1 a.m.u =__________________?
Correct answer: A. 1.6 x 10^-27 kg
- A. 1.6 x 10^-27 kg
- B. 1.6 x 10^-24 kg
- C. 1.6 x 10^-26 kg
- D. 1.6 x 10^-28 kg
Explanation
One atomic mass unit is defined as approximately 1.66 x 10^-27 kg, which is rounded in the options to 1.6 x 10^-27 kg. Therefore option a has the correct order of magnitude and unit. The common mistake is choosing b, which has the correct numerical digits but an exponent that is 1,000 times too large.
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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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