- A reaction of 37.5 g of 2Na and 55.1 g of Br2 yields 62.9 g of 2NaBr. What is the percent yield?

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If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
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