Gas Stoichiometry

Given the reaction: Mg + 2 HCl → MgCl₂ + H₂ What is the total number of grams of Mg consumed when 0.50 mole of H₂ is produced?

• 6.0 g

• 12 g

• 3.0 g

• 24 g

Tags

NGSS.HS-PS1-7

Given the reaction: 4 Al + 3 O₂ → 2 Al₂O₃ What is the total number of moles of aluminum oxide that can be formed when 2.0 moles of aluminum reacts completely with oxygen?

• 1.0 mole

• 2.0 moles

• 3.0 moles

• 4.0 moles

Tags

NGSS.MS-PS1-5

Given the reaction: 2 H₂ + O₂ → 2 H₂O The total number of grams of O₂ needed to produce 3 moles of water is

• 36

• 48

• 61

• 75

If 300 grams of Oxygen gas is produced, how many grams of Hydrogen peroxide decomposed?

• 318 g H₂O₂

• 1,275.8 g H₂O₂

• 637.9 g H₂O₂

• 159.4 g H₂O₂

Tags

NGSS.HS-PS1-7

How many grams of Copper (II) oxide are produced by 80 grams of Oxygen gas?

• 397.75 g CuO

• 795.5 g CuO

• 198.88 g CuO

• 99.44 g CuO

Tags

NGSS.HS-PS1-7

Use this equation: 2H₂ (g) + O₂ (g) → 2H₂O (l) If 50 grams of Hydrogen gas and 50 grams of Oxygen gas are used to produce water, which reactant is the limiting reactant?

• H₂ (g)

• O₂ (g)

• H₂O (l)

• Neither is limiting.

Tags

NGSS.HS-PS1-7

Which answer choice correctly balances this equation?Al (s) + O₂ (g) → Al₂O₃ (s)

• It is already balanced.

• 2 Al (s) + 3O₂ (g) → 2Al₂O₃ (s)

• 4 Al (s) + 6O₂ (g) → 4Al₂O₃ (s)

• 4 Al (s) + 3O₂ (g) → 2Al₂O₃ (s)

Tags

NGSS.HS-PS1-7

Use this equation: 2H₂O₂ (aq) →2H₂O (l) + O₂ (g) If 3 moles of water are produced, how many moles of Oxygen gas are produced?

• 6 mol O₂

• 1.5 mol O₂

• 3 mol O₂

• 24 mol O₂

Tags

NGSS.HS-PS1-7

Use this equation: 2H₂O₂ (aq) →2H₂O (l) + O₂ (g) If 120 grams of Hydrogen peroxide decompose, how many moles of water are produced?

• 3.53 mol H₂O

• 7.05 mol H₂O

• 1.76 mol H₂O

• 4,082.40 mol H₂O

Use this equation: 2H₂O₂ (aq) →2H₂O (l) + O₂ (g) If this decomposition produces 450 grams of water, how many grams of Hydrogen peroxide decomposed?

• 849.56 g H₂O₂

• 275,868.18 g H₂O₂

• 424.78 g H₂O₂

• 24.97 g H₂O₂

Tags

NGSS.HS-PS1-7