I start with 2.04 grams of nitrogen. I want to convert that to moles of

nitrogen, so I use this ratio, that there is one mole of nitrogen in 14.007 grams.

Instead of doing the intermediate calculation,

I can then just multiply the moles of nitrogen, cancel my grams,

with the ratio that one mole of calcium nitrate has two moles of nitrogen atoms.

Now I can cancel out the moles of nitrogen.

And ultimately, I would like to have grams of calcium nitrate, so

I can multiply that quantity by the molar mass of calcium nitrate.

This is all of the calculations I did on the previous

slide, wrapped up into one. And it should give me the same result.

The final unit is going to be grams of calcium

nitrate and the answer is still 11.9 grams of calcium nitrate.

So, it worked out just as I expected. Now it's your turn to try one.

Again, make sure that you have your calculator and your

periodic table handy, so that you can answer this in-video question.