Chemistry Class Additional Practice Problems Solutions
Practice solving chemistry problems involving moles, atoms, and compounds. Calculate the mass in grams of various substances and determine the number of atoms in different moles. Check your answers to sharpen your understanding.
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ADDITIONAL PRACTICE PROBLEM SOLUTIONS From chemistry class 3/30
ADDITIONAL PRACTICE PROBLEMS How many moles are equal to 9.03 x 1024atoms of mercury? 1. How many atoms are in 1.00 mole of sucrose, C12H22O11? How many atoms of O are in 3.65 moles of C12H22O11? 2. 3. 2
ANSWERS TO PRACTICE PROBLEMS 1. 9.03 x 1024 atoms x 1 mole 1 6.02 x 1023 atoms = 15.0 moles 2. 1.0 mole x 6.02 x 1023 mlcs x 45 atoms 1 1 mole = 2.71 x 1025 atoms 1 mlc 3. 3.65 mol x 6.02 x 1023 mlcs x 11 atoms of O 1 1 mole = 2.42 x 1025 atoms O 1 mlc C12H22O11 3
ADDITIONAL PRACTICE PROBLEMS 1. What is the mass, in grams, of 1.72 mol CaCl2? 2. Determine the mass of one mole of each of the following compounds and give their names. (Fill in the chart) 4
ANSWERS TO PRACTICE PROBLEMS 1. 1.72 mol x 110.98 g 1 1 mol = 190.89 g 5
ANSWERS TO PRACTICE PROBLEMS Compound Mass in One Mole 44.01 g Name carbon dioxide a. CO2 b. SO3 c. NaOH d. Al2(SO4)3 e. Ba(NO3)2 80.07 g sulfur trioxide 40.01 g sodium hydroxide 342.17 g aluminum sulfate 261.35 g barium nitrate 6
ADDITIONAL PRACTICE PROBLEMS Calculate the mass in grams for 0.250 mol of each of the following compounds: a. sucrose (C12H22O11) b. sodium chloride c. potassium permanganate 1. 7
ANSWERS TO PRACTICE PROBLEMS Calculate the mass in grams for 0.250 mol of each of the following compounds: a. sucrose (C12H22O11) 0.250 mol x 342 g = 85.50 g C12H22O11 1 1 mol 1. sodium chloride 0.250 mol x 58.5 g = 14.63 g NaCl 1 1 mol b. potassium permanganate c. 0.250 mol x 158 g = 39.50 g KMnO4 1 1 mol 8
