How many grams of bromine are in 1.57 grams of phosphorus tribomide?

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How many grams of bromine are in 1.57 grams of phosphorus tribomide?

How many grams of bromine are in 1.57 grams of phosphorus tribomide?

and

Calculate the mass percent oxygen in magnesium nitrate.

Thankyou!!

2007-05-14 16:13:13 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

1 answers

Atomic weights: P=31 Br=80 Mg=24 N=14 O=16 PBr3=271 Mg(NO3)2=210

1.57gPBr3 x 240gBr/271gPBr3 = 1.39g Br

96gO/210gMg(NO3)2 x 100% = 45.7%

In PBr3, 3 x 80 = 240. In Mg(NO3)2, 6 x 16 = 96.

2007-05-14 16:39:38 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋