1) 2 kg of solid copper is at its melting point. How much energy does it take to melt all the copper?
Heat of fusion: 134 J/g
Heat of Vaporization 5060 J/g
q= mHf
I know the equation but I do not understand know if this is correct.
2kg= 2000 grams
q=(2000g) (134J/g)
q=(2000) (134J)
q=268000J
Correct. Go to the head of the class.
Your approach is correct, but there is a small mistake in your calculation. Let's correct it step by step:
1) First, convert the mass of copper from kg to grams:
2 kg = 2000 grams
2) Use the equation q = mHf, where q is the amount of energy required, m is the mass of the substance, and Hf is the heat of fusion.
q = (2000 grams) * (134 J/g)
q = 268000 J
So, the correct amount of energy required to melt all the copper is 268000 J.