How do you calculate molecular weight?

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How do you calculate molecular weight?

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Answer 1 · 2016-07-03T10:21:48

Typically we calculate a molar mass, i.e. a mass of a given quantity of molecules. The given quantity is $N_{A}$ $N_A$ , $Avogadro's number$ $"Avogadro's number"$ $=$ $=$ $6.022 \times 10^{23} \cdot m o l^{- 1}$ $6.022xx10^23*mol^-1$ .

Explanation:

$Avogadro's number$ $"Avogadro's number"$ of $^{1} H$ $""^1H$ has a mass of $1.00 \cdot g$ $1.00*g$ precisely; $Avogadro's number$ $"Avogadro's number"$ of $^{12} C$ $""^12C$ has a mass of $12.00 \cdot g$ $12.00*g$ precisely. If I have $Avogadro's number$ $"Avogadro's number"$ , $6.022 \times 10^{23}$ $6.022xx10^23$ , individual $^{12} C^{1} H_{4}$ $""^12C^1H_4$ molecules, it follows that I have $(4 \times 1.00 + 12.00) \cdot g$ $(4xx1.00+12.00)*g$ . Typically we would say methane has a molar mass of $16.00 \cdot g \cdot m o l^{- 1}$ $16.00*g*mol^-1$

You will never be asked to remember these atomic masses, mind you will certainly pick up and learn some of them by memory, because they will be available on a Periodic Table of Elements, that will be issued in every chemistry and physics exam.

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How do you calculate molecular weight?

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