chemistry

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I need to calculate the pressure exerted by the hydrogen in an eudiometer for a weighing by redox lab.

mass of Mg: .021 g
temp: 295K
barometric pressure: 29.87 inches Hg
volume of H2 gas:

the difference between tiop water level in eudiometer = 322 mm
the difference in the top water level = 165 mm

How do I start this?

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