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Algemene en technische scheikunde

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Oef<strong>en</strong>ing 2<br />

Vraag<br />

All of the substances listed below are fertilizers that contribute nitrog<strong>en</strong> to the soil. Which of<br />

these is the richest source of nitrog<strong>en</strong> on a mass perc<strong>en</strong>t basis?<br />

• Urea (NH2)2CO<br />

• Ammonium nitrate NH4NO3<br />

• Guanidine HNC(NH2)2<br />

• Ammonia NH3<br />

Oplossing<br />

Om de rijkste stikstofbron te bepal<strong>en</strong>, moet<strong>en</strong> we de gewichtsperc<strong>en</strong>tages van stikstof in elke<br />

kunstmest berek<strong>en</strong><strong>en</strong>. Voor ureum wordt dit:<br />

Voor ammoniumnitraat wordt dit:<br />

Voor guanidine wordt dit:<br />

Voor ammonia wordt dit:<br />

2 ∗ MN<br />

gew%N =<br />

M(NH2)2CO<br />

gew%N = 28<br />

60.05<br />

gew%N = 46.6 %<br />

2 ∗ MN<br />

gew%N =<br />

MNH4NO3<br />

gew%N = 28<br />

80.04<br />

gew%N = 35.0 %<br />

3 ∗ MN<br />

gew%N =<br />

MHNC(NH2)2<br />

gew%N = 42<br />

59.06<br />

gew%N = 71.1 %<br />

gew%N = MN<br />

MNH3<br />

gew%N = 14<br />

17.03<br />

gew%N = 82.2 %<br />

Qua gewichtsperc<strong>en</strong>tage is ammonia dus de rijkste bron aan stikstof.<br />

(22)<br />

(23)<br />

(24)<br />

(25)<br />

12

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