Chemistry Practice Problems Standard Temperature and Pressure Practice Problems Solution: A mixture of hydrogen and helium is 25.0% hydrogen...

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Solution: A mixture of hydrogen and helium is 25.0% hydrogen by mass. What is the partial pressure of hydrogen (in atm) in the mixture at STP?a) 0.460b) 0.399c) 0.520d) 0.250e) 0.380 

Problem

A mixture of hydrogen and helium is 25.0% hydrogen by mass. What is the partial pressure of hydrogen (in atm) in the mixture at STP?

a) 0.460

b) 0.399

c) 0.520

d) 0.250

e) 0.380