Question

10g of each o2 n2 and cl2 are kept in three bottles( molar mass of n2=28g/Mol o2=32g/Mol cl2=71g/mol) the correct arrangement of bottles containing decreasing no of molecules

• A. N2, O2, Cl2
• B. Cl2, O2, N2
• C. O2, N2, Cl2
• D. Cl2, N2, O2

Answer 1

Answer: (A)

N2, O2, Cl2

Answer 2

The number of molecules in a given mass of a substance is inversely proportional to its molar mass. Calculate the number of moles for each gas using the formula:

moles = mass / molar mass

Since mass is constant for all gases, the number of moles is inversely proportional to the molar mass. The number of molecules is directly proportional to the number of moles. Therefore, the order of decreasing number of molecules is the order of increasing molar mass.

Comparing the given molar masses: M(N2) = 28 g/mol, M(O2) = 32 g/mol, M(Cl2) = 71 g/mol. The increasing order of molar mass is N2 < O2 < Cl2. The decreasing order of the number of molecules is therefore N2 > O2 > Cl2.