Question

Calculate the moles of oxygen atoms in 8g of oxygen gas​

Answer 1

Answer:

moles= wt.of sub/g.m.wt

=8/16

=0.5

Answer 2

Answer:

0.5 moles

Explanation:

We know that, the molecular mass of oxygen gas is 16 * 2 i.e. 32 g.

It's a rule that, the molecular mass of every element is equal to 1 mole of that particular element.

Now, we can say that,

32 g of Oxygen gas = 1 mole of Oxygen gas

=> 1 g of Oxygen gas = (1/32) mole of Oxygen gas

=> 8 g of Oxygen gas = [(1/32)*8] moles of Oxygen gas = [1/4] moles of Oxygen gas = 0.25 moles of Oxygen gas

Now, we know that one molecule of oxygen contains two atoms of oxygen.

So, moles of oxygen atoms in 8g of oxygen gas is,

2 * 0.25 = 0.5 moles