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secure https//sessionmasteringchemistry.com/myct/itemview?assignmentproblemID 77352996 Chem 210 Section 1 Spring 2017 Maslenna ChemistDE Homework Chapter 9 Problem 9.126 Problem 9.126 Part A Nitrogen dioxide dimerizes to give dinitrogen tetroxide: 2NO2(g)-+N20.(g). At 298 K 12.55 g of an NOh/N204 mixture exerts a pressure of 0.963 atm i gases in the mixture? Express your answers using three significant figures separated by a comma. Submit My Answers Give up Incorrect. One attempt remaining; Try Again

Explanation / Answer

Given

P = 0.933 atm

V = 6.92 L

T = 298 K

R = 0.08206 L.atm/mol.K

n = PV / RT = 0.933 atm * 6.92 L / 0.08206 L.atm/mol.K * 298 K = 0.264 moles

Given

Total mass = 12.55 g

Average molar mass = mass / No. of moles = 12.55 g / 0.264 moles = 47.534 g/mol

Let mole fraction of NO2 be x1 and N2O4 be x2

Molar mass of NO2 = 46 g/mol

Molar mass of N2O4 = 92 g/mol

so average mole fraction

x1 * 46 g/mol + x2 * 92 g/mol = 47.534 g/mol

x1 + x2 = 1

solving the simultaneous equation

x1 = 0.967

x2 = 0.033

XNO2 = 0.967

XN2O4 = 0.033

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