An excess of aqueous AgNO3 reacts with 41 mL of 5 M K2CrO4

An excess of aqueous AgNO3 reacts with 41 mL of 5 M K2CrO4

 

 

An excess of aqueous AgNO3 reacts with 41 mL of 5 M K2CrO4(aq)

to form a precipitate. What mass of the percipitate is formed?

 

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(5 mol/L) (41/1000 L) = 0.205 mol K2CrO4

 

 

 

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

( 참고 https://ywpop.tistory.com/10398 )

 

 

 

K2CrO4 : Ag2CrO4 = 1 : 1 계수비(= 몰수비) 이므로,

침전되는 Ag2CrO4의 몰수 = 0.205 mol

 

 

 

Ag2CrO4의 몰질량 = 331.73 g/mol 이므로,

0.205 mol × (331.73 g/mol) = 68 g Ag2CrO4

 

 

 

답: 68 g

 

 

 

 

[키워드] excess AgNO3 41 mL 5 M K2CrO4