How many atoms are in 12.9 mol Au? Group of answer choices

a. 7.77x1024 atoms

b. 2.14x10-23 atoms

c. 6.02x1023 atoms

d. 1.38x1023 atoms

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.)