If 37.4 grams of H3PO4 reacts with 83 grams of MgCO3 according to this reaction: 2H3PO4 + 3MgCO3 --> Mg3(PO4)2 + 3CO2 + 3H2O
1. calculate the volume of carbon dioxide gas produced at STP?
2. Calculate the grams of Mg3(PO4)2 produced.

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.)