Unit 7 Test: The Mole - 8th Period

Find the molar mass of MgSO₄. You must show your work on your paper.

• 120 g/mol

• 118 g/mol

• 115 g/mol

• 125 g/mol

Find the molar mass of CaCO₃. You must show your work on your paper.

• 68 g/mol

• 100 g/mol

• 217 g/mol

• 99 g/mol

What is the mass of 6 moles NaOH? Hint: This is a one-step problem. You are going from moles to grams. Don’t forget to find the molar mass. Use your mole map.

• 120 grams

• 240 grams

• 360 grams

• 480 grams

How many molecules (atoms/particles) are in 54 moles of MgO? You must show your work on your paper.

• 3.25 E 25 molecules

• 3.25 E 24 molecules

• 3.25 E 23 molecules

• 3.25 E 22 molecules

Tags

NGSS.HS-PS1-7

Convert 8.4 grams of O₂ to moles. Hint: This is a one-step problem. You are going from grams to moles. Don’t forget to find molar mass. Use your mole map. You must show all of your work on your paper.

• 0.2625 moles

• 0.525 moles

• 0.105 moles

• 0.210 moles

Find the mass (grams) of 4.00 x 10²¹ molecules of N₂. Hint: You are going from atoms to grams. This is a two-step problem. You must show all of your show on the paper.

• 0.186 grams

• 0.232 grams

• 0.372 grams

• 0.464 grams

How many atoms are in 5.78 grams of NO₂? This is a two step problem. You must show all of your work on your paper.

• 1.23 E 23 atoms

• 2.34 E 23 atoms

• 3.45 E 23 atoms

• 7.56 E 22 atoms

Tags

NGSS.HS-PS1-7

Find the percent composition of Na₃PO₄. You must show all of your work on your paper.

• Na% = 14

  P% = 19

  O% = 40

• Na% = 45

  P% = 18

  O% = 37

• Na% = 50

  P% = 20

  O% = 30

• Na% = 42

  P% = 19

  O% = 39

Find the percent composition of H₃SO₄. You must show all of your work on your paper.

• H% = 2

  S% = 65

  O% = 33

• H% = 30

  S% = 32

  O% = 38

• H% = 3

  S% = 32

  O% = 65

• H% = 2

  S% = 58

  O% = 40

Find the percent composition of Na(OH)₂. You must show all of your work on your paper.

• Na% = 45

  O% = 30

  H% = 25

• Na% = 70

  O% = 24

  H% = 6

• Na% = 58

  O% = 40

  H% = 2

• Na% = 40

  O% = 56

  H% = 4