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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: txxplc110 on June 16, 2020, 05:07:26 AM

Title: calculation: mass of oxygen in water
Post by: txxplc110 on June 16, 2020, 05:07:26 AM

I have mixed feelings about latest calculation task that I got:

20m3 of water was saturated with oxygen at a temperature of 8°C and a pressure of 1800 hPa. Calculate the mass of oxygen that will release when heated to 20°C and pressure changes to normal.

Can someone help me find good way to solve it, please? :)

Title: Re: calculation: mass of oxygen in water
Post by: Borek on June 16, 2020, 06:47:18 AM

What laws governing gases solubility do you know?

Title: Re: calculation: mass of oxygen in water
Post by: txxplc110 on June 16, 2020, 06:53:09 AM

Quote from: Borek on June 16, 2020, 06:47:18 AM

What laws governing gases solubility do you know?

Henry's law. But I don't know how to use it so that is my problem

Title: Re: calculation: mass of oxygen in water
Post by: Borek on June 16, 2020, 11:06:43 AM

Are you sure it is a HS level problem?

Henry's law is OK, but it will give only part of the answer. As far as I am aware for the other part (T) you need solubility tables (or thermodynamic data that will allow to estimate the solubility change).