Advertisements
Advertisements
Question
The usefulness of a fertilizer depends upon percentage of nitrogen present in it. Find which of the following is a better fertilizer:
(a) Ammonium nitrate [NH4NO3]
(b) Ammonium phosphate [(NH4)3PO4 (N=14,H=1,O=16,P=31)
Solution
(a) Percentage of nitrogen in Ammonium nitrate [NH4NO3]:
(N)2 + (H)4 + (O)3
14 x 2 + 1 x 4 + 3 x 16 = 80.
So, the molecular mass of NH4NO3 = 80.
80 by weight of NH4NO3 contain 28 parts by weight of nitrogen .
100 parts will contain = 28 x 100 /80 = 35‰
So, the percentage composition of nitrogen in Ammonium nitrate is 3535‰
(b) Percentage of nitrogen in Ammonium phosphate [(NH4)3PO4]:
(N)3 + (H)12 +P + (O)4
14 x 3 + 1 x 12+ 31 + 16 x 4 = 149 .
So, the molecular mass of NH4NO3 = 149 .
149 by weight of (NH4)3PO4.contain 42 parts by weight of nitrogen .
100 parts will contain = 42 x 100 /149 = 28.18‰
So, the percentage of nitrogen in ammonium phosphate is 28.18‰
Since the percentage of nitrogen is more in Ammonium nitrate so it is a better fertilizer.
APPEARS IN
RELATED QUESTIONS
Define the term: Vapour density.
Fill in the blank.
Molecular weight of a gas is twice its __________.
Calculate the percentage of water in ferrous sulphate crystals.
[Fe = 56, S = 32, O =16, H = 1].
An organic compound has the following percentage composition: C = 12.76%, H = 2.13%, Br = 85.11%. The vapour density of the compound is 94. Find out its molecular formula.
Find the total percentage of oxygen in magnesium nitrate crystal Mg(NO3)2.6H2O.
[H = 1, N = 14, O = 16, Mg = 24]
Washing soda has the formula Na2CO3.10H2O.What is the mass of anhydrous sodium carbonate left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
Calculate the percentage of sodium in sodium aluminium fluoride (Na3AIF6).
[F = 19, Na = 23, Al = 27]
Give one word or phrase for the following:
Formation of ions from molecules.
Which of the following would weigh most?
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure. What mass of carbon dioxide can it hold under similar conditions of temperature and pressure?
