Question

A 1.0 g sample of which substance contains the largest
number of molecules?
A) CH3Cl (MM = 50.5)
B) CS2 (MM = 76.15)
C) C2H2F2 (MM = 127.7)
D) Br2 (MM =159.8)
E) they would all have the same number of molecules

Answer 1

Answer:

(A)

Explanation:

CONCEPT USED :-

1. Molar mass = mass of 1 mole = 6.023 × 10^23 molecules.
2. number of moles = $\frac{given \: weight}{molar \: mass}$
3. Number of molecule is directly proportional to number of moles.

WORKING STEPS :-

1. Number of molecule is directly proportional to number of miles and number of moles is inversely proportional to molar mass.
2. Hence, in 1 g of that molecules will have largest number which has least molar mass.
3. That is why, your answer is (A).

Regards

Kshitij