How many moles are in 50g of NaCl.

Using the formula mass=Mr * moles we can rearrange this so it equals moles= mass / Mr. We are told the mass of the NaCl is 50g however we need to work out the Mr (relative formula mass) of the NaCl too. We do this by looking up the relative atomic masses of Na and Cl in the periodic table. Na has an atomic mass of 23 and Cl is 35.5. So the Mr(NaCl)= 23 + 35.5 = 58.5. Putting all of this into our moles equation gives us the answer: moles= 50/58.5 = 0.855 moles (3sf).

KH
Answered by Katy H. Chemistry tutor

25081 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

What is the difference between Ionic and Covalent bonding


Write a balanced chemical symbol equation for a reaction between Potassium and Water, including state symbols?


How do I calculate bond enthalpy from a chemical reaction?


What is the difference between an exothermic and an endothermic reaction?


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