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Molar mass of water is:

Correct answer: A. 0.018 kg/mol

  • A. 0.018 kg/mol
  • B. 0.108 kg/mol
  • C. 0.027 kg/mol
  • D. 0.0635 kg/mol

Explanation

The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol or 0.018kg/mol.

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About Measurements

Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.

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