Answer to Question 4

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(a) Use pV = nRT

 

 

1.5 106 Pa 0.8 10-3 m3 = n 8.31 J mol-1 K-1 320 K

 

 

n = 1.5 106 Pa 0.8 10-3 m3  = 0.451 mol

     8.31 J mol-1 K-1 320 K   

                           

 

(b)      The mass of the gas if its molar mass is 32.0 10-3 kg

 

                mass of gas = 0.451 mol 32.0 10-3 kg mol-1 = 0.0144 kg

                         

(c)      The mass of a single molecule of gas.

 

Mass of 1 molecule = 32.0 10-3 kg mol-1 = 5.32 10-26 kg

                                   6.023 1023 mol-1