converting moles to grams

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Linda Arroyo 3J
Posts: 15
Joined: Fri Apr 06, 2018 11:01 am

converting moles to grams

Postby Linda Arroyo 3J » Tue Oct 16, 2018 4:00 pm

Hey everyone, I just wanted to make sure that I am converting correctly. If I am converting from moles to grams, would I just multiply the given moles with the molar mass of the given compound?

for example: L. 3 B) Calculate the mass of Li3N that will produce 0.650 mol LiH.
would i multiply the LiH moles with the molar mass of Li3N and then multiply it with the molar ratio too ?

Kate Chow 4H
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

Re: converting moles to grams

Postby Kate Chow 4H » Tue Oct 16, 2018 4:10 pm

Correct! To convert from moles to grams, you multiply by the molar mass. Use dimensional analysis if you are unsure.

L3b. 0.650mol LiH * 1 mol Li3N/2 mol LiH * 34.83 g Li3N/1 mol Li3N = mass of Li3N that will produce 0.650 mol LiH
You can see that all the units cancel out except for g Li3N, which is what you are looking for.

Hope this helps!

EllerySchlingmann1E
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

Re: converting moles to grams

Postby EllerySchlingmann1E » Tue Oct 16, 2018 4:11 pm

Hi,

Yeah, that's totally right. If you have the measured moles of a reactant and want to find the mass of a product, you just need to multiply by the molar ratio of the compounds and then by the molar mass of the product.

Kyither Min 2K
Posts: 60
Joined: Wed Oct 03, 2018 12:15 am

Re: converting moles to grams

Postby Kyither Min 2K » Fri Oct 19, 2018 2:54 pm

Yes! I think using dimensional analysis is very important when solving problems like these. Make sure that the units cancel out in the end to get what you want and make sure you're using correct values for each.


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