converting moles to grams

[Linda Arroyo 3J]

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]

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]

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]

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.