Question

verify by calculating that 5 moles of co4 has higher mass than 5 moles of h2o

Answer 1

molar mass of CO4 :-
$12 + 16 \times 4$
mass of C = 12 u
mass of O = 16 u
(PS : I multiplied the mass of Oxygen by 4 as the atomicity of oxygen in CO4 is 4)

now
molar mass of CO4 is
$12 + 16 \times 4 \\ = 12 + 64 \\ = 76$
molar mass (or mass of one mole) of CO4 = 76 grams

Now
molar mass of H2O
$1 \times 2 + 16$
mass of Hydrogen = 1 u
mass of Oxygen = 16 u
(PS : I multiplied the mass of Hydrogen by 2 as the atomicity of Hydrogen in H2O is 2)

now molar mass of H2O is
$1 \times 2 + 16 \\ = 2 + 16 \\ = 18$

molar mass (or mass of one mole) of H2O = 18 grams

Now mass of 5 moles of CO4 = 380 grams
$76 \times 5 \\ = 380$

And,
the mass of 5 moles of H2O = 90 grams
$18 \times 5 \\ = 90$

So,
$380 > 90$
Hence the mass of 5 moles of CO4 is greater than mass of 5 moles of H2O