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In three moles of ethane (C2H6), calculate the following:
(i) Number of moles of carbon atoms (ii) Number of moles of hydrogen atoms
(iii) Number of molecules of ethane

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(I) 6 moles of carbon (2) 18 moles of hydrogen (3) 6× Avogadro's number
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(1) 2 carbon in 1 mol of C2H6 so in 3 mol of C2H6 it has 3 x 2=6 mol of carbon (2) 6 Hydrogen in 1 mol of C2H6 so in 3 mol of C2H6 it has 3 x 6=18 mol of Hydrogen (3) 1 mol contain 6.02 x 10^23 so in 3 mol of C2H6 it has 3 x 6.02 x 10^23=18.069 x10^23 molecules
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(1)  2 carbon in 1 mol of C2H6 so in 3 mol of C2H6 it has 3 x 2=6 mol of carbon

(2) 6 Hydrogen in 1 mol of C2H6 so in 3 mol of C2H6 it has 3 x 6=18 mol of Hydrogen

(3) 1 mol contain 6.02 x 10^23 so in 3 mol of C2H6 it has 3 x 6.02 x 10^23=18.069 x10^23 molecules

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