00:01
So to do this tachyometry, you first need the balanced equation.
00:03
So we have aluminum is reacting with hcl, and we know that it displaces the hydrogen to form h2, and we're going to form aluminum chloride, which is a, lcl3.
00:16
All right, so we have a two and a three, so this is going to be the least common multiple, which is six, and then we'll need a three here, and a two here, and then everything but aluminum is balanced, and we'll put a two, and now we're all set.
00:27
All right, so we have 2 .7 grams of aluminum, and we know that one mole of aluminum is 26 .98 grams.
00:38
Let's put the aluminum on top here.
00:46
And we're looking ultimately for the amount of h2.
00:49
So we need the moles, and then we'll plug that into the ideal gas law.
00:52
Let's use the mole ratio.
00:54
Three moles of h2 are formed for every two moles of aluminum.
00:59
Like so.
01:02
And this will give us the moles...