00:04
In this problem we're asked what volume of h2o gas at 27 degrees celsius and 700 torr can be made by reacting from zinc metal.
00:34
I'm going to write the chemical reaction here.
00:47
And we will have 5 .00 grams of zinc and 100 milliliters of 0 .35 molar, 3 .50 molar.
01:12
Let me get all the sig figs in there.
01:19
Hcl.
01:25
Okay, let's begin.
01:28
That's everything that we were given so far.
01:32
So what i'm going to do is i'm going to convert each of these to moles of hcl.
01:38
And in order to do that i'm going to go find another...
01:42
Ooh, i restarted my computer today, which means everything is closed.
01:48
Let me get to p -table and make this a little bit bigger.
01:55
65 .38 is my molar mass of zinc.
02:03
And i have a 1 to 1 mole ratio of hydrogen to zinc.
02:17
And this will equal...there's my calculator.
02:23
First problem of the day.
02:24
Divided by 65 .38, 0 .076476.
02:35
76476 moles of h2.
02:40
That's one possibility.
02:44
Next, i have a 2 to 1 mole ratio of hydrochloric acid to hydrogen.
03:02
So it will be 0 .1 times 0 .35 divided by 2 is 0 .0175 moles of hydrogen.
03:15
Let me make sure i've done this right...