Answer to Question #168025 in General Chemistry for Yaop

Question

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

Answer 1

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

m(NaN₃)/2*Mr(NaN₃)=V(N₂)/3*V_m;

V(N₂)=m(NaN₃)*3*V_m/2*Mr(NaN₃)

m(NaN₃)=260 g;

Mr(NaN₃)= 23+3*14=65 g/mol;

V_m=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/T_1;

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