A student performs the following reaction in the lab: H2SO4 + Ba(OH)2 = BaSO4 + 2 H20

The student determines that 18.3 g of barium sulfate can be formed from 7.68 g of sulfuric acid. What is the percent yield of the reaction if only 14.4g of barium sulfate is 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.)