Subjective Type

If $$3$$ moles of ethane $$\displaystyle \left( { C }_{ 2 }{ H }_{ 6 } \right) $$ are given, calculate the following: (i) Number of moles of carbon atoms. (ii) Number of moles of hydrogen atoms. (iii) Number of molecules of ethane.

Solution

$$1$$ mole of ethane $$(C_2H_6)$$ has $$2$$ moles of carbon and $$6$$ moles of hydrogen.

We are given $$3$$ moles of ethane.
(i) Number of moles of carbon atoms $$\displaystyle = 3 \times 2 = 6\ mol $$

(ii) Number of moles of hydrogen atoms $$\displaystyle = 3 \times 6 = 18\ mol $$

(iii) Number of molecules of ethane $$=\displaystyle 3 \times 6.023 \times 10^{23} = 1.8069 \times 10^{24}$$

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