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A 20.4−g sample of dinitrogen monoxide is confined in a 3.44−L vessel. What is the pressure...

A 20.4−g sample of dinitrogen monoxide is confined in a 3.44−L vessel. What is the pressure (in atm) at 121 degrees celcius?

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Answer #1

Molar mass of N2O = 2*MM(N) + 1*MM(O)

= 2*14.01 + 1*16.0

= 44.02 g/mol

mass of N2O = 20.4 g

we have below equation to be used:

number of mol of N2O,

n = mass of N2O/molar mass of N2O

=(20.4 g)/(44.02 g/mol)

= 0.4634 mol

we have:

V = 3.44 L

n = 0.4634 mol

T = 121.0 oC

= (121.0+273) K

= 394 K

we have below equation to be used:

P * V = n*R*T

P * 3.44 L = 0.4634 mol* 0.08206 atm.L/mol.K * 394 K

P = 4.3554 atm

Answer: 4.36 atm

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