Question

The largest number of molecules is present in 1 g of:-
(1) CO2
(2) H2O
(3) C2H5OH
(4) N2O5​

Answer 1

Answer:

2) H2O is your ans

Explanation:

hope its help you

Answer 2

The largest number of molecules is present in 1 g of H2O. (Option-2)

• 1 mole of any compound contains Avogadro's number of molecules, that is, 6.022 x 10^23 molecules. And, the molar mass of any element is equal to the total atomic masses of each constituent atom.
• So, 1 gram of any compound contains (6.022 x 10^23 / molar mass of the compound) number of molecules. This implies, the lesser the molar mass of a compound, the more the number of constituent molecules present in 1 gram of that compound.
• The molar mass of CO2 = 12 + 2(16) = 44 grams.
• The molar mass of H2O = 2(1) + 16 = 18 grams.
• The molar mass of C2H5OH = 2(12) + 6(1) + 16 = 46 grams.
• The molar mass of N2O5 = 2(14) + 5(16) = 108 grams.
• On comparing all the four given compounds, we get, the molar mass of H2O is the lowest among all.
• That's why H2O is the correct answer to this question.