Chemical Bonding Worksheet With Answers
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122.3 (a) How many grams are there in one amu of a material?
(b) Mole, in the context of this book, is taken in units of gram-mole. On this basis, how many atoms
are there in a pound-mole of a substance?
Solution
(a) In order t o det ermine t he num ber of gram s i n one am u of material, appropriate manipulation of the
amu/atom, g/mol, and atom/mol relationships is all that is necessary, as
⎛
⎞
⎛
⎞
1 mol
1 g / mol
# g/amu =
⎜
⎟
⎜
⎟
23
⎝
⎠
⎝
1 amu / atom
⎠
6.022 × 10
atoms
-24
= 1.66 × 10
g/amu
(b) Since there are 453.6 g/lb
,
m
23
1 lb - mol = (453.6 g/lb
) (6.022 × 10
atoms/g - mol)
m
26
= 2.73 × 10
atoms/lb-mol
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