## Unclear on Law of Conservation of Mass

Andrea_1H
Posts: 50
Joined: Wed Sep 18, 2019 12:18 am

### Unclear on Law of Conservation of Mass

The Law of Conservation of Mass makes sense to me, but in lecture the example used was
$2Na(s) + 2H_{2}O(l) \rightarrow 2NaOH(aq) +H_{2}(g)$
and he put that it's basically 2 moles of sodium + 2 moles of water = 2 moles of NaOH + 1 mole of hydrogen. Does there not have to be the same number of moles on both sides?

ShravanPatel2B
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

### Re: Unclear on Law of Conservation of Mass

There is the same number of moles of Na, H, and O. This equation does abide by the law of conservation of mass because the mass is equal on both sides.

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