A customer buys a gold jewellery, he is told that the jewellery has 90% gold and the rest copper. He is given a bill which amounts 100% charges of gold. The customer refuses to pay the bill for 100% gold but brings it to 90% gold amount and settles the bill.
(a) How many atoms of gold are present in 1 gram of gold?
(b) What is the ratio of gold and copper in the jewellery?
(c) What value of customer is reflected in the above statement?

(a) 1 gram of gold will contain 90/100 = 0.9g of gold.

Number of moles of gold = mass of gold/ atomic mass of gold 
= 0.9/197
=0.0046

therefore, 0.0046 mole of gold will contain = 0.0046 x 6.022 x 1023
= 2.77 x 10 21 atoms

(b) Ratio of gold: copper = 90 : 10

(c) Values of customer are responsible and self-awareness.

Updated on: 14-Mar-2023

44 Views

Related Articles

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements