PLEASE HELP ME. ILL GIVE BRAINLIESTT

What is the mass of 8 moles of sodium atoms

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.)