A piece of brass weights 12.9 g in air. When completely immersed in wa

1.	A piece of brass weights 12.9 g in air. When completely immersed in water, it weights 11.3 g. The relative densities of Cu and Zn are 8.9 and 7.1 respectively. Calculate in the alloy.
Answer» Loss of weight = (12.9 - 11.3) g = 1.6 g weight of water displaced = 1.6 g If m is the mass of Cu, them [m/8.9 + (12.9 - m)/7.1] g = 1.6 g 7.1 m + 12.9 x 8.9 - 8.9 m = 1.6 x 8.9 x 7.1 1.8 m = 114.8 -101.1 m = 7.6 g

A piece of brass weights 12.9 g in air. When completely immersed in water, it weights 11.3 g. The relative densities of Cu and Zn are 8.9 and 7.1 respectively. Calculate in the alloy.

Answer»

Loss of weight = (12.9 - 11.3) g = 1.6 g

weight of water displaced = 1.6 g

If m is the mass of Cu, them [m/8.9 + (12.9 - m)/7.1] g = 1.6 g

7.1 m + 12.9 x 8.9 - 8.9 m = 1.6 x 8.9 x 7.1

1.8 m = 114.8 -101.1

m = 7.6 g

Discussion

No Comment Found

Related InterviewSolutions

Help me to compose 9 couples of humorous triplets(poem of 3 lines).
An iron needle sinks in water whereas a ship made of iron floats on it because(a) the edge of the needle is pointed (b) the ship is flat (c) the ship is driven by powerful engine (d) specific gravity of the needle is greater than that of water displaced by it.
What are the causes of back pain.
What are the causes of backpain.
Which of the following statements is/are correct? 1. Cholera is a disease caused by bacteria. 2. Athlete’s foot is a disease caused by virus. Select the correct answer from the codes given below: (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2
Consider the following conditions of a sick human body: 1. Swollen lymph nodes 2. Sweating at night 3. Loss of memory 4. Loss of weight Which of these are symptoms of AIDS? (a) 1 and 2 only (b) 2, 3 and 4 only (c) 1, 3 and 4 only (d) 1, 2, 3 and 4
Which one of the following sets is correctly matched? (a) Diphtheria, pneumonia and leprosy : Hereditary (b) AIDS, syphilis and gonorrhoea : Bacterial (c) Colour blindness, haemophilia and sickle cell anaemia : Sex linked (d) Polio, Japanese encephalitis and plague : Nematode
Which of the following are characteristics of diabetes mellitus, a common disease of human beings? 1. Increase of sugar in blood 2. Appearance of sugar in urine 3. Loss of hunger 4. Lack of energy Which of the statements given above are correct? (a) 1 and 2 only (b) 1, 2 and 3 only (c) 1, 2 and 4 only (d) 1, 2, 3 and 4
Assertion (A): The person with diabetes insipidus feels thirsty. Reason (R): A person with diabetes insipidus suffers from low secretion of vasopressin. Codes: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true, but R is not the correct explanation of A. (c) A is true, but R is false. (d) A is false, but R is true.
Which of the following are associated with diabetes mellitus, a common disease in adults? 1. Higher sugar level in blood 2. Lower sugar level in blood 3. Lower insulin level in blood 4. Higher insulin level in blood Select the correct answer from the codes given below: Codes: (a) 2 and 4 (b) 2 and 3 (c) 1 and 3 (d) 1 and 2

A piece of brass weights 12.9 g in air. When completely immersed in water, it weights 11.3 g. The relative densities of Cu and Zn are 8.9 and 7.1 respectively. Calculate in the alloy.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment