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In chemisty metric weights are used rather than imperial, it makes things a lot simpler.

Mole's are easy to calculate all you need to remember is that 1mol is equal in grammes to the molecular mass of the molicule. So water is 2 Hydrogen atoms each of 1.008 Atomic Mass unit (AMU) and 1 Oxygen atom of 15.999 AMU.

So (2x1.008)+15.999=18.015 AMU therefore one mol of water is 18.015g.

Two points though.

1: As it is difficult to weigh out to one thousandth of a gramme you often round up especially when using water as volume is often used instead as 1Cm3 is appprox 1g

2:AMU's are approximate weights as different isotopes have different AMU's, therefore 1 mol of water is approx 18.015g.

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17y ago

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