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)
Advertisements
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
Calculate the relative molecular mass of Chloroform.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
Calculate the percentage composition of oxygen in lead nitrate [Pb(NO3)2]. [Pb = 207, N= 14, O = 16]
Potassium nitrate on strong heating decomposes as under :
2KNO3 → 2KNO2 + O2
Calculate : Weight of potassium nitrite formed.
(K = 39, 0 = 16, N = 14)
What weight of sulphuric acid will be required to dissolve 3g of magnesium carbonate?
[Mg = 24, C =12, 0 = 16 ]
MgCO3 + H2SO4 → MgSO4 + H2O+ CO2
If a crop of wheat removes 20 Kg of nitrogen per hectare of soil, what mass of the fertilizer calcium nitrate,Ca(NO3)2 would be required to replace nitrogen in 10 hectare field? (N = 14, O = 16, Ca = 40)
A compound 'X' consists of 4.8% of C and 95.2% of Br by mass.
If the vapour density of the compound is 252, what is the molecular formula of the compound?
Give two tests of the following:
Oxygen
Calculate the relative molecular mass of:
Ammonium chloroplatinate (NH4)2 PtCl6
Calculate the number of atoms of each kind in 5.3 grams of sodium carbonate.
Correct the statement, if required.
Under similar conditions of temperature and pressure, two volumes of hydrogen combined with two volumes of oxygen will give two volumes of water vapour.
