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Mole Concept & Avogadro Number

Find the rati...

Question

Find the ratio by mass of combining element in the following compounds.
a) $C O_{2}$
b) $N H_{3}$
(If $C = 12$ u, $O - 16$ u, and $H = 1$ u)

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Solution

$a) R a t i o b y m a s s o f C O_{2} = m a s s o f C i n m o l e c u l e : m a s s o f O i n m o l e c u l e$
$= 12 : (16 \times 2)$
$= 12 : 32$
$= 3 : 8$
$b) R a t i o o f m a s s o f N H_{3} = m a s s o f N i n m o l e c u l e : m a s s o f H i n m o l e c u l e$
$= 14 : (1 \times 3)$
$= 14 : 3$

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