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Tuesday, October 19, 2021
Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one- half of the hydrogen to escape.
What volume of 75% alcohol by weight (d=0.80g/cm3) must be used to prepare 150cm3 of 30% alcohol by weight (d=0.90g/cm3)?
As par question mass of alcohol is same in both solutions. Consider V ml of alcohol required.
Then
75/100×0.8×V=30/100 ×0.9×150
V=67.5mL
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Saturday, October 16, 2021
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