1 answer

The mass of 0.25 moles of methane?

Question:

I'm not really sure how to work it out.


Answers

Well the molar mass of methane is #16.04*g#...we write #16.04*g*mol^-1#...

Explanation:

And how did we get that? Well, look at the Periodic Table in front of you (of course there must be one in front of you given that you doing your chemistry homework....

Hydrogen, has a molar mass of #1.00794*g*mol^-1#, and carbon has a molar mass of #12.00*g*mol^-1#...and we sum them together appropriately to get the molar mass of the molecule methane...

#"Molar mass of methane"={12.00+4xx1.00794}*g*mol^-1#

#=16.04*g*mol^-1#

And we want the mass of a #1/4*mol#...#1/4*cancel(mol)xx16.04*g*cancel(mol^-1)=4.01*g#

Note the dimensional consistency of the calculation. We wanted an answer in #g#...and the order of operations gave us an answer in GRAMS as required.

.

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