University:
High School
Course:
High School Chemistry
Academic year:

2022
Views:

89

Pages:

2
Author:

Clint W.

Name:_________________ Per:____ Mole Review Practice Problems (Must show all your work and units!) I. Write the conversion factors used to convert between the following units. Grams -------------------------- Moles ------------------------- Atoms II. Determine the molar mass of the following atoms and compounds: 1. S 2. KCl 3. Na2SO4 4. N2 5. Ca(NO3)2 III. Determine the number of moles in each of the quantities below (Use Dimensional Analysis) 1. 12 g of S 2. 25g of KCl 3. 125 g of Na2SO4 4. 100 g of N2 5. 1.20 X 1024 Atoms of Ca(NO3)2 IV. Determine the number of grams in each of the quantities below. 1. .345 mole of water 2. 2.5 moles of KCl 4. 6.35 moles of N2 3. 3.34 mole Na2SO4 5. 3.01 x 1023 Atoms of Ca(NO3)2 V. General 1. Which contains more atoms, a mole of copper or a mole of gold? (write down # in each one) 2. Which weighs more, a mole of copper or a mole of gold? (write down how much each one weighs) 3. How many molecules are in: (Show answer) a) 17.0 g of ammonia, NH3 b) 36.4 g of hydrogen chloride, HCl? Mole Ratios (show all work for math) 1. 2 H2 (g) + O2 (g)  2 H2O (l) a. Write all the mole ratios that exist in the reaction b. Assume there were 6 molecules of H2 reacting (vs. just 2). Make a drawing showing 6 molecules of H2 with the correct # of O2 needed. Also, show how many H2O’s are produced. 2a. Balance the following: a. ___N2 + ___H2 ___NH3 Write all the mole ratios that exist in the reaction b. How many moles of hydrogen are needed to completely react with two moles of nitrogen? 3a. Balance the following: a. ___KClO3 ___ KCl + ___O2 Write all the mole ratios that exist in the reaction b. How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 4a. Balance the following: a. ___Zn + ___HCl  ___ZnCl2 + ___H2 Write all the mole ratios that exist in the reaction b. How many moles of hydrogen are produced from the reaction of three moles of zinc with an excess of hydrochloric acid? 5a. Balance the following: ___C3H8 + ___O2  ___CO2 + ___H2O a. Write all the mole ratios that exist in the reaction b. How many moles of oxygen are necessary to react completely with four moles of propane (C 3H8)?