 # Various UF Problems

Level 1 Problems:

A single-step molar mass problem: What is the mass of 12 moles of CaCl2?

A single-step mole ratio problem:  How many moles of water can I get if I start with 3 moles of oxygen? (Must write and balance the synthesis equation for water in order to solve this.)

A single-step molarity problem:  How many moles of HCl are in 2.5 L of a 3M solution?

Lots of Level 4 unit factoring problems (from our old worksheets, quizzes and practice questions)  - PARTIAL LIST

*Some require that you predict and balance an equation.

1. If 75 moles of sodium hydroxide in solution are reacted with aqueous hydrogen chloride, how many grams of water can theoretically be produced?
2. If 20 grams of copper (II) chloride are reacted with silver nitrate, how many grams of solid product are produced?
3. If 60 grams of copper are reacted with silver nitrate, how many grams of solid product are produced?
4. If 100 grams of lead (II) nitrate in solution are reacted with aqueous potassium chloride, how many grams of insoluble product can theoretically be produced?  (Assume all lead (II) nitrate reacts and there is enough potassium chloride to complete the reaction.)
5. If 6 moles of ammonium nitrate in solution are reacted with aqueous potassium chloride, how many grams of insoluble product can theoretically be produced?
6. In the single displacement between zinc and silver nitrate, how many grams of metal product can be obtained if you start with 40 grams of zinc? (Assume all molecules react and reaction runs to completion.)
7. Sodium hydroxide and iron (II) chloride react in a double displacement. How many grams of insoluble product are produced when starting with 100 grams of sodium hydroxide?
8. Lead (II) nitrate and hydrogen chloride react in a double displacement. How many grams of insoluble product are produce when starting with 100 grams of hydrogen chloride?
9. Calcium chloride and silver nitrate are involved in a double displacement reaction.  How much solid product will be formed if we start with 40 grams of calcium chloride?
10. Over time hydrogen peroxide decomposes into water and oxygen.  How many moles of oxygen gas could I theoretically get by decomposing 350 grams of hydrogen peroxide?
11. Six moles of silver nitrate are added to an amount of zinc chloride and a precipitate forms.  Assuming all silver nitrate reacts, how many grams of solid product will you have?

Fe(s) + Cu(NO3)2(aq) → Fe(NO3)2(aq) + Cu(s)

1. Starting with 10 moles of iron, how many moles of copper can I get?
2. Starting with 10 moles of iron, how many grams of copper can I get?
3. Starting with 16 g of iron, how many grams of copper can I get?
4. Starting with 16 grams of iron, how many moles of iron (II) nitrate can I get?
5. Starting with 16 grams of iron, how many grams of iron (II) nitrate can I get?

1. Barium chloride and silver nitrate are involved in a double displacement reaction.  How much solid product will be formed if we start with 200 grams of barium chloride?
2. How many moles of HCl are dissolved in 50 ml of a 2M solution of HCl?
3. How many grams of zinc will react with 50 ml of a 2M solution of HCl?  Hint: You will have to write and balance the single displacement reaction to get mole ratios.
4. If you react 50 grams of zinc with 50 grams of HCl, which will run out first?
5. I have made a solution of potassium chloride by dissolving 1 mole of potassium chloride into enough water to make one liter.  If I now take 250 milliliters from that solution, how many grams of potassium chloride will I have dissolved in the water?
6. I have made a solution of potassium chloride by dissolving 1 mole of potassium chloride into enough water to make one liter.  If I now take 250 milliliters from that solution, how many moles of chloride ions will I have dissolved in the water?
7. How many grams of sodium hydroxide will be required to neutralize 100 ml of a 1M hydrogen chloride solution?
8. If 20 grams of copper (II) chloride are reacted with silver nitrate, how many grams of solid product are produced?
9. If you react 50 grams of zinc with 50 grams of HCl, how many moles of zinc chloride can you get?

These are taken from worksheets and quizzes we have done in class.  Most of these are level 4, but they may not all cover all three concepts: molar mass, mole ratio and molarity.  It is not required that you use any of these equations; you may make up or find your own.