need help on daltons law of partial pressure problem?

  • Thread starter Thread starter ~~xx{Stelth[k9]}xx~~
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~~xx{Stelth[k9]}xx~~

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well it gives me like 10 of these problems so i just need to know how to do 1 and im set. What im most confused about is what equation to use

so it says: Some hydrogen gas is collected over water at 20 degrees celcius. The levels of water inside and outside the gas collection bottle are the same. The partial pressure of hydrogen is 742.5 torr. what is the barometric pressure at the time the gas is collected?
 
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