5. sample? Nitrogen (N), phosporus (P), and potassium (K) are the main nutrients in plant fertilizers. According to an industry convention, the numbers on the label refer to the mass % of N. P.O., and K,O. in the order. Calculate the N:P:K ratio of a 30:10:10 fertilizer in terms of moles of each elements, and express it as X:y:1.0. MPIRICAL & MOLECULAR FORMULA

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Nitrogen (

N

), Phosphorus (

P

) and Potassium (

K

) are the main nutrients in plant fertilizers. According to an industry convention, the numbers on the label refer to the mass

%

N

P_{2} O

and

K_{2} O

in that order. What is

N : P : K

ratio of a

28 : 14.2 : 4.7

fertilizer in terms of moles of each elements and expressing it as

x : y : 1.0

is :

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The main nutrients present in fertilizers are nitrogen, phosphorus, and __________.

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Nitrogen, phosphorous and potassium are regarded as essential plant nutrients. After a few years of continuous cultivation, the soil becomes poorer and poorer in materials supplying nitrogen, phosphorous and potassium to plants. If the soil is not compensated, it would become less productive and infertile. In order to maintain soil fertility, it is necessary to add materials containing nitrogen, phophorous and potassium in the form of fertilizers. Chemical substances which are added to the soil as to make up deficiency of essential elements are called chemical fertilizers. Every chemical compound of nitrogen, phosphorous and potassium cannot be used as a fertilizer. Substances to be used as fertilizers must have the following characteristics:
(a) it must be soluble in water
(b) it should be easily assimilated by plants
(c) it should be stable
(d) it should not disturb the $$pH$$ of the soil
(e) It should be cheap
The important nitrogenous fertilizers are:
(a) ammonium sulphate
(b) calcium cyanamide
(c) calcium ammonium nitrate
(d) urea
(e) basic calcium nitrate
The important phosphatic fertilizers are:
(a) calcium superphsophate
(b) nitrophosphate
(c) triple phosphate
(d) phosphatic slag
The commonly used potassium fertilizers are:
(a) potassium nitrate
(b) potassium chloride
(c) potassium sulphate
Fertilizers containing $$N, P$$ and $$K$$ in suitable adjusted proportions are known as NPK fertilizers.
The actual composition of nitrolim is :

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Question 16
Which one of the following nutrients is not available in fertilizers?

(a) Nitrogen
(b) Phosphorus
(c) Iron
(d) Potassium

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A compound of carbon, hydrogen and nitrogen contains three elements in the respective weight ratio of 9 : 1 : 3. Calculate its empirical formula. If its molecular weight is 108, what is its molecular formula?

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