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wlad13 [49]
3 years ago
6

The label of a fertilizer states that the fertilizer contains 18.1% p4o10 by mass. What is the mass percentage of phosphorus in

the fertilizer?
Chemistry
1 answer:
timurjin [86]3 years ago
7 0

The fertilizer contains 7.90 % P by mass.

<em>Assume</em> you have 100 g of fertilizer.

<em>Mass of P₄O₁₀</em> = 100 g fertilizer × 18.1 g P₄O₁₀/100 g fertilizer = 18.1 g P₄O₁₀

<em>M_r of P₄O₁₀</em> = 4 × 30.97 + 10× 16.00 = 123.88 + 160.00 = 283.88

<em>Mass of P</em> = 18.1 g P₄O₁₀ × (123.88 g P/283.88 g P₄O₁₀) = 7.90 g P  

<em>Mass % P</em> = mass/total mass × 100 % = 7.90 g /100 g × 100 % = 7.90 %

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