Question
The number of hydrogen atoms present in 5.4 g of urea is : (Given : Molar mass of urea : 60 g mol^ -1 , N_A : 6.022 10^ 23 particles mol^ -1 )
NEET
Chemistry
Some Basic Concepts of Chemistry
2026
NEET 2026 (Cancelled)
NEET Chemistry Question (2026) — Solution
Options
- A. 1.084 10^ 23
- B. 1.084 10^ 22
- C. 2.168 10^ 22
- D. 2.168 10^ 23
Answer
D. 2.168 10^ 23
Step-by-step solution
The chemical formula of urea is NH_2CONH_2. Number of moles of urea = 5.4 60 = 0.09 mol. One molecule of urea contains 4 hydrogen atoms. Number of moles of hydrogen atoms = 4 0.09 = 0.36 mol. Total number of hydrogen atoms = 0.36 N_A = 0.36 6.022 10^ 23 = 2.16792 10^ 23 2.168 10^ 23 . Answer: 2.168 10^ 23
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