Question on: JAMB Chemistry - 2023
What is the molar mass of water (H2O)?
A
18 g/mol
B
22 g/mol
C
16 g/mol
D
12 g/mol
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Correct Option: A
To calculate the molar mass of water (H2O), we need to sum the atomic masses of its constituent atoms.
* Hydrogen (H) has an atomic mass of approximately 1 g/mol, and there are two hydrogen atoms in water. Thus, the mass contribution from hydrogen is 2 x 1 g/mol = 2 g/mol.
* Oxygen (O) has an atomic mass of approximately 16 g/mol, and there is one oxygen atom in water. Thus, the mass contribution from oxygen is 16 g/mol.
Therefore, the molar mass of water is 2 g/mol (from hydrogen) + 16 g/mol (from oxygen) = 18 g/mol.
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