Chemistry, 20.07.2019 11:40 nallwly

Asample of a substance containing only magnesium and chlorine was tested in the lab and was found to be composed of 74.5% chlorine by mass. if the total mass of the sample was 190.2 grams, what was the mass of the magnesium? a) 24.3 g b) 48.5 g c) 70.9 g d) 142 g i know the answer is b, but i don't understand

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Asample of a substance containing only magnesium and chlorine was tested in the lab and was found to...