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Question

What is the formula mass of ethyl alcohol, C2H5OH?


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Solution

Step 1: Formula mass:

  • The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms in an ionic compound.”

Step 2: Atomic mass of each atom in Ethyl alcohol (C2H5OH):

Ethyl alcohol ( C2H5OH ) has two Carbon(C) atoms, six Hydrogen(H) atoms, and one Oxygen(O) atom.

AtomicmassofoneCarbonatom=12gmol-1AtomicmassoftwoCarbonatoms=2×12g/mol=24gmol-1AtomicmassofoneHydrogenatom=1gmol-1AtomicmassofsixHydrogenatoms=6g/mol=6gmol-1AtomicmassofoneOxygenatom=16gmol-1

Step 3: Formula mass of Ethyl alcohol (C2H5OH):

Formulamass=(24+6+16)gmol-1=46gmol-1

Thus, the formula mass of C2H5OH is 46gmol-1.


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