Question

show that 100g of water and 100g of carbondioxide are not equal in number of moles. (atomic mass of H=1, C=12 ,O=16)

Answer 1

Let's try to understand in this way:

                  For H²O                                                            For CO²
That means clearly, 18 g of H²O=1 mole  |   44 g of CO²= 1 mole
1 g of H²O = (1/18) mole                            |   1 g of CO²= (1/44) mole
100 g H²O= (100/18)mole                          |   100 g of CO²= (100/44) moles
Approx. 5.6 moles of H²O.                       |   Approx. 2.27 moles of CO².

Here, we can see H²O have greater no. of moles.