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Mole Concept

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Question

What is the molecular weight of $H_{2} O$ ?

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Solution

Molecular weight:
The sum of the atomic weight values of the atoms in a molecule is measured as molecular weight.
Molecular weight is used to calculate stoichiometry in chemical reactions and equations.
The molecular weight of $H_{2} O$ :
The atomic mass of hydrogen is $1 u$ .
The atomic mass of oxygen is $16 u$ .
$H_{2} O$ has two hydrogens and one oxygen.
Therefore,
Molecular weight of $H_{2} O = (1 \times 2) + (16 \times 1) u$
$= (2 + 16) u = 18 u$

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