I need help with these 7 questions ASAP pls

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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.)

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n