00:01
So with this problem, there's a really key thing here, which is that the metal chloride formula is m -c -l -3.
00:08
And we are actually reducing that to just solid m.
00:14
So that means that we must be using, there must be three moles of electrons for every one mole of m, because we're going from m -3 -plus to m -0.
00:26
And so what we can do now is just go right into this problem because we're given a time.
00:32
And we're given a current.
00:34
From there, we can get the charge.
00:35
We can use faraday's constant to determine the moles of electrons that produce that charge.
00:41
Now we have moles of electrons.
00:43
We can use our mole ratio, which is given up here, the three moles of electrons per one mole of metal.
00:49
That will give us the moles of mcl3.
00:52
From there, if we know the moles of mcl3, and we say there's a one -to -one ratio of m to mcl3, that means that the moles of mcl3 is going to equal the moles of m.
01:07
And now we can use the mass of m that's given in the problem to calculate the molar mass.
01:13
Having the molar mass, we now know the identity of the metal from the periodic table.
01:19
So we get right into this.
01:25
It's 1397 seconds...