Theoretical yield

Moderators: Chem_Mod, Chem_Admin

304976622
Posts: 25
Joined: Wed Nov 15, 2017 3:01 am

Theoretical yield

Postby 304976622 » Tue Oct 08, 2019 4:56 pm

Based on the molar ratios in a balanced chemical equation a student expects 0.20 moles of product. If the molar mass of the product is 81 g.mol-1 what is the theoretical yield?

Can someone please show the steps for this problem.

Sion Hwang 4D
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

Re: Theoretical yield

Postby Sion Hwang 4D » Tue Oct 08, 2019 5:08 pm

You multiply the amount of moles produced by the molar mass.
Hence, 0.20 mol x 81 g/mol = 16.2 g of product.

Caitlyn Tran 2E
Posts: 100
Joined: Fri Aug 09, 2019 12:15 am

Re: Theoretical yield

Postby Caitlyn Tran 2E » Wed Oct 09, 2019 12:13 am

Theoretical yield is just the expected mass of product. The question already presents the expected number of moles of product, so the only thing you have to do is convert the expected number of moles to product to the mass of product expected. This can be accomplished by using the molar mass of the product they provided as a conversion factor in dimensional analysis.

Lauren Tanaka 1A
Posts: 109
Joined: Sat Aug 17, 2019 12:18 am

Re: Theoretical yield

Postby Lauren Tanaka 1A » Wed Oct 09, 2019 10:44 am

The theoretical yield is the expected mass of the products that you would find through your calculations. It is the ideal amount of product that is produced from a reaction and not the actual yield since it does not take into account impurities and other factors that may alter the products. You calculate it by multiplying the moles of the product by the molar mass using dimensional analysis.

salvadorramos3k
Posts: 72
Joined: Wed Sep 18, 2019 12:18 am

Re: Theoretical yield

Postby salvadorramos3k » Fri Oct 11, 2019 12:56 am

So in the problem, they already gave you the theoretical yield, which is the amount expected should the entire experiment should go according to plan. Since they already gave you the theoretical yield in moles, you just need to convert it to grams by multiplying by the molar mass of the compound.

andrewcj 2C
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: Theoretical yield

Postby andrewcj 2C » Fri Oct 11, 2019 1:41 am

Dimensional analysis will reveal that the units cancel out, and you end up with an answer in grams when you multiply the 2 quantities.


Return to “Limiting Reactant Calculations”

Who is online

Users browsing this forum: No registered users and 0 guests