3.89 kg P2O5 must be used to supply 1.69 kg Phosphorus to the soil.
The molecular mass of P2O5 is
P2 = 2* 31 = 62
O5 = 5 * 16 = 80
Molecular Mass = 142
Set up a Proportion
142 grams P2O5 supplies 62 grams of phosphorus
x kg P2O5 supplies 1.69 kg of phosphorus
Though this might be a bit anti intuitive, you don't have to convert the units for this question. The ratio is all that is important.
142/x = 62/1.69 Cross multiply
142 * 1.69 = 62x combine the left
239.98 = 62x Divide by 62
239.98/62 = x
3.89 kg of P2O5 must be used.
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