1200 joules is added to a sample of ice to change it to water at 0°C what is the mass of the ice

Ineed ! i have no clue how to do this problem.

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?