Advertisements
Advertisements
प्रश्न
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
उत्तर
(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
संबंधित प्रश्न
Define the term:
Vapour density
Calculate the relative molecular mass of Potassium chlorate.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S=32)
Empirical formula of a compound is CH2O. If its empirical formula is equal to its vapour density, calculate the molecular formula of the compound.
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)
Samples of the gases O2, N2, CO2 and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of Oxygen, occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure :
What is the mass of CO2 in g?
When heated, potassium permanganate decomposes according to the following equation:
\[\ce{2KMnO4 -> \underset{solid residue}{K2MnO4 + MnO2} + O2}\]
Given that the molecular mass of potassium permanganate is 158 g, what volume of oxygen (measured at room temperature) would be obtained by the complete decomposition of 15.8 g of potassium permanganate? (Molar volume at room temperature is 24 litres). [K = 39, Mn = 55, O = 16]
Complete the following calculations. Show working for complete credit :
If the empirical formula of a compound is CH and it has a vapour density of 13, find the molecular formula of the compound.
Calculate the relative molecular mass of:
(NH4)2 Cr2O7
The atomic mass of Chlorine is 35.5. What is its vapour density?
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.
