Unit 3B Moles Test

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Unit 3B Moles Test

Mrs. Harris

Email *

What is the %C in C2H4? *

1 point

50.0%

62.4%

85.7%

33.3%

How many atoms of mercury (Hg) are in 42.8g? *

1 point

7.11 X 10^-23 atoms

2.54 X 10^-25 atoms

1.50 X 10^24 atoms

1.28 X 10^23 atoms

The molecular formula for a compound is a multiple of the empirical formula. *

1 point

True

False

What is the molar mass of potassium sulfate, K2SO4? *

1 point

86g

174.27g

17427 X 10^23 g

158.27g

How many formula units are in 1.00 moles of lithium bromide, LiBr? *

1 point

86.84 formula units

22.4 formula units

6.02 X 10^23 formula units

none of the above

One mole of water weighs *

1 point

3.00g

10.00g

180.2g

18.02g

Hydroquinone is an organic molecule commonly used as a photographic developer. Its molecular mass is approximately 110g. It has a composition of 65.45% C, 5.45% H, and 29.09% O. Calculate the molecular formula for hydroquinone. *

1 point

C3H3O

CH2O

C6H6O2

C4H4O2

How many liters (L) of O2 gas are in 2.90 X 10^18 molecules? *

1 point

0.000108 L

465000 L

0.0000868 L

3.60 X 10^18 L

If a compound, X2Y is 60% X by mass, what % is Y? *

1 point

40%

60%

30%

20%

Which represents the greatest mass? *

1 point

1.0 mol Zn

1.0mol Ge

1.0 mol Al

1.0 mol Fe

1.0 mole of any gas at STP contains *

1 point

22.4L

6.02 X 10^23 L

100.L

1.0 L

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