00:01
So today, we're asked how many grams of 10 % hydrochloric acid or hydrogen chloride would we need to dissolve 13 grams of zinc? okay, so our first step is finding the number of moles of zinc that are being dissolved.
00:15
All right, and so we know that to convert to moles, we take the mass and we divide it by the atomic weight.
00:21
All right, so to get moles of zinc, what we do is we take what we're given, 13 grams of zinc, and we use the mass in one mole of zinc which is equal to 65 .4 grams okay and this gives us 0 .198 moles of zinc.
00:43
From there to dissolve this amount of zinc we need to use the reaction between zinc and hydrochloric acid.
00:51
So if you look we take zinc and we add two moles of hydrochloric acid and this gives us zinc chloride and hydrogen gas.
01:02
And that's our balanced equation.
01:04
So for every one mole of zinc, we need two moles of hydrochloric acid.
01:10
Okay...