How-many-GRAMS-of-boron-are-present-in-2-86-grams-of-boron-tribromide-

1. How many GRAMS of boron are present in 2.86 grams of boron tribromide ? 
 grams boron.

2. How many GRAMS of boron tribromide can be produced from 2.91 grams of bromine ? 
 grams boron tribromide.

 
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