.
(c) Define
the term molecular mass.
(d)
Determine the molecular mass of 
[Atomic mass
of Zn = 65 u, S = 32 u, 0 = 16 u],
(e) Calculate the
number of molecules of carbon dioxide, 
present
in 4,4 g of .
Answer:
(a) 1 mole of iron
(Fe) = 56 g (molar mass)
56g of Fe = 1 mol
112 g of 
(b) Molar
mass of 
= 12 x 12 +
22 x 1 + 11 x 16 =342 g
1 mole of sugar = 342 g of
sugar
0.5 mole of sugar =342 x
0.5= 171 g
(c)
Molecular mass It is the sum of the atomic masses of all the atoms in a molecule
of the substance.
(d) 
= 161
g
(e) Molar
mass of 
44g of 
contains 6.022 x 1023
molecules
4.4 e of contains 
= 6.022 x 1022
molecules
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