Question

The owner of a necklace claims that it is made of pure gold (d=19.2 g/cm). The necklace has a mass of 19.21 g. When the necklace is placed in a graduated cylinder that initially contained 20.8 mL of water, the level rose to 22.0mL. (a)Find the density of the necklace. (b)is this necklace made of pure gold? Explain your answer.

Answer 1

Answer:

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Answer 2

Given:

The density of gold = 19.2 gm/cm

The mass of necklace = 19.21 gm

The initial volume of water = 20.8 ml

The final volume of water = 22 ml

To Find:

(a) The density of necklace.

(b) If the necklace is made of pure gold.

Calculation:

(a) The volume of the necklace = 22 - 20.8 = 1.2 ml

- The density of necklace = Mass of necklace/Volume of necklace

⇒ The density of necklace = 19.21 / 1.2

⇒ The density of necklace = 16 gm/ml

(b) The necklace is not made up of pure gold.

- This is because the density of the necklace is different than that of pure gold.

- So, it means that the necklace contains some other substance also in addition to gold.