Відомо:
m1(речовини)=
=1кг=1000г;
V1(води)=10л=
=10000 мл;
m2(розчину)=
=41кг=41000г;
W2=2,44%.
Знайти:
W1 -?
m2(речовини) -?
1. Знаходимо масу води в першому розчині
за формулою:
m = V•ρ, де густина води ρ=1 г/мл.
m1(води)=V1(води)•ρ=10000 мл•1 г/мл =
=10000 г. Бачимо, що для води об'єм
відповідає масі, тому ця дія не є
обов'язковою.
2. Знаходимо масу першого розчину:
m1(розчину)=m1(речовини)+m1(води) =
= 1000 г + 10000 г = 11000 г.
3. Знаходимо масову частку речовини (вапна)
в першому розчині за формулою:
W1=(m1(речовини)/m1(розчину))•100%
W1= (1000 г/11000 г)• 100%= 0,09•100%=9%.
4. Знаходимо масу речовини (хлорки) в другому
розчині за формулою:
m2(речовини)=(W2•m2(розчину))/100%
m2(речовини)=(2,44%•41000г):100%=1000,4 г=
≈1000 г = 1 кг.
Відповідь: масова частка вапна в першому
розчині становить 0,09 або 9%; в розчині
хлорки масою 41 кг з масовою часткою її
2,44% міститься хлорка масою 1 кг.
1Hilary and Tensing climbed Everest in 1953. Everest was climed by Hilary and Tensing in 1953. 2They are going to sell the Polaris diamond. The Polaris diamond is being gone to sell by them. 3They offered her a job as a designer at Versace. She was offered a job as a designer at Versace. 4Someone must have taken the car during the night. The car must have been taken by someone during the night. 5People used to speak Welsh in this area. Welsh is used to speak in this area.
2 Put the verbs in brackets into the active or passive. 1I threw the ball and it was caugh by the dog. 2These songs were written by John Lennon. 3They built a new hotel beside the beach. 4Leonardo Da Vinci’s Mona Lisa was painted on canvas. 5The volcano last erupted in 2005.
3 Change the verbs in brackets into the passive (ordinary or perfect) infinitive or gerund. 1 Do you think the director was offended by asking to leave the meeting? 2The painting is likely sold for €600,000. 3Legoland may be visited by 250,000 tourists next year. 4Renán liked to be called Crum. 5There is nothing strange about being frightened of dogs.
1Hilary and Tensing climbed Everest in 1953. Everest was climed by Hilary and Tensing in 1953. 2They are going to sell the Polaris diamond. The Polaris diamond is being gone to sell by them. 3They offered her a job as a designer at Versace. She was offered a job as a designer at Versace. 4Someone must have taken the car during the night. The car must have been taken by someone during the night. 5People used to speak Welsh in this area. Welsh is used to speak in this area.
2 Put the verbs in brackets into the active or passive. 1I threw the ball and it was caugh by the dog. 2These songs were written by John Lennon. 3They built a new hotel beside the beach. 4Leonardo Da Vinci’s Mona Lisa was painted on canvas. 5The volcano last erupted in 2005.
3 Change the verbs in brackets into the passive (ordinary or perfect) infinitive or gerund. 1 Do you think the director was offended by asking to leave the meeting? 2The painting is likely sold for €600,000. 3Legoland may be visited by 250,000 tourists next year. 4Renán liked to be called Crum. 5There is nothing strange about being frightened of dogs.
m1(речовини)=
=1кг=1000г;
V1(води)=10л=
=10000 мл;
m2(розчину)=
=41кг=41000г;
W2=2,44%.
Знайти:
W1 -?
m2(речовини) -?
1. Знаходимо масу води в першому розчині
за формулою:
m = V•ρ, де густина води ρ=1 г/мл.
m1(води)=V1(води)•ρ=10000 мл•1 г/мл =
=10000 г. Бачимо, що для води об'єм
відповідає масі, тому ця дія не є
обов'язковою.
2. Знаходимо масу першого розчину:
m1(розчину)=m1(речовини)+m1(води) =
= 1000 г + 10000 г = 11000 г.
3. Знаходимо масову частку речовини (вапна)
в першому розчині за формулою:
W1=(m1(речовини)/m1(розчину))•100%
W1= (1000 г/11000 г)• 100%= 0,09•100%=9%.
4. Знаходимо масу речовини (хлорки) в другому
розчині за формулою:
m2(речовини)=(W2•m2(розчину))/100%
m2(речовини)=(2,44%•41000г):100%=1000,4 г=
≈1000 г = 1 кг.
Відповідь: масова частка вапна в першому
розчині становить 0,09 або 9%; в розчині
хлорки масою 41 кг з масовою часткою її
2,44% міститься хлорка масою 1 кг.