Test Review: Stoichiometry

CH₄( g) + 2 O₂( g) → CO₂( g) + 2 H₂O( g)

How many moles of oxygen are needed for the complete combustion of 12.0 moles of CH₄(g)?

• 24mol O₂

• 6mol O₂

• 4mol O₂

• 12mol O₂

N₂ + 3 H₂ → 2 NH₃

How many grams of ammonia are produced when 10.0 mole of nitrogen reacts?

• 340g NH₃

• 85g NH₃

• 170g NH₃

• 10mol NH₃

Tags

NGSS.HS-PS1-7

N₂( g) + 3 H₂( g) → 2 NH₃( g)

What is the total number of moles of NH₃( g) produced when 6 moles of H₂ (g) reacts completely with N₂( g)?

• 4 mol NH₃

• 9 mol NH₃

• 12 mol NH₃

• 6 mol NH₃

Tags

NGSS.HS-PS1-7

In this reaction,

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂,

what is the total number of moles of CO used to produce 28 grams of iron?

• 0.75 mol CO

• 1.5 mol CO

• 0.35 mol CO

• 0.5mol CO

Tags

NGSS.HS-PS1-7

2 C₂H₂( g) + 5 O₂( g) → 4 CO₂( g) + 2 H₂O( g)

What is the total number of grams of O₂( g) needed to react completely with 4.0 mole of C₂H₂( g)?

• 320g O₂

• 160g O₂

• 25.6g O₂

• 12.8g O₂

Tags

NGSS.HS-PS1-7

Remy added concentrated HCl solution in excess to 48.6 grams of magnesium metal and collected the hydrogen gas that was produced by the reaction.

Mg( s) + 2 HCl( aq) → MgCl₂ aq) + H₂( g)

If Justin collected 1.5 grams of H₂, what was the percent yield of H₂?

• 0.375 %

• 37.5%

• 75%

• 18.75%

Tags

NGSS.HS-PS1-7

Fe₂O₃ + 2 Al → 2 Fe + Al₂O₃ ,

What mass of Iron (III) Oxide must be used to produce 7 grams of Iron?

• 10g Fe₂O₃

• 40g Fe₂O₃

• 7g Fe₂O₃

• 160g Fe₂O₃

Tags

NGSS.HS-PS1-7

2H₂ + O₂ --> 2H₂O

What is the mole ratio of O₂ consumed to water produced?

• 1 mol O₂/ 2 mol H₂O

• 2 mol O₂ / 1 mol H₂O

• 2 mol O₂ / 2 mol H₂O

Tags

NGSS.HS-PS1-7

K ₃PO ₄( aq) + 3 AgNO ₃( aq) → Ag₃PO ₄( s) + 3 KNO ₃( aq)

In the laboratory, Melinda mixed together solutions of 35.3g of K₃PO ₄ and 37.7g of AgNO₃. She is interested in making the product Ag₃PO ₄. What is the limiting reactant, and how much Ag ₃PO ₄ will be produced?

• K₃PO ₄ is the limiting reactant, 93 grams of Ag ₃PO ₄ were formed.

• K₃PO ₄ is the limiting reactant, 31 grams of Ag ₃PO ₄ were formed.

• AgNO₃ is the limiting reactant, 93 grams of Ag ₃PO ₄ were formed.

• AgNO₃ is the limiting reactant, 31 grams of Ag ₃PO ₄ were formed.

Tags

NGSS.HS-PS1-7

What is the ratio between the coefficients of any two substances in a balanced equation?

• molar mass balanced equation

• mole ratio

• quadratic equation

• chemical formula