Question

1 mole of water vapour is condensed to liquid atb25 degrees Celsius . Now this water contains
1) 3 moles of atoms
2)1 mole of hydrogen molecules 3)10 moles of electrons
4)16g of oxygen
The correct combination is a) 1 & 2
b) 1 & 3
c) 1 & 4
d) All are correct

Answer 1

1.Answer: All are correct

1 mole of water contains 2 moles of Hydrogen atoms + 1 mole of Oxygen atoms = 3 moles of atoms

1 mole of H2,16gm O (2X1+8) =10 moles of electrons

 

Answer 2

The correct answer is option (d). All of them are correct.

• 1 mole of water vapour converted to liquid means there is 1 mole of $H_2O$.
• One mole of water is made up of two hydrogen atoms and one oxygen atom. Therefore, it can be said that 1 mole of water contains 3 moles of atoms.
• There are 2 moles of hydrogen atoms in a water molecule.
• Two hydrogen atoms combine to form one mole of hydrogen molecule. That is, one mole of water is made up of one mole of hydrogen molecule.
• The number of moles of electrons in a hydrogen molecule and an oxygen atom is 2 and 8, respectively.
• Therefore, in total, there are 10 moles of electrons in a single mole of water.
• The atomic mass of an oxygen atom is 16 g.
• Thus, all of the given options are true.
• A mole is the amount of material that contains $6.022$ × $10^{23}$particles.

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