Q.5 A 25.0 mm x 40.0 mm piece of gold foil is 0.25 mm thick. The density f gold is 19.32 g/cm3. How many gold atoms are in the sheet ? (Atomic weight : Au = 1970)
1) O 4.3x102
2)7.7 x 10"
3) 1.47x10-2
4) 1.5x10
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