Mole Concept

Easychemistry

The mass percent of nitrogen in NH4 NO3 (Atomic masses: N=14, H=1, O=16) is:

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17.5%

25%

28%

35%

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Subject: chemistry
Chapter: some basic concepts in chemistry
Topic: mole concept
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

35%

Calculate Molar Mass of $N H_{4} N O_{3}$ :
- $M = 2 \times 14 (N) + 4 \times 1 (H) + 3 \times 16 (O)$
- $M = 28 + 4 + 48 = 80 g / m o l$ .
Determine Mass of Nitrogen:
- There are 2 atoms of Nitrogen in the formula unit.
- $M a ss o f N = 2 \times 14 = 28 g$ .
Calculate Mass Percent:
- $P erce n t = \frac{28}{80} \times 100 = 0.35 \times 100 = 35%$ .

This easy difficulty chemistry question is from the chapter some basic concepts in chemistry, covering the topic of mole concept. It appeared in the 2025 exam.

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