15.0 g NaNO3 15.0 g NaNH2 NaN3 mass

15.0 g NaNO3 15.0 g NaNH2 NaN3 mass

 

 

Sodium azide, the explosive chemical used in automobile airbags,

is made by the following reaction:

NaNO3 + 3NaNH2 → NaN3 + 3NaOH + NH3

 

If you combine 15.0 g NaNO3 with 15.0 g NaNH2,

what mass of NaN3 is produced?

 

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NaNO3의 몰질량 = 84.99 g/mol

15.0 g / (84.99 g/mol) = 0.1765 mol NaNO3

( 참고 https://ywpop.tistory.com/7738 )

 

 

NaNH2의 몰질량 = 39.01 g/mol

15.0 / 39.01 = 0.3845 mol NaNH2

 

 

 

NaNO3 : NaNH2 = 1 : 3 = 0.1765 mol : ? mol

? = 3 × 0.1765 = 0.5295 mol NaNH2

---> NaNH2는 이만큼 없다, 부족하다?

---> NaNH2 = 한계 반응물, NaNO3 = 과잉 반응물.

( 참고: 한계 반응물 https://ywpop.tistory.com/3318 )

 

 

 

NaNH2 : NaN3 = 3 : 1 = 0.3845 mol : ? mol

? = 0.3845 / 3 = 0.1282 mol NaN3

 

 

 

NaN3의 몰질량 = 65.01 g/mol

0.1282 mol × (65.01 g/mol) = 8.33 g NaN3

 

 

 

답: 8.33 g

 

 

 

 

[키워드] 3NaNH2 + NaNO3 → NaN3 + 3NaOH + NH3