Calculate the number of moles for 72 grams of C (find moles from mass)
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Answer:
a) 12 g of carbon
Given mass : 12 g
No. of moles =
mole. mass
Given mass
=
12
12
=1 mole
No. of molecules = No. of moles × Avagadro No.
=1×6.22×10
23
=6.022×10
23
molecules
b) 64 g of oxygen
Given mass: 64 g
No. of moles =
mole. mass
Given mass
=
16
64
=4 mole
No. of molecules = No. of moles ×N
A
=4×6.22×10
23
=24.088×10
23
molecules
c) 72 g of water
Given mass =72 g
Molecular mass =18 g
No. of moles =
18
72
=4 mole
No. of molecules =4×6.22×10
23
=24.088×10
23
molecules
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