The molar heat of fusion of iron(II) sulfide (FeS) is 20.9kJ. What mass of melted FeS at its melting point must solidify to release 150.0 kJ of energy?

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium