Plasma is the most least form on Earth and we hardly use it but it is the most common in the universe because it is mostly loacted in space
<u>Answer:</u> The percent composition of fluorene is 33.08 % and benzoic acid is 36.03 %.
<u>Explanation:</u>
We are given:
Mass of mixture = 544 mg
Mass of fluorene after purification = 
Mass of benzoic acid after purification = 196 mg
To calculate the percentage composition of a substance in a mixture, we use the equation:

<u>For fluorene:</u>

Hence, the percent composition of fluorene is 33.08 %
<u>For benzoic acid:</u>

Hence, the percent composition of benzoic acid is 36.03 %
I see you have access to the internet. Google 'Kelvin to C', and input 251. You'll get -22.15.
ANSWER
An atom of element is electrically neutral because the number of positive protons are equal to number of negative electrons.