How much energy is needed to heat and melt 3.0 kg of copper initially at 83°c?
be mindful of significant figure rules for both multiplication and addition.

450 kcal
430 kcal
280 kcal
130 kcal

As we know that in order to melt the copper we need to take the temperature of copper to its melting point

So here heat required to raise the temperature of copper is given as

We know that

melting temperature of copper = 1085 degree C

Specific heat capacity of copper = 385 J/kg C

now we have

now in order to melt the copper we know the heat required is

here we know that

L = 205 kJ/kg

now from above formula

now total heat required will be

As we know that

now we have