Please help!

Calculate the percent by mass of water in FeCl2 · 4H20.

36.23 %

Explanation:

Let's assume we have 1 mol of FeCl₂ · 4H₂O. In that case we would have:

1 mol of FeCl₂, weighing 126.75 g (that's the molar mass of FeCl₂), and4 moles of H₂O, weighing (4 * 18 g/mol) 72 g.

Now we can calculate the percent by mass of water:

% mass = mass of water / total mass * 100% % mass = * 100% = 36.23 %

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The answer is celsius