Calculate the equivalent mass of each of the following acids.

a) HC2H3O2

b) KHCO3

c) H2SO3

To calculate the equivalent mass of an acid, we need to first determine the number of acidic hydrogens in the molecule.

a) HC2H3O2: In this case, we have one acidic hydrogen atom.

To find the equivalent mass, we need to calculate the molar mass of the acid and then divide it by the number of acidic hydrogens present in the molecule.

The molar mass of HC2H3O2 can be calculated as follows:
- H has a molar mass of 1g/mol.
- C has a molar mass of 12g/mol.
- O has a molar mass of 16g/mol.

Molar mass of HC2H3O2 = (1 x 2) + (12 x 2) + (1 x 3) + (16 x 2) = 60g/mol

Therefore, the equivalent mass of HC2H3O2 would be 60g/mol divided by 1 acidic hydrogen, which is equal to 60g/mol.

b) KHCO3: In this case, we have one acidic hydrogen atom.

The molar mass of KHCO3 can be calculated as follows:
- K has a molar mass of 39g/mol.
- H has a molar mass of 1g/mol.
- C has a molar mass of 12g/mol.
- O has a molar mass of 16g/mol.

Molar mass of KHCO3 = 39 + (1 x 1) + (12 x 1) + (16 x 3) = 100g/mol

Therefore, the equivalent mass of KHCO3 would be 100g/mol divided by 1 acidic hydrogen, which is equal to 100g/mol.

c) H2SO3: In this case, we have two acidic hydrogen atoms.

The molar mass of H2SO3 can be calculated as follows:
- H has a molar mass of 1g/mol.
- S has a molar mass of 32g/mol.
- O has a molar mass of 16g/mol.

Molar mass of H2SO3 = (1 x 2) + 32 + (16 x 3) = 82g/mol

Therefore, the equivalent mass of H2SO3 would be 82g/mol divided by 2 acidic hydrogen atoms, which is equal to 41g/mol.

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