An Oxygen Tank Kept at 20C Contains 28

question 9

Multiple Choice

An oxygen tank kept at 20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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Definitions:

Principal

An amount of money that is loaned or invested, excluding any interest or profit earned on it.

Collateral

An asset that a borrower offers to a lender as security for a loan, which can be seized if the loan is not repaid according to the agreement.

Accounts Payable

The amount a company owes to suppliers for goods and services purchased with credit.