What is the molarity of a solution that contains 13.2 g of NaNO3 in 255 mL of solution?

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.)

Find the number of moles of argon in 364g of argon.

What is a difference between a mixture of elements and a mixture of compounds