What is the molecular Weight of Nitric acid (HNO3 ) ?
Correct answer: A. 63.012 g/mol
- A. 63.012 g/mol
- B. 65.012 g/mol
- C. 70.012 g/mol
- D. 81.011 g/mol
Explanation
Using standard atomic masses, the molar mass of HNO3 is 1.008 g/mol + 14.007 g/mol + 3 x 15.999 g/mol = 63.012 g/mol. The likely trap is 65.012 g/mol, which results from adding the atomic masses incorrectly.
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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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