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DATA:
Number of atoms= 7.5*1015
Mass in grmas=?
SOLUTION:
6.02*1023 atoms are present in 1 mol of Ni
7.5*1015 atoms are present in (1*7.5*1015)/6.02*1023
= 1.2458*10-8 mol
Mole of Ni = mass of Ni in grmas/ atomic mass of Ni
Mass of Ni= mole of Ni * atomic mass of Ni
Mass of Ni = 1.2458*10-8 * 58.6934
Mass of Ni = 7.3123*10-7g
DATA:
Mass of aspirin= 0.1g
Number of molecules = ?
SOLUTION:
Mole of aspirin = mass of aspirin/ molecular mass of aspirin
= 0.1 /180
= 5.5555*10-4
1 mol aspirin contains 6.02*1023 molecules
5.5555*10-4 contains (6.02*1023* 5.5555*10-4)
=3.3444*1020 molecules
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