Project of Christopher Boo

Chemistry Level 2

Determine the number of hydrogen atoms contained in $100.0\text{ g}$ of ethyl alcohol $\text{C}_{2}\text{H}_{6}\text{O}.$

9.8\times10^{22}

11.8\times10^{27}

8.6\times10^{18}

7.8 \times10^{24}

1 solution

Deepak Sharma
Jan 27, 2014

The molecular mass of ethyl alcohol = $2\times12$ + $6\times1$ + 16 =46 So the number of moles of 100g ethyl alcohol =100/46=2.174 Thus the number of molecules of ethyl alcohol = $moles \times Avagadro's number$ = $2.174\times6.02\times10^{23}$ = $1.31\times10^{24}$ Now, each molecule of ethyl alcohol contains 6 hydrogen atoms, so total number of hydrogen atoms in 100g ethyl alcohol is $1.31\times10^{24}\times6$ = $7.8\times10^{24}$

Good Job Deepak ! ::)

Gabriel Merces - 7 years, 4 months ago

Project of Christopher Boo

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