According to Dalton law total pressure will be 2580 PSI.
The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's partial pressures law. For instance, the total pressure exerted by a mixture of two gases A and B is equal to the sum of gas A and gas B's respective partial pressures.
Total pressure =[tex]P_{1}+P_{2}..........P_{n}........(i)[/tex]
It is given that,[tex]P_{Oxygen}= 1250 PSI, P_{Nitrogen} = 780 PSI, P_{Helium} =550PSI.[/tex]
Now, put the value of given data in above equation.
[tex]P_{Total} = P_{Oxygen}+P_{Nitrogen}+P_{Helium}[/tex]
=1250 PSI +780 PSI + 550PSI=2580 PSI
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