Unit 9 Review

Question #1

Write the formula for the following compound:barium carbonate

BaCO3

Question #2

How many moles of calcium are in 27.6

molecules of calcium?

4.6 x 10-23 moles

Question #3

How many formula units are in 89.6 moles of

carbon?

5.4 x 1025 formula units

Question #4

What is the molar mass of aluminum chloride?

AlCl3

133.4 g/moles

Question #5

What is the molar mass HNO2?

47 g/moles

Question #6

How many grams are in 9.06 moles of Li2SO4?

996.6 grams

Question #7

How many liters are in 31 moles of bromide gas?

694.4 L

Question #8

How many molecules are in 77 grams of BeI2?

1.76 x 1023 molecules

Question #9

How many grams are in 33.4 atoms of nitrogen

gas?

1.55 x 10-21 grams

Question #10

Calculate the percent composition for EACH

element in the compound NH3.

% N = 82.6%% H = 17.4 %

Question #11

Calculate the percent composition of

magnesium MgO.

60.3 % Mg

Question #12

Is the following compound an empirical or molecular formula?

MgO EF

Question #13

Is the following compound an empirical or molecular formula?

C4H12MF

Question #14

Is the following compound an empirical or molecular formula?

Al2O3EF

Question #15

What is the empirical formula when you

have 40% of carbon and 60% hydrogen?

CH18

Question #16

What is the empirical formula when you have:

24% carbon 48% hydrogen28% of oxygen

CH27O

Question #17

What is the molecular formula for the

compound CClN with a molar mass of 184.5

g/mol?C3Cl3H3