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화학/용액의 농도

1.704 kg HNO3/kg H2O 1.382

by 영원파란 2022. 4. 27.

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1.704 kg HNO3/kg H2O 1.382

 

 

A water solution contains 1.704 kg of HNO3 per kg of water,

and has a specific gravity of 1.382 at 20℃.

The composition of the solution expressed as:

a) Weight percent HNO3

b) lb HNO3/ft^3 solution (pounds HNO3 per ft^3 of solution)

c) Molarity (moles of HNO3 per liter of solution)

 

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a)

질량 백분율(%) = (용질 질량 / 용액 질량) × 100

( 참고 https://ywpop.tistory.com/2656 )

 

= [1.704 / (1.704 + 1)] × 100

= 63.02%

 

 

 

 

b)

1 lb = 0.45359237 kg 이므로,

(1.704 kg) (1 lb / 0.45359237 kg) = 3.756677 lb HNO3

 

 

 

용액의 질량 = 1.704 + 1 = 2.704 kg 이므로,

2704 g / (1.382 g/mL) = 1956.58466 mL

= 1.95658466 L 용액

 

 

 

1 m^3 = 1000 L 이고,

1 ft^3 = 0.3048^3 m^3 이므로,

(1.95658466 L) (1 m^3 / 1000 L) (1 ft^3 / 0.3048^3 m^3)

= (1.95658466) (1 / 1000) (1 / 0.3048^3)

= 0.069096 ft^3 용액

 

 

 

3.756677 lb HNO3 / 0.069096 ft^3 용액

= 3.756677 / 0.069096

= 54.37 lb HNO3 / ft^3 용액

= 54.37 lb HNO3/ft^3 용액

 

 

 

 

c)

HNO3의 몰질량 = 63.01 g/mol 이므로,

1704 g / (63.01 g/mol) = 27.0433 mol HNO3

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

용액의 질량 = 1.704 + 1 = 2.704 kg 이므로,

2704 g / (1.382 g/mL) = 1956.58466 mL

= 1.95658466 L 용액

 

 

 

몰농도 = 용질 mol수 / 용액 L수

( 참고 https://ywpop.tistory.com/3222 )

 

= 27.0433 mol / 1.95658466 L

= 13.82 mol/L

= 13.82 M

 

 

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Given a water solution that contains 1.704 kg HNO3/kg H2O

and has a specific gravity of 1.382 20/4,

express the composition in the following ways:

a) Weight percent HNO3

b) Mass concentration (kg HNO3 per liter of solution)

c) Molarity (moles of HNO3 per liter of solution)

 

 

 

 

[ 관련 예제 https://ywpop.tistory.com/11197 ]

수용액의 질량비가 1.704 kg HNO3/kg H2O이고 20℃ 비중은 1.382이다.

20℃에서 HNO3의 농도(kg/m3)를 구하시오.

 

A solution in water contains 1.704 kg of HNO3/kg H2O,

and the solution has a specific gravity of 1.382 at 20℃.

What is the mass of HNO3 in kg per cubic meter of solution at 20℃?

 

 

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