What is a mole?

A mole is the amount of a substance which contains as many particles (atoms, ions, molecules etc) of the substance as there are carbon atoms in 12g of 12C - this is exactly 6.02 × 1023 atoms. This formula is known as the Avogrado number. The mass in grams of any element is equal to its relative atomic mass - for example, one mole of Calcium is approximately 40g.

MN
Answered by Molly N. Chemistry tutor

2661 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Predict the effect of an increase in pressure and temperature on the production of ammonia in the reaction: N2(g) + 3H2(g) <-> 2NH3 (g) , where the change in enthalpy is -92.4 kJ


What type of reaction do haloalkanes undergo with nucleophiles?


Why does propanol have a higher boiling point than propanone, propanal or methyl ethanoate?


Figure 1 shows a maxwell-Boltzmann distribution of molecular energies of a sample of gas at a fixed temperature. (a) Label the y axis. (b) On Figure 1, sketch a maxwell-Boltzmann distribution for the same sample of gas at a lower temperature.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning