Calculate the mass of 6.45 x 10^22 atoms of carbon

m(C)=?

N(C)=6,45*10²²atom

N= n*Na      n(C)=N/Na    n(C)= 6,45*10²²/6,023*10²³   N(C)=0,1075mol

M(C)=12   n=m/M     m(C)=0,1075mol*12g/mol       m(C)=1,29g

Explanation:

We use two types of formulas: N=n*Na and n=m/M

N- number of atoms

Na- number of Avogadro 6,023*10²³

n- quantity of substance

m-mass of the substance

M-molar mass (for carbon is 12, we can find it in the Periodic sistem)

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