Stoichiometric Calculations (P)

Choose the correct setup for calculating the mass of HCl required to form a given mass of NaCl.

g NaCl x ( mol NaCl / g NaCl) x (1 mol HCl / 1 mol NaCl) x (g HCl / mol HCl)

correct set up 1.84 x ( 58.44 g NaCl / 1 mol NaCl) = 108 g

got it!

As the mass of a sample increases, the number of moles present in the sample increases. decreases. remains the same.

increases

To determine the mass of CO2 that forms from a given mass of CaCO3, which of the following must be known? Check all that apply. molar mass of CaCO3 molar mass of CaO mole ratio of CaCO3 to CO2 mole ratio of CaO to CO2 molar mass of CO2 mass of CaO formed

molar mass of CaCO3 mole ratio of CaCO3 to CO2 Molar mass of CO2

What is the mass of 1.84 mol NaCl? Give your answer to the correct number of significant figures. (Molar mass of NaCl = 58.44 g/mol)1.84 mol NaCl =

108 g NaCl

C3H8 + 5O2 → 3CO2 + 4H2O What mass of propane is necessary to react with the amount of oxygen calculated in the previous question?

12.41 g C3H8

The molar mass of iron oxide (Fe2O3) is 159.7 g/mol. What is the correct way to write the molar mass of iron oxide as a conversion factor?

159.7 g Fe2O3 / 1 mol Fe2 O3

What mass of oxygen (O2) forms in a reaction that forms 15.90 g C6H12O6?(Molar mass of O2 = 32.00 g/mol; molar mass of C6H12O6 = 180.18 g/mol)15.90 g C6H12O6 =

16.94 g O2

A total of 2 mol iron oxide has a mass of 2.00 g. 159.7 g. 319.4 g. 79.85 g.

319.4 g

6CO2 + 6H2O C6H12O6 + 6O2What mass of glucose (C6H12O6) can form from 71.89 g CO2? (Molar mass of C6H12O6 = 180.18 g/mol; molar mass of CO2 = 44.01 g/mol)71.89 g CO2 =

49.05 g C6H12O6

What mass of oxygen forms from 71.89 g CO2? Use the periodic table to find molar masses.71.89 g CO2 =

52.27 g O2

6CO2 + 6H2O → C6H12O6 + 6O2What mass of water is required to react completely with 157.35 g CO2? (Molar mass of H2O = 18.02 g/mol; molar mass of CO2 = 44.01 g/mol)157.35 g CO2 =

64.43 g H2O

CaCO3 CaO + CO2How many moles of CaO form when 98.60 g CaCO3 decompose?98.60 g CaCO3 =

0,9851 mol Cao

NaOH + HCl → NaCl + H2OWhat mass of water forms when 2.75 × 10-4 mol NaOH reacts completely?2.75 × 10-4 mol NaOH =

0.00496 g H2O

C3H8 + 5O2 → 3CO2 + 4H2OIf a propane heater burns 38.95 g C3H8, it consumes 38.95 mol C3H8. 0.8830 mol C3H8. 1 mol C3H8. 44.10 mol C3H8.

0.8830 mol C3H8

The molar mass of aluminum oxide (Al2O3) is 102.0 g/mol. What is the correct way to write the inverted molar mass of aluminum oxide as a conversion factor?

1 mol Al2 O3 / 102.0 g Al 2 O3

C3H8 + 5O2 → 3CO2 + 4H2O How many moles of oxygen are required to produce 37.15 g CO2?37.15 g CO2 =

1,407 mol O2

2H2 +O2 → 2H2OWhat mass of water forms when 1.45 × 10-3 g O2 react completely? (Molar mass of O2 = 32.00 g/mol; molar mass of H2O = 18.02 g/mol) 1.63 × 10-3 g 8.16 × 10-4 g 1.29 × 10-3 g

1.63 x 10^-3