An Oxygen Tank Kept at 20 ^$\circ$ C Contains 28

question 49

Multiple Choice

An oxygen tank kept at 20 ^$\circ$ C contains 28.0 moles of oxygen and the gauge reads 31.0 atm.After two weeks,the gauge reads 10.5 atm.How many moles of oxygen were used during the two-week period?

• A)9.25 moles
• B)7.5 moles
• C)20.5 moles
• D)18.5 moles
• E)9.48 moles

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