PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoAnswer the following question in a few sentences:
A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?
One gram of gold sample will contain 90 / 100 = 0.9 g of gold.
Number of moles of gold = Mass of gold / Atomic mass of gold.
= 0.9 / .
= .
One mole of gold contains \(N_A\) atoms = x \(10^2{^3}\).
∴ 0.0046 mole of gold will contain = 0.0046 × \(6.022\) × \(10^2{^3}\).
= x \(10^2{^1}\).
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