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29/12/2020 10:39 am
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The ratio by mass for hydrogen and oxygen in water is given as 1 : 8 respectively. Calculate the ratio by number of atoms for a water molecule.
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29/12/2020 10:43 am
The ratio by number of atoms for a water molecule are:
Element
H
O
Ratio by mass
1
8
Atomic mass
1
16
\(\frac{Mass\, ratio}{Atomic\, mass}\)
\(\frac{1}{1}\) = 1
\(\frac{8}{16}\) = \(\frac{1}{2}\)
Simplest ratio
2
1
Thus, the ratio by number of atoms for water is H : O = 2 : 1.