The Question is from neet-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

Which of the following has the maximum number of atoms?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Mole Concept and Avogadro's Number
	**Related Topics**: Atomic Mass, Molecular Mass, Molar Mass
	**Prerequisites**: Understanding of moles, atomic mass, and molecular mass.
## SOLUTION PATHWAY
**Given Information**:
	1 g of each substance: $H_2O$, $O_2$, $CH_4$, and $Li$.
**Method & Steps**:
	1. **Calculate the number of moles for each substance:**
		Reasoning: Number of moles = Mass / Molar Mass
	2. **Calculate the number of atoms in each substance:**
		Working: Number of atoms = Number of moles * Avogadro's number * Number of atoms per molecule
		Key Point: Avogadro's number ($N_A$) = $6.022 	imes 10^{23}$ atoms/mol
	3. **Compare the number of atoms and determine the maximum.**
		Result: $CH_4$ has the highest number of atoms.
		Verification: Comparing calculated values.
## OPTION ANALYSIS
[A] :x: 1 g of $H_2O$: Molar mass = 18 g/mol. Number of moles = $\frac{1}{18}$. Number of atoms = $\frac{1}{18} 	imes N_A 	imes 3 \approx 1.00 	imes 10^{23}$ atoms.
[B] :x: 1 g of $O_2$: Molar mass = 32 g/mol. Number of moles = $\frac{1}{32}$. Number of atoms = $\frac{1}{32} 	imes N_A 	imes 2 \approx 0.38 	imes 10^{23}$ atoms.
[C] ✓: 1 g of $CH_4$: Molar mass = 16 g/mol. Number of moles = $\frac{1}{16}$. Number of atoms = $\frac{1}{16} 	imes N_A 	imes 5 \approx 1.88 	imes 10^{23}$ atoms.
[D] :x: 1 g of $Li$: Molar mass = 7 g/mol. Number of moles = $\frac{1}{7}$. Number of atoms = $\frac{1}{7} 	imes N_A 	imes 1 \approx 0.86 	imes 10^{23}$ atoms.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing mass with the number of moles: Remember to convert mass to moles using the molar mass.
		2. Forgetting to multiply by the number of atoms per molecule: Consider the number of atoms in each molecule ($H_2O$ has 3, $O_2$ has 2, $CH_4$ has 5, and $Li$ has 1).
	**Quick Tips**:
		1. The substance with the lowest molar mass and the highest number of atoms per molecule will generally have the maximum number of atoms for a given mass.
		2. Always use Avogadro's number for converting moles to the number of atoms or molecules.

Mr. S M HUSSAIN · Answer

1 g of H₂O

Mr. S M HUSSAIN · Answer

1 g of O₂

Mr. S M HUSSAIN · Answer

The correct Option is "1 g of CH₄"

Mr. S M HUSSAIN · Answer

1 g of Li

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