Qu 1 - 3: can you use the mole formula for
masses
Qu 4 - 8: Do you understand the concept of the mole
1) What is the mass
of (give your answer to 1dp) :
a)
0.1 moles of zirconium atoms Zr? 9.1g
b)
0.02 moles of Thorium atoms Th? 4.6g
c) 2.0
moles of Nickel atoms Ni?
117.4g
d)
0.1 moles of Mercury atoms Hg? 20.1g
e)
0.05 moles of Phosphorous molecules P4? 6.2g
2) Calculate the mass of
(give your answer to 1dp) :-
a)
1.0 mole of H2? 2.0g
b)
1.0 mole of H?
1.0g
c) 1.0 mole
of SiO2?
60.1g
d)
0.5 moles of NaCl? 29.3g
e)
0.25 moles of Na2CO3.10H2O? 71.5g
3) How many moles of :
a)
32g of oxygen molecules? 1.00 mole
b)
32g of oxygen atoms? 2.00 Moles
c) 31g of
phosphorous molecules P4? 0.250 Moles
d)
32.1g of sulphur molecules S8? 0.125
Moles
ALL TO 3SF (as not told otherwise)
4) The formula of Sodiumdihydrido - bis ( 2 - methoxy ethoxy)
Aluminate is abbreviated SDA for ease :
NaAlH2(OCH2CH2OCH3)2
a)
How many moles of Na atoms are there in 1 mole of SDA? 1.00 Mole
b)
How many moles of carbon are there in 1 mole of SDA? 6.00 Mole
c)
How many atoms of Al are there in 1 mole of SDA? 6.02 x 1023
d)
How many atoms of H are there in 1 mole of SDA? 16 x 6.02 x
1023 = 9.63 x 1024
e)
What is the total number of moles of atoms of all the elements in 1moIe
of SDA? 28
Moles
5) 1mole of sodium and 1
mole of iron must have the same:
Choose one
:- a) mass
b) density
c) volume
d) number of atoms e) number
of electrons
6) Which of the following
contains the greatest proportion of nitrogen by mass?
a) |
Ammonium Sulphate |
(NH4)2SO4 |
Mr =
132.1 |
b) |
Ammonium carbonate |
(NH4)2CO3 |
Mr = 96 |
c) |
Ammonium
nitrate |
NH4NO3 |
Mr = 80 |
d) |
Ammonium ethanoate |
CH3COONH4 |
Mr = 77 |
e) |
Ammonium chloride |
NH4Cl |
Mr = 53.5 |
7) The Avogodro number is
6.02 x 1023 which is the same number
as: Choose one
a)
Hydrogen atoms in 18g of water.
b)
Hydrogen molecules in 1g of
Hydrogen.
c)
Oxygen atoms in 44g of carbon
dioxide.
d)
Nitrogen
molecules in 28g of nitrogen.
8) What mass of aluminium contains the same number of
atoms as there are molecules of 22g of carbon dioxide? 13.5g