Match the following, and select the correct code :- List - I List - II (P) Same number of atoms (1) 4.25 g NH 3 and 4.5 g H 2 O (Q) Same number of molecules (2) 2.20 g CO 2 and 0.90 g H 2 O (R

Question

Match the following, and select the correct code :-

List - I	List - II
(P) Same number of atoms	(1) $4.25 g NH_{3}$ and $4.5 g H_{2} O$
(Q) Same number of molecules	(2) $2.20 g CO_{2}$ and $0.90 g H_{2} O$
(R) Same numbers of atoms as well as molecules	(3) $4.0 g CH_{3} Cl$ and $5.0 g NH_{3}$
(S) Different numbers of atoms as well as molecules	(4) $3.2 g O_{3}$ and 2.80 g CO
	(5) None of the above

TestHub · Accepted Answer

Question Explanation: Match the column

Concept: This question is based on calculation of mole.

Solution:

Moles (number) Moles (number)

(molecule) (atoms)

(1) NH₃: $4.25/17 = 0.25$ ( $0.25 N_{A}$ ) $0.25 \times 4 = 1 N_{A}$ atoms

H₂O: $4.5/18 = 0.25$ ( $0.25 N_{A}$ ) $0.25 \times 3 = 0.75 N_{A}$ atoms

(2) For CO₂: $2.2/44 = 0.05$ ( $0.05 N_{A}$ ) $0.05 \times 3 = 0.15 N_{A}$ atoms

H₂O: $0.9/18 = 0.05$ ( $0.05 N_{A}$ $0.05 \times 3 = 0.15 N_{A}$ atoms

(3) CH₃Cl: $4/50.5 = 0.079$ ( $0.079 N_{A}$ ) $0.079 \times 5 = 0.395 N_{A}$ atoms

NH₃: $5/17 = 0.294$ ( $0.294 N_{A}$ ) $0.294 \times 4 = 1.176 N_{A}$ atoms

O₃: $3.2/48 = 0.067$ ( $0.067 N_{A}$ ) $0.067 \times 3 = 0.201 N_{A}$ atoms

(4) CO: $2.8/28 = 0.1$ ( $0.1 N_{A}$ ) $0.1 \times 2 = 0.2 N_{A}$ atoms

Chemistry - Mole Concept Question with Solution | TestHub