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In a lab experiment, 8.24 g of phosphorus reacts with bromine to form 72.01 g of...

In a lab experiment, 8.24 g of phosphorus reacts with bromine to form 72.01 g of phosphorus tribromide.

(a) Calculate the percentage by mass of P in phosphorus tribromide.

(b) How many grams of bromine reacted?

How do you know?

law of definite proportions

law of multiple proportions   

law of constant composition

law of conservation of mass

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