Stoichiometry

2H₂ + O₂ → 2H₂O

How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2 mol

• 4 mol

• 6 mol

• 8 mol

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NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH + H₂

How many grams of hydrogen are produced if 120 g of Na are available?

• 5.3 g

• 2.6 g

• 690 g

• 45 g

Tags

NGSS.HS-PS1-7

3Mg + Fe₂O₃ → 3MgO + 2Fe

What is the mole ratio of Mg to Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg/ 3 mol Fe

• 1 mol Fe/ 2 mol Fe

• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl

How many molecules of potassium chloride can be produced from 35.6 g of chlorine?

• 749 molecules

• 6.05x10²³ molecules

• 4.79x10²³ molecules

• 814 molecules

2Na + 2H₂O → 2NaOH+ H₂

How many grams of hydrogen are produced if 1.20x10²⁴ molecules of Na are available?

• 2.01 g

• 3.60 g

• 6.90 g

• 4.53 g

CH₄ + 2O₂ → CO₂ + 2H₂O

How many moles of carbon dioxide are produced from the combustion of 110. g of CH₄?

• 13.7 mol

• 2.75 mol

• 6.11 mol

• 6.85 mol

2NaClO₃ → 2NaCl + 3O₂

12.0 moles of NaClO₃ will produce how many grams of O₂?

• 256 g

• 576 g

• 288 g

• 479 g_

Tags

NGSS.HS-PS1-7

Fe + S → FeS

How many grams of FeS can form if 7.62 g of Fe are reacted?

• 14.8 g

• 12.0 g

• 13.7 g

• 19.9 g

Tags

NGSS.HS-PS1-7

2KClO₃ → 2KCl + 3O₂

How many moles of oxygen are produced when 6.70 moles of KClO₃ decompose completely?

• 6.70 mol

• 1.00 mol

• 10.1 mol

• 4.50 mol

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl

How many molecules of potassium chloride can be produced from 42.6 grams potassium bromide?

• 749 molecules

• 2.16x10²³ molecules

• 47.9 molecules

• 8.14x10²⁴ molecules