Science
Chemistry Homework Help

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Final Answer

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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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Ahsan N. (560)
University of Virginia

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