Empirical formula  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

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

Empirical formula

Postby Sunjum Singh 1I » Fri Apr 06, 2018 6:08 pm

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

Postby Marina Souliman 1K » Fri Apr 06, 2018 9:26 pm

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.

Alexandra Wade 1L
Posts: 32
Joined: Fri Apr 06, 2018 11:05 am
Been upvoted: 1 time

Re: Empirical formula  [ENDORSED]

Postby Alexandra Wade 1L » Sat Apr 07, 2018 12:11 am

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.

Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

Re: Empirical formula

Postby Chem_Mod » Sat Apr 07, 2018 11:34 am

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

Return to “Empirical & Molecular Formulas”

Who is online

Users browsing this forum: No registered users and 2 guests