Stoichiometry: Homework Help Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1. 3.9g of potassium reacts with water to produce potassium hydroxide and hydrogen gas. Calculate the mass of potassium hydroxide produced.

Question 2 2. Which of the following mole ratio is NOT appropriate to the equation 6CO2+ 6H2 O = C6 H12 O6+ 6O2?

Question 3 3. If 4.0 moles of HCl react with 5.0 moles of NaOH to make NaCl and H2 O in the equilibrium reaction HCl+ NaOH = NaCl + H2 O, what is the limiting reactant?

Question 4 4. What is the percent composition of H₂SO₃?

Question 5 5. Select the most suitable definition for stoichiometry.

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Question 6 6. If 2.5 moles of zinc react with 6.0 moles of hydrochloric acid in the equation Zn + 2HCl = ZnCl2 + H2, what is the limiting reactant?

Question 7 7. How many moles of solute are in a 0.50 L solution of 3.0 molarity?

Question 8 8. If there are three moles of H2 O for every one mole of LiClO4, then what is the hydrate formula?

Question 9 9. How is a mole ratio used?

Question 10 10. Which of the following equations is balanced?

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Question 11 11. You conduct an experiment that requires the creation of an ammonia solution. You do this by reacting 50.0 L of nitrogen gas with excess hydrogen gas at STP to create ammonia gas using the Haber process given by the following reaction: N2 (g) + 3H2 (g) → 2NH3 (g). Assuming the reaction had 100% yield, you then bubble the ammonia into 5.0 L of water. What is the molarity of the resulting ammonia solution?

Question 12 12. How many moles of N2 are needed to produce 18 moles NH3 in the reaction N2 + 3H2 = 2NH3?

Question 13 13. The starting point of a stoichiometric problem is _____.

Question 14 14. What is the actual yield?

Question 15 15.

Choose the correctly balanced equation for the following reaction:

Sodium + water → sodium hydroxide + hydrogen gas

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Question 16 16. What is the hydrate formula when there are 0.02 moles BaCl2 and 0.04 moles H2 O?

Question 17 17.

Choose the correctly balanced equation for the following reaction:

Potassium + water → potassium hydroxide + hydrogen gas

Question 18 18. At STP, how much space (in liters) will 0.750 moles of argon gas occupy?

Question 19 19. Determine the percent yield if the theoretical yield is 20 g and the actual yield is 15 g.

Question 20 20. What is NOT a step in determining the formula of a hydrate?

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Question 21 21. Given a balanced equation involving A and B, which set of conversions must you make to change mass A to mass B?

Question 22 22. What is the empirical formula of a compound containing (by mass) 36.5% sulfur and 63.5% iron?

Question 23 23. What is meant by the term molar volume?

Question 24 24. Say you take a reactant A and calculate the amount of moles of another reactant B required to use up all of A. How do you know which of two reactants is the limiting one?

Question 25 25. How do you determine the amount of product made?

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Question 26 26. What is a limiting reactant?

Question 27 27. What is the volume of 2 moles of a gas at 300K and 1.25atm?

Question 28 28. Conservation of matter means that:

Question 29 29. What is the percent composition of Cu₂S?

Question 30 30. Determine the actual yield if the theoretical yield is 12 g and the percentage yield is 90%.

Stoichiometry: Homework Help Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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