please help me with chemistry and heat

Question

Calculate the amount of heat needed to melt 2.0 kg of iron at its melting point (1809 K) given that: ΔH_fus = 13.80 kJ/mol.

A. 27,600 kJ

B. 25,000kJ    

C. 494 kJ

D. 27.6 kJ

Answer 1

2.0 kg Fe x 1000 g / kg x 1 mol/55.8 g = 35.84 moles Fe

35.84 moles Fe x 13.80 kJ/mol = 494 kJ (answer C)