when to multiply empirical formula  [ENDORSED]

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Divya Pimparkar 1E
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when to multiply empirical formula

Postby Divya Pimparkar 1E » Sun Oct 07, 2018 10:40 pm

When you divide the molar mass of the molecular formula by the molar mass of the empirical formula, if i get 3.5, do i multiply by 4 or 3?

Lily Benitez 2G
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Re: when to multiply empirical formula

Postby Lily Benitez 2G » Sun Oct 07, 2018 10:43 pm

You multiply by the smallest possible value; that will give you a whole number.

Dayna Pham 1I
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Re: when to multiply empirical formula

Postby Dayna Pham 1I » Sun Oct 07, 2018 10:44 pm

If you are at 3.5, you can multiply by 2 to get 7! Hope this helps.

Venya Vaddi 1L
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Re: when to multiply empirical formula

Postby Venya Vaddi 1L » Mon Oct 08, 2018 5:15 pm

In these problems, you always want to make sure you are multiplying by a whole number to ensure you have whole numbers of atoms.

Maria Solis Disc 1G
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Re: when to multiply empirical formula

Postby Maria Solis Disc 1G » Mon Oct 08, 2018 5:59 pm

You would multiple all the coefficients by 7, since you can't have 3.5 as a coefficient. You can't use 3 or 4 because that wouldn't uphold the exact proportion of 3.5.

Rehan Chinoy 1K
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Re: when to multiply empirical formula  [ENDORSED]

Postby Rehan Chinoy 1K » Tue Oct 09, 2018 10:51 am

You want to make sure all the stoichiometric coefficients are whole numbers. So if you have 3.5, you will most likely multiply all of the coefficients by 2 or a multiple of 2 to ensure whole numbers.

AlyssaBei_1F
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Joined: Fri Sep 28, 2018 12:17 am

Re: when to multiply empirical formula

Postby AlyssaBei_1F » Tue Oct 09, 2018 3:17 pm

You want to multiply by the smallest possible number that will give you a whole number. I would multiply 3.5 by 2 to get 7.

Mayaal_Khan_4H
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Joined: Fri Sep 28, 2018 12:28 am

Re: when to multiply empirical formula

Postby Mayaal_Khan_4H » Tue Oct 09, 2018 3:29 pm

You need to multiple the answer by the smallest possible number which would turn the answer to a whole number. For example, if your answer is 1.33, you will have to multiply it by 3 to get 4.

EllaBerry
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Joined: Fri Sep 28, 2018 12:29 am

Re: when to multiply empirical formula

Postby EllaBerry » Thu Oct 11, 2018 10:15 am

Always multiply by the smallest number possible to get a whole number. In this case it sounds like you would multiply by 2 so that the 3.5 would turn into 7, a whole number.

Julia Jones 1G
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Joined: Fri Sep 28, 2018 12:16 am

Re: when to multiply empirical formula

Postby Julia Jones 1G » Thu Oct 11, 2018 10:20 am

If you get a number like 3.5, multiply everything by 2 to get the whole number of 7 (this will be your subscript for the element in the molecular formula)


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