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Questions and Answers
What is the percentage atom economy in forming ethene by the given reaction?
What is the percentage atom economy in forming ethene by the given reaction?
- 83.1%
- 28.3% (correct)
- 49.8%
- 16.5%
Calculate the molar mass of hydrogen chloride (HCl).
Calculate the molar mass of hydrogen chloride (HCl).
- 71.5 g/mol
- 37 g/mol
- 1 g/mol
- 36.5 g/mol (correct)
In a chemical reaction, 5.8g of water (H2O) is produced. If the molar mass of water is 18 g/mol, how many moles of water were produced?
In a chemical reaction, 5.8g of water (H2O) is produced. If the molar mass of water is 18 g/mol, how many moles of water were produced?
- 7 moles
- 0.322 moles (correct)
- 0.64 moles
- 5.8 moles
A solution of ZnSO4 has a concentration of 0.045963 mol/L. What volume of the solution contains 2 moles of ZnSO4?
A solution of ZnSO4 has a concentration of 0.045963 mol/L. What volume of the solution contains 2 moles of ZnSO4?
Calculate the percentage yield if the expected yield is 10g and the actual yield obtained is 7g.
Calculate the percentage yield if the expected yield is 10g and the actual yield obtained is 7g.
In a titration, if it took 25mL of a 0.1 M NaOH solution to neutralize 30mL of an unknown HCl solution, what is the concentration of the HCl solution?
In a titration, if it took 25mL of a 0.1 M NaOH solution to neutralize 30mL of an unknown HCl solution, what is the concentration of the HCl solution?
What is the molar ratio between NaOH and HCl in the given reaction?
What is the molar ratio between NaOH and HCl in the given reaction?
In the reaction, if 0.045 moles of NaOH were used, what would be the volume of HCl needed to neutralize it?
In the reaction, if 0.045 moles of NaOH were used, what would be the volume of HCl needed to neutralize it?
What is the theoretical yield of NaCl if 2.0 g of NaOH and excess HCl are used in the reaction?
What is the theoretical yield of NaCl if 2.0 g of NaOH and excess HCl are used in the reaction?
If the percentage yield for a reaction is 85%, what would be the actual yield if the theoretical yield is 6.5 g?
If the percentage yield for a reaction is 85%, what would be the actual yield if the theoretical yield is 6.5 g?
Given that the molar mass of O₂ is 32 g/mol, how many moles of O₂ are produced from 4.0 g of KClO₃?
Given that the molar mass of O₂ is 32 g/mol, how many moles of O₂ are produced from 4.0 g of KClO₃?
If a reaction has a theoretical yield of 18 g and an actual yield of 15 g, what is the percentage yield?
If a reaction has a theoretical yield of 18 g and an actual yield of 15 g, what is the percentage yield?
What is the rearranged equation for percentage yield?
What is the rearranged equation for percentage yield?
What is the first step in calculating the percentage yield of a reaction?
What is the first step in calculating the percentage yield of a reaction?
In the given reaction, how many grams of magnesium oxide should theoretically be produced?
In the given reaction, how many grams of magnesium oxide should theoretically be produced?
What does atom economy reflect in a chemical reaction?
What does atom economy reflect in a chemical reaction?
How can you calculate the mass of a product in a chemical reaction?
How can you calculate the mass of a product in a chemical reaction?
What step is essential in determining the percentage yield using the rearranged equation?
What step is essential in determining the percentage yield using the rearranged equation?
Study Notes
Calculating Percentage Yield
- Rearrange the percentage yield equation to: Actual yield = (% yield / 100) x theoretical yield
- Use this rearranged equation to calculate the actual yield
Worked Exam Style Question
- Given the equation: 2Mg + O2 → 2MgO
- Calculate the percentage yield of the reaction, given that burning 2.32 g of magnesium produced 2.39 g of magnesium oxide
- Steps:
- Work out the number of moles of magnesium
- Calculate the theoretical yield of magnesium oxide
- Calculate the percentage yield
Atom Economy
- Atom economy reflects the efficiency of a reaction producing the desired product
- Calculate atom economy using the equation: Desired product / (Desired product + By-product) x 100
- Example 1: Calculate the atom economy for the reaction producing Mg(OH)2
- Desired product = Mg(OH)2, Mr = 58
- By-product = NaCl, Mr = 58.5
- Atom economy = 58 / 116.5 = 49.8%
Worked Exam Style Questions
- Calculate the atom economy for the reaction forming ethene: C12H26 → C10H22 + C2H4
- Steps:
- Work out the molecular mass of ethene
- Work out the molecular mass of decane
- Calculate the atom economy
- Steps:
Example Questions
- Calculate the atom economy for the reaction producing hydrogen chloride
- Steps:
- Work out the molecular mass of hydrogen chloride
- Use the atom economy equation to calculate the atom economy
- Steps:
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Description
This quiz covers the calculation of percentage yield in a chemical reaction scenario. It involves rearranging the percentage yield equation and substituting values to find the actual yield. The specific question provided involves calculating the percentage yield of a reaction between magnesium and oxygen.
