Stoichiometry Test

4NH₃ + 5O₂ --> 4NO + 6H₂O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen? 

• 0.37g
• 0.045g
• 1.35g
• 11.1g

Tags

NGSS.HS-PS1-7

CH₄ + 2H₂O --> CO₂ + 4H₂

What is the limiting reactant when 20g CH₄ and 15g H₂O are combined? (CH₄ = 16.05 g/mol; H₂O = 18.02 g/mol)

• CH₄

• H₂O

• CO₂

• H₂

Fe + S --> FeS

If 7.62g Fe and 8.67g S are combined, what is the limiting reactant? (Fe = 55.85 g/mol; S = 32.07 g/mol)

• Fe

• S

• FeS

• none

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂ --> 4NO + 6H₂O

How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen? (Ar=14, O=16, H=1)

• 0.37g

• 0.045g

• 1.35g

• 11.1g

P₄ + 6Cl₂ --> 4PCl₃

The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃ in lab. Find the theoretical yield and calculate percent yield for the reaction. (Ar P=31, Cl = 35.5)

• 78%

• 64%

• 27%

• 33%

Tags

NGSS.HS-PS1-7

3NH₄NO₃ + Na₃PO₄ --> (NH₄)₃PO₄ + 3 NaNO₃

Assuming we start with 30 g of NH4NO3 and 50 g of Na3PO4, identify the limiting reactant.

• ammonium phosphate

• sodium phosphate

• ammonium nitrate

• sodium nitrate

Tags

NGSS.HS-PS1-7

3NH₄NO₃ + Na₃PO₄ --> (NH₄)₃PO₄ + 3 NaNO₃

How much of the excess reagent is left over after the reaction is complete?

• 12 g of sodium phosphate

• 29.5 g of sodium phosphate

• 17 g of ammonium nitrate

• 95 g of ammonium phosphate

Tags

NGSS.HS-PS1-7

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

Assuming we start with 100 g of CaCo3 and 45 g of FePO4, identify the limiting reagent.

• iron(V) phosphate

• calcium carbonate

• iron(III) phosphate

• calcium(II) carbonate

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

What is the maximum amount of each product that can be formed?

• 85 g of calcium carbonate, 39 g of iron(III) phosphate

• 12.4 g of calcium phosphate, 27 g of iron(III) carbonate

• 37.2 g of calcium phosphate, 29.3 g of iron(III) carbonate

• 46.3 g of calcium phosphate, 43.8 g of iron(III) carbonate

Tags

NGSS.HS-PS1-7

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

How much of the excess reagent is left over after the reaction is complete?

• 57.3 g of sodium phosphate

• 54.0 g of calcium carbonate

• 25 g of calcium carbonate

• 16.9 g of iron(III) carbonate

Tags

NGSS.HS-PS1-7