Question

how much heat must be added to 5.0 g of solid lead at 30 degrees celcius to convert it to liquid lead at the melting point?

Answer 1

Note the correct spelling of celsius.

The melting point of Pb is 327.5 C.
q added to raise temperature from 30 C to 327.5C is
q1 = mass Pb x specific heat Pb x delta T. You will need to look up the specific heat Pb. delta T is 327.5-30.

q2 = heat needed to melt Pb at 327.5 C is
q2 = mass Pb x heat fusion Pb.
You will need to look up the heat fusion.
Total q = q1 + q2.

Answer 2

thanks dr.bob

Answer 3

so is the answer 316 joules?

Answer 4

You didn't provide what you used for the melting point or the heat fusion or the specific heat so I don't know it that is right or not. Using 327.5 for m.p. and 22.4 J/g for heat fusion and 0.16 J/g*C, I obtained 350 Joules.