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Sagot :
1) Convert grams to moles
the molar mass of C2F4 is 100.0150 g/mol
[tex]molC_2F_4=5.36gC_2F_4\cdot\frac{1molC_2F_4}{100.0150gC_2F_4}=0.05359molC_2F_4[/tex]2) Convert moles of C2F4 to moles of F
F to C2F4 ratio
4 atoms of F: 1 molecule of C2F4
[tex]molF_{}=0.05359molC_2F_4\cdot\frac{4molF_{}}{1molC_2F_4}=0.21436molF[/tex]3) Convert moles of F to atom units of F
Avogadro's number is 6.022*10^23
[tex]atomsF_{}=0.21436molF\cdot\frac{6.022\cdot10^{23}atoms\text{ F}}{1molF_{}}_{}=1.291\cdot10^{23}\text{atoms F}[/tex]There are 1.291*10^23 atoms of Fluorine in 5.36 g of C2F4.
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