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Chemical formula of chlorophyll
C₅₅H₇₂O₅N₄Mg
Problem:
If the molar mass of the chlorophyll compound is 892 g, what is the percent by mass of magnesium?
A. 3.0%
B. 2.9%
C. 2.8%
D.2.7%
Answer:
D.2.7%
Given Data:
mass of chlorophyll = 893.51 g
mass of magnesium = 24.3 g
Percent by mass of magnesium = unknown
Solution:
% mass of magnesium = mass of magnesium ÷ mass of chlorophyll × 100
= 24.3 g ÷ 893.51 g × 100
= 0.02719 × 100
= 2.719 %
= 2.7 %
Answer:
The percent by mass of magnesium in chlorophyll is equal to 2.7%
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