The mass of one mole of a substance in grams is called molar mass. It is equal to the sum of the mass of moles of each element present in the substance. The S.I unit of molar mass is.
The steps to calculate the molar mass of a substance are as follows:
1. Write the chemical formula of the substance.
2. Determine the moles of atoms of each element present in one mole of the substance.
3. Take the sum of the mass of moles of each element present in the substance.
The chemical formula of acetic acid is,
The elements present in acetic acid are:
1. Carbon (C)
2. Hydrogen (H)
3. Oxygen (O)
In one mole of acetic acid, two moles of carbon atoms, four moles of hydrogen atoms and two moles of oxygen atoms are present.
The mass of one mole of carbon atoms is,
The mass of one mole of hydrogen atoms is,
The mass of one mole of oxygen atoms is,
The formula to calculate the molar mass of acetic acid is,
Substitute for , for and for in equation (1).
Therefore, the molar mass of acetic acid is .
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