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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 t...

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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?

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(a) one gram of gold will contain \(\frac{90}{100}\)

= 0.9 g of gold.

∴ Number of mole of gold = \(\frac{Mass\;of\;gold}{Atomic\;mass\;of\;gold}\)

= \(\frac{0.9}{197}\) = 0.0046

∴ 0.0046 mole of gold will contain = 0.0046 x 6.022 x \(10^{23}\)

= 2.77 x \(10^{21}\) atoms

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

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

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