What is the mass in grams of one molecule of ethnic acid #CH_3COOH#?

1 Answer
Trevor Ryan.
Dec 16, 2015

#9.96181xx10^(-23)g#

Explanation:

1 mole of the organic carboxylic acid ethanoic acid (acetic acid) has a mass equal to its molar mass #M_r=12+3+12+16+16+1=60g//mol#.

But 1 mole contains an Avagadro number of molecules, ie #N_A=6.023xx10^23# molecules.

Therefore 1 molecule of this weak acid has a mass of #60/(6.023xx10^23)=9.96181xx10^(-23)g#

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