Number of molecules in one dm3 of water will be almost:
Correct answer: B. 55.66 x 6.022 x 10^23
- A. 18 x 6.02 x 10^23
- B. 55.66 x 6.022 x 10^23
- C. 18 x 6.2 x 10^23
- D. 2 x 6.2 x 10^23
Explanation
Option B is correct as "1 dm3" of water is "1 liter" which weighs "1000g". "1000g" divided by the weight of "1 mol" of water "(18g)" is equal to "55.5" mol." 55.5 mol" multiplied by Avogadro's constant gives a total number of molecules.
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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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