Q. Among the following, choose the ones with equal number of atoms. A. 212 g of Na$_2$CO$_3$ (s) [molar mass = 106 g] B. 248 g of Na$_2$O (s) [molar mass = 62 g] C. 240 g of NaOH (s) [molar mass = 40 g] D. 12 g of H$_2$(g) [molar mass = 2 g] E. 220 g of CO$_2$(g) [molar mass = 44 g] Choose the correct answer from the options given below:
A) A, B, and C only
B) A, B, and D only
C) B, C, and D only
D) B, D, and E only
Explanation
[Solution by Claude - not from source] Moles of atoms: A $=2\times6=12$; B $=4\times3=12$; C $=6\times3=18$; D $=6\times2=12$; E $=5\times3=15$. A, B and D are equal. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.