Multiple choice Which of the following is the correct molecular formula of chlorophyll a? C55H70O6N4Mg C55H70O5N4Mg C54H70O6N4Mg C55H72O5N4Mg C35H30O5N4Mg Reveal answer Fill a bubble to check yourself D Correct answer Explanation Molecular formula of chlorophyll a is C55H72O5N4Mg.