a piece of copper weighs 0.635 g. how many atoms of copper does it contain?
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Answer:
Gram atomic mass of copper=63.5 g
No. of moles in 0.635g of copper = 0.635/63.5=0.01
No. of copper atoms in 0.01 mole=
0.01×6.02× 10 power 23
=>6.02 ×10 power 21
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