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mol=gr/Ar jumlah atom=mol x bil avogadro
Bil avogadro= 6.2 x 10^23
a. Mol=7.8/39 =0.2
Jumlah atom= 0.2 x 6.2 x 10^23 =1.24 x10^23
b. Mol= 3.1/31x4 =0.025 (31 kali 4 karena unsur P4)
Jumlah atom= 0.025 x 6.2 x10^23= 1.55 x 10^22
C. Ar H2so4 = (2*1)+32+(16*4) = 98
Mol= 4.9/98 = 0.05
Jumlah atom = 0.05 x 6.2 x10^23= 3.1x10^22
D. ArCaCO3 = 40+12+(3*16) = 100
Mol= 10/100= 0.1
Jumlah atom = 0.1 x 6.2 x10^23 = 6.2 x 10^22
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