Latent Heat: Physics/ Chemistry
Please tell me how to do this too instead of just telling me the answer so I can actually understand what to do.

Calculate the amount if heat needed to melt 5kg of ice at 0 degrees Celsius and raise the temperature of the water to 50 degrees Celcius.​

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?