C3: Quiz 3
1) The Ar of helium (He) is 4. Answer the following:
a) Find the mass of 1 mole of helium.
b) Find the mass of 2 moles of helium.
c) Find the mass of 5 moles of helium.
d) Find the mass of 8 moles of helium.
e) Find the mass of 0.5 moles of helium.
2) The Ar of silicon (Si) is 28. Answer the following:
a) Find the mass of 1 mole of silicon.
b) Find the mass of 3 moles of silicon.
c) Find the mass of 0.8 moles of silicon.
d) Find the mass of 0.1 moles of silicon.
3) Carbon dioxide is CO2.
C = 12, O = 16
a) Find the relative formula mass (Mr) of CO2.
b) Find the mass of 4 moles of carbon dioxide.
c) Find the mass of 0.3 moles of carbon dioxide.
d) How many moles are there in 88 g of carbon dioxide?
e) How many moles are there in 33 g of carbon dioxide?
4) Iron (III) oxide is Fe2O3.
Fe = 56, O = 16
a) Find the relative formula mass (Mr) of Fe2O3.
b) How many moles are there in 40 g of iron (III) oxide?
c) How many moles are there in 600 g of iron (III) oxide?
d) Find the mass of 0.15 moles of iron (III) oxide.
e) Find the mass of 2.6 moles of iron (III) oxide.
5) The formula for propane is C3H8.
C = 12, H = 1
How many moles of propane are there in 19.8 g of propane?
6) 27 g is 3 moles of an unknown element.
a) Find the relative atomic mass of the unknown element.
b) Use the periodic table to predict which element this unknown element is.
7) 36 g is 0.3 moles of an unknown molecule.
Find the relative formula mass of this molecule.
8) 31.2 g is 0.65 moles of an unknown element.
a) Find the relative atomic mass of the unknown element.
b) Use the periodic table to predict which element this unknown element is.
9) The formula for glucose is C6H12O6.
C = 12, H = 1, O = 16
Find the mass of 0.28 moles of glucose.
10) One mole is 6.022 x 1023 number of atoms or molecules.
Let’s now suppose that we have water.
a) How many water molecules will there be in 4 moles of water? Give your answer in standard form.
b) How many water molecules will there be in 0.7 moles of water? Give your answer in standard form.
11) How many molecules of H2SO4 are there in 294 g of H2SO4?
H = 1, S = 32, O = 16
12) Find the mass of 0.45 moles of Ca3(PO4)2.
Ca = 40, P = 31, O = 16