Chem Stoichiometry Composite

If 3.29 x 10²³ atoms of potassium react with excess water, how many liters of hydrogen gas would be produced at STP?
2 K + 2 H₂O -->  2 KOH + H₂

• 6L
• 5L
• 4L
• 3L

Tags

NGSS.HS-PS1-7

The first step in stoichiometry is to

• Determine a balanced equation
• convert grams to moles
• convert grams to liters
• use the mole ratio

Tags

NGSS.HS-PS1-7

What is stoichiometry?

• The study of how the quantities of reactants and products are related in chemical reactions
• The study of the speed of reactions
• The study of how chemical reactions occur
• The study of types of reactions

2 CO (g) + O₂(g) → 2 CO₂ (g)
In the formation of CO₂ from CO and oxygen, how many Liters of CO₂ are produced by the reaction of 8 mols of O₂ with an excess of carbon monoxide?

• 0.178 L
• 358.4 Liters
• 704 grams
• 0.36 grams

Tags

NGSS.HS-PS1-7

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

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

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

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

0.157 g of C₆H₇NO was used to react with 0.486 g of C₄H₆O₃ to produce C₈H₉NO₂ and CH₃COOH. After purification, 0.198 g of C₈H₉NO₂ was extracted. Determine the percentage yield of C₈H₉NO₂. [Ar C : 12.O; H=1.0; N=18; O=16.0]

• 70.09%
• 85.62%
• 91.24%
• 90.90%

290.23 mg of ethanol (C₂H₅OH) is reacted with excess oxygen (O₂) to provide 481.11 mg of CO₂. What is the percentage yield of CO₂ in this reaction?

• 90.0 %
• 86.7 %
• 67.8 %
• 77.8 %