HELP PLEASE...
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Calculate the percentage of nitrogen in urea CO(NH2)2.
(Atomic mass: N=14, C=12, H=1)
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all the best : D

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please refer to the attachment

Thanks

the answer is 0.42 is that is an option. this question provides no info

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.