How much 2.0 M NaCl solution would you need to make 250 mL of 0.15 M NaCl solution?

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

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.)