0.25 g of an organic compound " A " containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of 
tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g , respectively. The percentage of oxygen in compound A is %. (Nearest integer)
(Given: molar mass in 
)
Text Solution
Verified by Experts73
(73)
In combustion analysis: 
tube absorbs 
and potash tube absorbs 
.
Mass increase of 
gives moles of 
, so moles of
and mass of 
.
Mass increase of potash 
gives moles of 
, so moles of 
and mass of 
.
Mass of 
.
Percentage of 
(nearest integer).
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