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Stoichiometry Worksheet Mmole-Mass, Mass-Mole Key, Exercises of Chemistry

Wayne State CollegeChemistry

Typology: Exercises

2020/2021
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Stoichiometry Worksheet #2 (mole-mass, mass-mole problems)
1. N2 + 2O2 โ†’ N2O4
a. If 15.0g of N2O4 was produced, how many moles of O2 were required?
15.0g N2O4
1 mol N2O4
2 mol O2
92.0g N2O4
1 mol N2O4
= 0.326 mol O2
b. If 4.0x10-3 moles of oxygen reacted, how many grams of N2 were needed?
4.0x10-3 mol O2
28.0g N2
1 mol N2
= 5.6x10-2 g N2
2. K3PO4 + Al(NO3)3 โ†’ 3KNO3 + AlPO4
a. What is the mass of potassium nitrate that is produced when 2.04 moles of potassium
phosphate react?
2.04 mol K3PO4
3 mol KNO3
101.1 g KNO3
1 mol K3PO4
1 mol KNO3
= 619g KNO3
b. If 5.80g of aluminum phosphate are formed, how many moles of aluminum nitrate
reacted?
5.80g AlPO4
1 mol AlPO4
1 mol Al(NO3)3
122.0g AlPO4
1 mol AlPO4
= 4.75x10-2 mol Al(NO3)3
3. CaC2 + 2H2O โ†’ Ca(OH)2 + C2H2
a. If you have 5.50 mol of CaC2, how much C2H2 do you get?
5.50 mol CaC2
1 mol C2H2
26.0g C2H2
1 mol CaC2
1 mol C2H2
= 143g C2H2
b. How many moles of water are needed when 65.0g of CaC2 have reacted?
65.0g CaC2
1 mol CaC2
2 mol H2O
64.1g CaC2
1 mol CaC2
= 2.03 mol H2O
4. In photosynthesis, water reacts with carbon dioxide to give oxygen and glucose (C6H12O6). Write
and balance the chemical equation. How many moles of CO2 are required to make 120.0g of
glucose?
6H2O + 6CO2 โ†’ C6H12O6 + 6O2
120.0g C6H12O6
1 mol C6H12O6
6 mol CO2
180.0 g C6H12O6
1 mol C6H12O6
= 4.000 mol CO2
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Stoichiometry Worksheet #2 (mole-mass, mass-mole problems)

1. N 2 + 2O 2 โ†’ N 2 O 4

a. If 15.0g of N 2 O 4 was produced, how many moles of O 2 were required? 15.0g N 2 O 4 1 mol N 2 O 4 2 mol O 2 92.0g N 2 O 4 1 mol N 2 O 4 = 0.326 mol O 2 b. If 4.0x10-^3 moles of oxygen reacted, how many grams of N 2 were needed? 4.0x10-^3 mol O 2 1 mol N 2 28.0g N 2 2 mol O 2 1 mol N 2 = 5.6x10-^2 g N 2

  1. K 3 PO 4 + Al(NO 3 ) 3 โ†’ 3KNO 3 + AlPO 4 a. What is the mass of potassium nitrate that is produced when 2.04 moles of potassium phosphate react? 2.04 mol K 3 PO 4 3 mol KNO 3 101 .1 g KNO 3 1 mol K 3 PO 4 1 mol KNO 3 = 619 g KNO 3 b. If 5.80g of aluminum phosphate are formed, how many moles of aluminum nitrate reacted? 5.80g AlPO 4 1 mol AlPO 4 1 mol Al(NO 3 ) 3 122 .0g AlPO 4 1 mol AlPO 4 = 4.75x10-^2 mol Al(NO 3 ) 3
  2. CaC 2 + 2H 2 O โ†’ Ca(OH) 2 + C 2 H 2 a. If you have 5.50 mol of CaC 2 , how much C 2 H 2 do you get? 5.50 mol CaC 2 1 mol C 2 H 2 26.0g C 2 H 2 1 mol CaC 2 1 mol C 2 H 2 = 143g C 2 H 2 b. How many moles of water are needed when 65.0g of CaC 2 have reacted? 65.0g CaC 2 1 mol CaC 2 2 mol H 2 O 64.1g CaC 2 1 mol CaC 2 = 2.03 mol H 2 O
  3. In photosynthesis, water reacts with carbon dioxide to give oxygen and glucose (C 6 H 12 O 6 ). Write and balance the chemical equation. How many moles of CO 2 are required to make 120.0g of glucose? 6H 2 O + 6CO 2 โ†’ C 6 H 12 O 6 + 6O 2 120.0g C 6 H 12 O 6 1 mol C 6 H 12 O 6 6 mol CO 2 180.0 g C 6 H 12 O 6 1 mol C 6 H 12 O 6 = 4.00 0 mol CO 2
  1. 2 NaClO 3 โ†’ 2 NaCl + 3 O 2 Balance and answer the following questions. a. How many grams of NaCl are produced when 20.00mol of NaClO 3 react? 20.00 mol NaClO 3 2 mol NaCl 58.5g NaCl 2 mol NaClO 3 1 mol NaCl = 1170g NaCl b. How many moles of O 2 are produced when 40g of NaCl are formed? 40 g NaCl 1 mol NaCl 3 mol O 2 58.5g NaCl 2 mol NaCl = 1 mol O 2
  2. 8Fe + S 8 โ†’ 8FeS How many moles of FeS are produced when 0.93g of S 8 react? 0.93g S 8 1 mol S 8 8 mol FeS 256.8 g S 8 1 mol S 8 = 2.9x10-^2 mol FeS
  3. Write a balanced chemical equation to represent the combustion of decane (C 10 H 22 ). How many moles of water will form with the combustion of 540.4g of decane? 2C 10 H 22 + 21O 2 โ†’ 20CO 2 + 22H 2 O 540.4g C 10 H 22 1 mol C 10 H 22 22 mol H 2 O 142.0g C 10 H 22 2 mol C 10 H 22 = 41.86 mol H 2 O
  4. Balance and then answer the following questions: _ 4 NH3(g) + 5 O2(g) โ†’ 4 NO(g) + 6 H 2 O(g) a. How many moles of NO are formed if 824g of NH 3 react? 824g NH 3 1 mol NH 3 4 mol NO 17.0g NH 3 4 mol NH 3 = 48.5 mol NO b. How many grams of water are formed if 2.55 mol of ammonia are oxidized? 2.55 mol NH 3 6 mol H 2 O 18.0 g H 2 O 4 mol NH 3 1 mol H 2 O = 68.9g H 2 O
  5. Mercury (II) oxide decomposes into mercury and oxygen gas. a. Write and balance the equation. 2HgO โ†’ 2Hg + O 2 b. How many moles of mercury (II) oxide are needed to produce 125g of oxygen? 125g O 2 1 mol O 2 2 mol HgO 32.0 g O 2 1 mol O 2 = 7.81 mol HgO