Mole Conversion Practice!! Avogadro’s Number, Molar Mass, Molar Volume

Name: Date: Block:

(a) How many atoms are in 2 molecules of Hg(IO3)2?

(b) What volume at STP is occupied by 1.45 x 1030 molecules of COF2 gas?

(c) How many molecules are there in 64.0 g of FeS?

(d) How many moles are in 25.0 mL of HCN at STP?

(e) What volume at STP is occupied by 43.5 g of ClF3?

(f) How many moles are in 2.75 x 10 23 atoms of Fe?

(g) How many molecules are there in 125 mL of NOCl at STP?

(h) What is the mass of 3.01 x 1022 atoms of Pt?

(i) What is the mass of 25.0 mL of Kr at STP?

(j)What is the molar mass of 00139 mol of a substance having a mass of 0.888 g? (j) What is the density of acetic acid, CH3COOH, if 0.250 mol of CH3COOH has a volume of 14.3

mL?

(k) How many moles are in 85.0 mg of CuSCN?

(l) If 135 L of cyanogen gas has a mass of 313 g at STP, what is the molar mass of cyanogen?