Use PV = nRT.
You know P, V, R, and T. Don't forget to change T to Kelvin (273 + C = K). Use V in liters. Solve for n. Then n = # mols = grams/molar mass.
Calculate the mass of CaCO3 that would produce 40 mL at STP.
STP means P= 1 atm and T= 0 degrees C.
How do I find the mass?
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