The number of nitrogen atoms present in 160 amu of ammonium nitrate are:
Correct answer: A. 4
- A. 4
- B. 5
- C. 6
- D. 8
Explanation
1 molecule of NH4NO3 = 80 amuAs 2 times 80 is 160, therefore by balanced chemical equation, 160 amu of NH4 are present in two molecules.80 amu : 1 molecule80 × 2 amu : 2 molecules160 amu : 2 molecules
This question appeared on the HEC Phase II 2017 paper, which you can sit online with every answer explained.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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