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Chemistry Regents June 2005 - Question 77 PDF Print E-mail
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Written by The Chemistry Wizard   
chemjune05q77

Correct Answer: 0.5 moles

Answering the Question:

The Cylinder contains 22g of CO2. One molecule of CO2 has a molecular mass of 12(mass of carbon) + 2x16 (mass of oxygen) = 44.

What that tells us is that 1 mole of CO2 has a weight of 44g, as 1 mole of any substance is equal to the gram molecular weight of that substance. This means 1g of CO2 has 1/44 moles.

Therefore 22g of CO2 has 1/44 x 22 moles = 0.5 moles
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