Answer to Question #168025 in General Chemistry for Yaop

Question #168025

Please with the steps:

2NaN3 (s) = 2Na(s) + 3N2 (g)

What volume of nitrogen gas measured at 1 atm and 9.00 °C is formed by the decomposition of 260 g of sodium azide?

Volume=............L



1
Expert's answer
2021-03-08T07:05:52-0500

Volume of N2 at stp can be calculated using the reaction:

m(NaN3)/2*Mr(NaN3)=V(N2)/3*Vm;

V(N2)=m(NaN3)*3*Vm/2*Mr(NaN3)


m(NaN3)=260 g;

Mr(NaN3)= 23+3*14=65 g/mol;

Vm=22.4 L/mol;


V(N2)=260*3*22.4/(2*65)=134.4 L; - volume at stp


Volume of N2 at 90C(282 K) can be calculated using Charles's law:

V1/T1=V2/T2;

V2=V1T2/T1;

T1=0 oC=273 K;

V1=134.4 L

T2=282 K


V2=134.4*282/273=138.83 L

Answer: Volume=138.83 L




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