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Chemistry

Answered

21) What is the percent by mass of bromine in the compound MgBr₂?
A) 13.2%
B) 43.4%
C) 56.6%
D) 86.8%

Answer :

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Answer:

D 86.8%

Explanation:

Two bromines mole wt = 2 * 79.9 = 159.8 gm (from periodic table)

Mg = 24.3 gm

159.8 / ( 159.8 + 24.3) = .868 = 86.8 %

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