Question

Molecular weight and atomic weight based problems

Answer 1

The molecular weight of a substance is the weight in atomic mass units of all the atoms in a given formula.
An atomic mass unit is defined as 1/12 the weight of the carbon-12 isotope. The old symbol was amu, while the most correct symbol is u (a lower case letter u). The ChemTeam will use amu.
By the way, carbon-12 is defined as weighing exactly 12 amu. This is the starting point for how much an atom weighs. For example, if you weigh 1/2 as much as C-12, you weigh 6. If you weigh twice as much, you weigh 24.
The molecular weight of a substance is needed to tell us how many grams are in one mole of that substance.

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