Molar Conversions 11: Test
Avagadro’s number: 6.02 X 1023 particles/mol
1) What is the correct molar mass for Al
a) 13
b) 27.0
c) +3
d) 40.0
Name:____________________________
2)
Which compound has the largest molar mass.
a) CH3COOH
b) KI
c) H2O
d) Al2O3
3)
The molar mass tells us…
a) The number of grams in every mole of that substance
b) The mass of a single mole
c) The number of protons and neutrons
d) All of the above
4)
The molar mass of NaCl
a) 28 g/mol
b) 58.5 mol/g
c) 28 mol/g
d) 58.5 g/mol
5)
The number 6.02 X 1023 tells us
a) The number of particles per gram
b) The number of particles in a sample
c) The number of particles per mole
d) All of the above
6)
A sample containing 12.04 x 1023 particles will consist of
a) 2 x 1023 grams
b) 2 x 1023 mol
c) 2 grams
d) 2 mol
7)
Which of the following is not considered a particle when using Avagadro’s
number
a) Proton
b) Atom
c) Molecule
d) Compound
Written:
Calculate the molar mass:
1) Determine the molar mass for CaO
2) Determine the molar mass of CH3COOH
3) Determine the molar mass for 3H2SO3
Balance the equation and determine the molar mass of each reactant
Ca + Al(NO3)3  Ca(NO3)2
+
Al
Reactant 1:___________________
Reactant 2:___________________
Conversions
1) Convert 12.4g of FeCl3 to moles.
2) Convert 0.897 moles of CuNO3 to grams
3) Convert 7.6 moles of HCl to particles
4) Convert 293 X 1023atoms of MgI2 to moles
5) Convert 3.72 X1024particles of Cu to grams
6) Convert 270g of H2O2 to particles
Word Problems:
1)
A block of lead weighs 200g. How many moles make up his block of gold?
2) During a double replacement reaction lead (IV) iodide reacts with potassium
sulphate.
a) Write out the balanced chemical reaction and determine the molar ratio
for the reaction.
b) If you produced 12g of Potassium iodide how many moles did you make?
3) 90% of the human body is made of water. If a person weighs 67kg
determine the number of water particles that make up this person.
4) 1 cup of water weighs 250g. If you drink a cup of water how many particles
did you take in?