Q.
A 25.0mm×40.0mm piece of gold foil is 0.25mm thick. The density of gold is 19.32g/cm3. How many gold atoms are in the sheet? (Atomic weight : Au=197.0 )
1023
157
Some Basic Concepts of Chemistry
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Solution:
Volume of gold foil =25×40×0.25mm3 =250×10−3cm3
Mass of gold foil =19.32×250×10−3g=4.83g
No. of gold atoms =1974.83×NA=1.47×1022