules of heat is needed to completely change the substance from a solid to a liquid state. We also know that the mass of the substance is 2 kg.

Using the equation, we can rearrange it to solve for H:

H = Q / m

Substituting the values:

H = 100 J / 2 kg

H = 50 J/kg

Therefore, the heat of fusion for the substance is 50 joules per kilogram (J/kg).