Deriving mass percent composition from empirical formula

[105561735]

Hello,

I was doing some practice problems and ran across a question that was asking me to calculate the molar mass of acetic acid (CH3CO2H ). I found the value to be 60.05 amu but the answer key gave me a different value. Could anyone help me with this question?

[Nicholas Ryan 2K]

You are correct. The molar mass of acetic acid is (4*1)+(12*2)+(16*2) = 60 amu = 60 grams/mole
The answer key you used was incorrect.