0 votes
193 views
in Chapter 4 Measurement of Matter by (98.9k points)
edited

Explain with examples what is meant by a 'mole' of a substance.

1 Answer

0 votes
by (98.9k points)
selected by
 
Best answer

A mole is that quantity of a substance whose mass in grams is equal in magnitude to the molecular mass of that substance in daltons. The SI unit is mole.

Examples

The molecular mass of oxygen is 32 u; 32 g oxygen is 1 mole of oxygen.

The atomic mass of carbon is 12 u; 12 g carbon is 1 mole of carbon.

The molecular mass of H2O is 18 u; 18 g H2O is 1 mole of water.

Number of moles of Mass of substance (n) =  \(\frac{\text{Mass of substance in grams}}{Molecular mass of substance}\)

Related questions

Doubtly is an online community for engineering students, offering:

  • Free viva questions PDFs
  • Previous year question papers (PYQs)
  • Academic doubt solutions
  • Expert-guided solutions

Get the pro version for free by logging in!

5.7k questions

5.1k answers

108 comments

561 users

...