Question

What is the number of moles of oxygen atoms present in 5 moles of water?

Answer 1

Answer:

Explanation:

ANSWER

1 mole of oxygen atoms has a mass of 16gm which is its atomic mass,

So 0.2 moles of oxygen atoms have the mass of 0.2×16=3.2gm

1 mole of water molecules has a mass of 18gm which is its molecular weight.

So 0.5 moles of water molecules has a mass of 0.5×18=9gm

Answer 2

Answer:

2.5 moles

Explanation:

To find number of moles of O2 we will first write the general reaction which is given as:

2H2 + O2------> 2H2O

Which means 1O2 requires 2 moles of water

so we get

1O2=2H2O

Or 1/2 O2=H2O

OR 5 moles H20=5/2 moles of O2

5 moles of H2O=2.5 Moles OF O2