NEET2026Chemistry-Physical Chemistry
NEET 2026 Chemistry Mole Concept MCQ Question
Type: MCQ-numerical-Medium-Class 11
The number of hydrogen atoms present in 5.4 g of urea is: (Given: Molar mass of urea : 60 g mol⁻¹ Nₐ : 6.022 × 10²³ particles mol⁻¹)
A
1.084 × 10²³
B
1.084 × 10²²
C
2.168 × 10²²
D
2.168 × 10²³
Correct Answer
Option D
Detailed Explanation
The moles of urea in 5.4 g is 0.09 (5.4/60). Each urea molecule contains 4 hydrogen atoms. Therefore, the number of hydrogen atoms is 0.09 × 4 × 6.022 × 10²³ = 2.168 × 10²³.
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