Verified Answer :

DoctorCass

Use the mole ratio:  2 moles of NaN3 :  3 moles of N2
             you have :   0.21 moles of NaN3  : x moles N2
             Cross multiply: you get 0.3 moles for N2
To find the mass= # of moles molecular mass
                             0.3 28 
                       = 8.4g


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