Empirical formula [ENDORSED]

Sunjum Singh 1I
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

Empirical formula

When solving for Empirical Formula and you have moles such as 2.5 or 2.7, how do you know which number is the best to multiply each by to get whole numbers?

Marina Souliman 1K
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

Re: Empirical formula

I've only been taught to make educated guesses about what to multiply to get a whole number. For example, with 2.7 I focus on the .7 and try to think of multiples of 7 that end in 0 so that I'd manage to get a whole number. For 2.7, I've found the smallest number I could use to multiply is 10.

For 2.5, I know the smallest multiple of 5 that would lead to a number ending in 0 is 10. So, I know to multiply it by 2.

Posts: 32
Joined: Fri Apr 06, 2018 11:05 am
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Re: Empirical formula  [ENDORSED]

I agree. I also just use educated guesses. Once you find what number works best, you will remember it for next time so it just becomes second nature.

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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Re: Empirical formula

Don't worry so much about what number is best to multiply because it should be fairly clear on the assessments :)

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