00:01
Here in this problem given, suppose a student repeats experiment one using an unknown metal instead of magnesium.
00:08
The unknown metal reacts similarly to magnesium.
00:12
The student adds 5 .92 grams of unknown metal to a crucible that has a mass of 35 grams.
00:19
The crucible and its contents are heated over a moons and burner for several minutes.
00:24
The mass of the crucible and its contents after heating is 42 .53 grams.
00:31
We have to identify the unknown metal based on the results of the experiment.
00:35
And we have to assume all of the unknown metal reacts.
00:40
Now here we have the mass of the unknown metal, we have the mass of the crucible, and we have the mass of the final product.
00:48
So first we'll find out the mass of the product.
00:54
So mass of the product.
01:05
That will be the final mass 42 .53 grams minus the mass of the crucible which is 35 grams and we get 7 .53 grams.
01:19
Now this product contains the unknown metal and oxygen.
01:25
So we can find out the mass of oxygen.
01:30
Mass of oxygen that will be the mass of the product.
01:36
7 .53 grams minus the mass of the unknown metal, which is 5 .92 grams.
01:44
And we get 1 .61 grams...