Stoich Review 2

What is the ratio called made by using the coefficients in the balanced equation?

• Mole Ratio
• Stoichiometry
• Balanced
• Molar Mass

Tags

NGSS.HS-PS1-7

4.3 grams of sodium reacts with 2.6 grams of oxygen to produce 5.9 grams of sodium oxide.  What's the limiting reactant?

• Na
• NaO
• O2

Tags

NGSS.HS-PS1-7

1) Which is an acceptable fraction (mole ratio) when converting 16 moles of HCl to moles of H₂SO₄? Look at the image attached.

2 HCl + 1 Na₂SO₄ → 2 NaCl + 1 H₂SO₄

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2) How many moles of O₂ (g) are needed to react completely with 12.0 moles of Cr (s) in order to form Cr₂O₃(s)?

4 Cr _(s) + 3 O_2(g) → 2 Cr₂O_3(s)

• 12 mol O₂

• 16 mol O₂

• 9 mol O₂

• 6 mol O₂

10) Use the equation below to answer the following question:

4 FeS₂ + 11 O₂ → 2 Fe₂O₃ + 8 SO₂

The theoretical yield of Fe₂O₃ is 28.35 g. If 22.68 g of Fe₂O₃ is produced from the reaction shown above, what is the percent yield of Fe₂O₃?

• 0.8 %

• 1.25 %

• 80%

• 125%

5) If you’re given 50 grams of Hg(OH)₂, how many grams of H₂O do you make?

1 Hg(OH)₂ + 2 HBr → 2 H₂O + 1 HgBr₂

• 3.8 g Hg(OH)₂

• 1.9 g Hg(OH)₂

• 7.6 g Hg(OH)₂

• 328.6 g Hg(OH)₂

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

Tags

NGSS.HS-PS1-7

2CO  +  O₂  −-> 2CO₂
How many liters of carbon dioxide are produced from 10L of carbon monoxide?

• 10
• 20
• 1
• 5

Tags

NGSS.HS-PS1-7

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

Tags

NGSS.HS-PS1-7

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction