What is the % yield if 12g of magnesium is dissolved in hydrochloric acid to produce 20g of magnesium chloride?

First we need to write the balanced equation for the reaction. In this case it is Mg + 2HCl -> MgCl2 + H2. Now we need to work out the maximum theoretical yield of MgCl2 from 12g of Mg. 12g of Mg is 0.5 moles, so a maximum of 0.5 moles of MgCl2 can be created because the reaction ratio is 1:1 as our equation shows. 0.5 moles of MgCl2 weighs 47.5g. Finally we can use the equation % yield = (actual yield / theoretical yield) x 100. In this example, (20 / 47.5) x 100 = 42.1%.

Answered by Holly W. Chemistry tutor

6451 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

Ethane is an organic compound. Please (a) write down the molecular formula of ethanoic acid and (b) verify the type of organic compound ethanoic acid belongs.


What is condensation polymerisation ?


Explain why fluorine and chlorine are in the same group of the periodic table.


You are given 120g of Calcium. How many moles have you been given? (Ar =40)


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences