Moles And Stoichiometry Practice Problems Answers - MS.

Answers : Moles and Stoichiometry Practice Problems 1) How many Moles of sodium atoms correspond to atoms of sodium? x 1021 atoms Na x 1 mol Na = x 10-3 mol Na x 1023 atoms Na 2) Determine the mass in grams of each of the following: a. mol of Fe mol Fe x g Fe = g Fe 1 mol Fe b. mol O mols O x g O = 392 g O 1 mol O c. mol Ca3(PO4)2 mols Ca3(PO4)2 x g Ca3(PO4)2 = 388 g Ca3(PO4)2 1 mol Ca3(PO4)2 d. mol Fe(NO3)3 mols Fe(NO3)3 x g Fe(NO3)3 = 151 g Fe(NO3)3 1 mol Fe(NO3)3 e. mol C4H10 mols C4H10 x g C4H10 = g C4H10 1 mol C4H10 3) Calculate the number of Moles of each compound: a. CaCO3 g CaCO3 x 1 mol CaCO3 = mol CaCO3 g CaCO3 b. NH3 g NH3 x 1 mol NH3 = mol NH3 g NH3 c. Sr(NO3)2 g Sr(NO3)2 x 1 mol Sr(NO3)2 = mol Sr(NO3)2 g Sr(NO3)2 4) How many Moles of Al are needed to combine with mol of O2 to make aluminum oxide, Al2O3?

Answers: Moles and Stoichiometry Practice Problems 1) How many moles of sodium atoms correspond to 1.56x1021 atoms of sodium? 1.56 -x 1021 atoms Na x 1 mol Na = 2.59 x 10 3 mol Na 236.022 x 10 atoms Na 2) Determine the mass in grams of each of the following: a. 1.35 mol of Fe 1.35 mol Fe x 55.845 g Fe = 75.4 g Fe

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