10 ✨ Stoichiometry

Mole-to-mole calculations: Please show your work! How many moles of K₂O will be formed when 1.52 moles of K reacts with O₂ according to the following reaction: 4 K + O₂ → 2 K₂O

• 0.76 moles

• 1.52 moles

• 3.04 moles

• 2.28 moles

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NGSS.HS-PS1-7

How many moles of Cu are needed to produce 0.25 moles of Cu₂S according to the following reaction: 2 Cu + S → Cu₂S?

• 0.25 moles

• 0.5 moles

• 1 mole

• 2 moles

How many moles of Na are needed to react with H₂SO₄ to produce 3.75 moles of Na₂SO₄ according to the following reaction: 2 Na + H₂SO₄ → Na₂SO₄ + H₂?

• 3.75 moles

• 7.50 moles

• 1.88 moles

• 5.63 moles

Mole-to-mole calculations: Please show your work! How many moles of CaO will be produced when 1.6 moles of Fe₂O₃ reacts with Ca₃(PO₄)₂ according to the following reaction: Fe₂O₃ + Ca₃(PO₄)₂ → 2 FePO₄ + 3 CaO

• 1.6 moles

• 2.4 moles

• 3.2 moles

• 4.8 moles

Tags

NGSS.HS-PS1-7

Mass-to-mass calculations: Please show your work! How many grams of Fe is needed to produce 96 grams of Fe2S3 according to the following equation? (58.845 g Fe = 1 mol Fe, 207.9 g Fe2S3 = 1 mol Fe2S3) 2 Fe + 3 S → Fe2S3

• 54.4 grams

• 48.6 grams

• 32.8 grams

• 64.0 grams

Tags

NGSS.HS-PS1-7

Mass-to-mass calculations: If 48 g of Mg reacts with oxygen gas, how many grams of MgO will be formed according to the following equation? (24.305 g Mg = 1 mol Mg, 40.304 g MgO = 1 mol MgO) 2 Mg + O2 → 2 MgO

• 80.608 g

• 96.608 g

• 40.304 g

• 48.000 g

Tags

NGSS.HS-PS1-7

How many grams of CuCl can be produced from the reaction of 73.5 g of Cu2O according to the following reaction? (98.999 g CuCl = 1 mol CuCl, 143.09 g Cu2O = 1 mol Cu2O) Cu2O + 2 HCl → 2 CuCl + H2O

• 50.9 grams

• 101.8 grams

• 73.5 grams

• 147 grams

Mass-to-mass calculations: Please show your work! If 11.5 grams of Cl2 reacts with aluminum, how many grams of AlCl3 will be formed according to the following reaction? (70.9 g Cl2 = 1 mol Cl2, 133.34 g AlCl3 = 1 mol AlCl3) 2 Al + 3 Cl2 → 2 AlCl3

• 10.8 grams

• 15.2 grams

• 20.5 grams

• 25.0 grams

Tags

NGSS.HS-PS1-7