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April 25, 2015

Homework Help: Chemistry

Posted by A Canadian on Thursday, February 7, 2013 at 11:16pm.

I don't really understand why unit analysis works.

I found a simple example on a website (I can post the link in a comment if you want).

It says,
For example, convert 18 grams of water to moles. The molar mass of water is 18 g/mol; therefore :

18g H2O x 1 mol/18g H2O = 1 mol H2O

In 1 mol/18g H2O, I get that the denominator is molar mass, but how come the regular unit, g/mol, isn't used and just g is used? How come we're able to do that?

And what does this equation mean in words.. ?
There's 18g H2O for every 1mol of H2O (which weighs 18g)... So there's 1 mol of H2O...?

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