Unit 4-5 Test Review

How many atoms or particles are in a mole?

• 12.01

• 6.022 x 10²³

• 22.4

• 1.008

How many grams of Carbon are in 1 mole of Carbon?

• 1.008 g

• 16.00 g

• 24.02 g

• 12.01 g

How many grams are in 1 mole of Oxygen Gas?

• 2.016 g

• 16.00 g

• 24.02 g

• 32.00 g

How many different elements are present in H₂COCH₂

• 5

• 4

• 3

• 2

Calculate the number of Oxygen atoms in Al(OH)₃

• 1

• 2

• 3

• 4

C₃H₅(NO₃)₃

• C = 3, H = 5, N = 3, O = 9

• C = 3, H = 5, N = 1, O = 9

• C = 9, H = 15, N = 3, O = 9

• C = 9, H = 15, N = 1, O = 3

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

What is the percent by mass of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Find the percent composition of Cu₂S?

• %Cu= 67.99 %S= 32.01

• %Cu= 79.85   %S= 20.15

• %Cu= 35.95   %S= 64.05