The number of moles of O2 in 2.24 L of O2 gas.

calculate at STP

The number of moles of  is required.

The number of moles of is 0.2 moles.

V = Volume = 2.24 L

= Density of at STP = 1.429 g/L

M = Molar mass of = 16 g/mol

Density is given by

Molar mass is given by

The number of moles of is 0.2 moles.

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0.1 mol O2

Explanation:

1 mol of any gas at STP = 22.4 L

2.24L/22.4L = 0.1

1mol * 0.1 = 0.1 mol

you have 0.1 mol of O2

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i