?? https! \\ ? Survey of Chemistry CHEM1151-021 Summer 2018 Online Chapter 8 Cor

Question

?? https! ? Survey of Chemistry CHEM1151-021 Summer 2018 Online Chapter 8 Core Chemistry Skill: Using the Gas Law Relating Volume and Moles Part A A cyinder with a piaton pressing down with a constant pressure, is illed with 1,90 moles of a gas (), and its volume is 450 (M) IO 800 mole of gas leak out, and the pressure and temperature reman the same, what is the inal volume of the gas inside the cylinder? where Vi is the volume Siled by ny moles and V is the volume iled by a dfferent number of moles, ng Figure of 1 Part B as in the example in Part A has an initial volome of 46 0 L and you have determined that it contains 1 70 moles df emain the same, but the volume has changed to 11.5 L. How many moles of gas (ng) reman in Smaller volume Larger volume

Explanation / Answer

Ans 1

Part a

From the Avagodro number

V1/n1 = V2/n2

Initial moles n1 = 1.90 mol

Initial volume V1 = 46 L

After compression

Final moles = initial Moles - Moles leaked

n2 = 1.90 - 0.800

= 1.100 mol

Final volume V2 = V1 x n2/n1

= 46 x 1.10/1.90

= 26.63 L

Part b

V1 = 46 L

n1 = 1.70 mol

V2 = 11.5 L

Number of moles remain in cylinder

n2 = V2*n1/V1

= 11.5*1.70/46

= 0.425 moles

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