Multiple choice Molecular formula of chlorophyll a is _____________________. C35H30O5N4Mg C55H70O6N4Mg C55H71O6N4Mg C54H70O6N4Mg C55H72O5N4Mg Reveal answer Fill a bubble to check yourself E Correct answer Explanation The molecular formula of chlorophyll a is C55H72O5N4Mg.