Respuesta :
There were 0.166 moles of oxygen, O, in the sample.
Given:
The unknown compound with a mass of 5.00 grams.
In 5.00 grams of compound contained 0.167 moles of C and 0.333 moles of hydrogen.
To find:
The moles of oxygen in 5.00 grams of an unknown compound.
Solution:
Moles of carbon in 5.00 grams of compound = 0.167 mol
Mass of carbon in 5.00 grams :
[tex]=0.167 mol\times 12.0107 g/mol=2.01 g[/tex]
Moles of hydrogen in 5.00 grams of compound = 0.333 mol
Mass of hydrogen in 5.00 grams :
[tex]= 0.333 mol\times 1.00784 g/mol=0.336 g[/tex]
Mass of oxygen in 5.00 grams of compound:
[tex]= 5.00 g - 2.01 g - 0.336 g = 2.654 g[/tex]
Moles of oxygen in 2.654 g :
[tex]=\frac{2.654 }{15.999 g/mol} \\\\=0.1658 mol\approx 0.166 mol[/tex]
There were 0.166 moles of oxygen, O, in the sample.
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