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### Multiplying to get an integer in the empirical formula

Posted: **Wed Oct 03, 2018 8:06 pm**

by **Dayna Pham 1I**

Whatâ€™s the threshold of rounding up and down when calculating the empirical formula versus multiplying to get a whole number?

Is it 0.75 and up, round up; 0.25 and down, round down? When do we know to multiply to get a whole number for the empirical formula?

### Re: Multiplying to get an integer in the empirical formula

Posted: **Wed Oct 03, 2018 8:21 pm**

by **Jayde Felix 4H**

I believe that you know to multiply to get a whole number as your final step in finding the empirical formula.

### Re: Multiplying to get an integer in the empirical formula

Posted: **Wed Oct 03, 2018 9:40 pm**

by **Annalyn Diaz 1J**

For an empirical formula, the numbers must be whole numbers, not numbers like 1.33 or 2.5, etc. In such case that you don't get a whole number, you would multiply that by another number to make it whole. But to address your question regarding the threshold for rounding, I believe Dr. Lavelle mentioned that rounding up or down from a number is only acceptable if the rounded number is less than 5% error. hope this helps!

### Re: Multiplying to get an integer in the empirical formula

Posted: **Wed Oct 03, 2018 10:18 pm**

by **Sarah Zhao 4C**

Multiply anything that isn't less than .2 away from a whole number

### Re: Multiplying to get an integer in the empirical formula

Posted: **Wed Oct 03, 2018 10:18 pm**

by **Sarah Zhao 4C**

Multiply anything that isn't less than .2 away from a whole number