# Someone please help me with these 2 problems!! I am going nuts!

How many moles are there in 16grams of O2?

What is the volume of 16 grams of O2 at Stp?

Look up the atomic mass of oxygen on the periodic table. It is 16 grams but look it up so you will know how to do these problems. Since oxygen is O2, multiply 2 x 16 = 32 g for the mass of 1 mole. If the mass of 1 mole is 32 grams, what number of mols is in 16 grams?

For number 2. The volume of a mole of any gas at STP is 22.4 L.

Post your work here if you get stuck and we can help you find any errors.

## To solve the first problem, you need to find the number of moles in 16 grams of O2.

First, find the molar mass of O2 by multiplying the atomic mass of oxygen (16 grams) by the number of oxygen atoms present in O2, which is 2. So the molar mass of O2 is 32 grams.

Now, to find the number of moles, divide the given mass (16 grams) by the molar mass of O2 (32 grams/mol).

Number of moles = 16 grams / 32 grams/mol

Simplifying, you get:

Number of moles = 0.5 mol

Therefore, there are 0.5 moles in 16 grams of O2.

For the second problem, you need to find the volume of 16 grams of O2 at STP (Standard Temperature and Pressure).

At STP, the volume of one mole of any gas is 22.4 liters.

Since we already know that the number of moles is 0.5, the volume of 0.5 moles of O2 at STP is:

Volume = 0.5 mol x 22.4 L/mol

Simplifying, you get:

Volume = 11.2 L

Therefore, the volume of 16 grams of O2 at STP is 11.2 liters.