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Chapter 3: Q3.141CP (page 138)

What mass % of ammonium sulfate, ammonium hydrogen phosphate, and potassium chloride would you use to prepare 10/10/10 plant fertilizer (see Problem 3.140)?

Short Answer

Expert verified

The mass percentage are 47% (NH4)2SO4, 18% (NH4)2HPO4 and 16% KCl.

Step by step solution

01

Finding Moles of N, P and K

On finding the moles,

Moles of N=10 g N×1 mol N14.01 g N=0.71 mol NMoles of P=10 g P2O3×1 mol P2O5141.94 g P2O5×2 mol P1 mol P2O5=0.14 mol PMoles of K=10 g K2O×1 mol K2O94.2 g K2O×2 mol K1 mol K2O=0.21 mol K

02

Finding the mass 

On finding the mass,

Mass of (NH4)2SO4=0.71 mol N×1 mol (NH4)2SO42 mol N×132.14 g (NH4)2SO41 mol(NH4)2SO4=47 gMass of (NH4)2HPO4=0.14 mol P×1 mol (NH4)2HPO41 mol P×132.06 (NH4)2HPO41 mol (NH4)2HPO4=18 gMass of KCl=0.21 mol K×1 mol KCl1 mol K×74.55 g KCl1 mol KCl=16 g

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