# Question #a95a2

##### 1 Answer

** !!LONG ANSWER !! **

Let's start with the number of nickel atoms, since it's the easiest one to calculate.

Before determining how many atoms of nickel you have in **1 gram**, you must first determine how many moles of nickel you have. This is done by using its molar mass, **58.7 g/mol**.

Use **Avodagro's number** - *1 mole* - to determine how many atoms of nickel you have

Now for the **lithium aluminium hydride** (**LAH**), or

The number of atoms of **Li**, **Al**, and **H** will be

Now for the oxygen. Gases are a little trickier because you need values for temperature and pressure to determine the number of moles. Since no mention of particular conditions was made, I'll assume **STP** - **273.15 K** and **1 atm**.

The great part about STP is that *1 mole of any ideal gas occupies exactly* **22.4 L** - this is called the molar volume of a gas. So if you know the volume, you can determine how many moles of oxygen you have.

Remember that air is only **20.9%** oxygen, so the volume of oxygen gas will be

Another thing to look out for - notice that you've got diatomic oxygen, or *oxygen atoms* will be twice the number of

Therefore, the number of oxygen atoms will be

You can use the same strategy to calculate how many atoms of nitrogen you have. Keep in mind that it too is a diatomic molecule, **78.1%**.