Advertisements
Advertisements
Question
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)
Advertisements
Solution
Molecular weight of Ca(NO3)2 = 164
164 parts by weight of calcium nitrate contains 28 parts by weight of nitrogen .
28 Kg of nitrogen will be replaced by = 164 Kg of Ca(N03)2
20 Kg of nitrogen will be replaced by = 164 x 20/28
= 117.14 kg
For, 1 hectare of field 20Kg of nitrogen will be replaced by = 117.14 Kg of Ca(NO3)2
For, 10 hectare of field 20Kg of nitrogen will be replaced by = 117.14 x 10 = 1171.4Kg
Hence, 1171.4 Kg of the fertilizer calcium nitrate,Ca(NO3)2 would be required to replace nitrogen in 10 hectare field .
APPEARS IN
RELATED QUESTIONS
Aluminium carbide reacts with water according to the following equation :
`Al_4C_3 + 12H_2O-> 4Al(OH)_3 + 3CH_4`
1)What mass of aluminium hydroxide is formed from 12g of aluminium carbide?
2) What volume of methane at s.t.p. is obtained from 12g of aluminium carbide?
[Relatively molecular weight of `Al_4Cl_3 = 144; Al(OH)_3 = 78]`
Define the term:
Vapour density
Water can split into hydrogen and oxygen under suitable conditions. The equations representing the change is: 2H2O(I) → 2H2 (g) + O2(g)
Ammonia burns in oxygen and the combustion in the presence of a catalyst may be represented as:
2NH3 (g) +21/2O2 (g) → 2NO (g) + 3H2O (I)
What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?
A flask contains 3.2g of sulphur dioxide. Calculate the following: The number of molecules of sulphur dioxide present in the flask.
Give two tests of the following:
Oxygen
Calculate the relative molecular mass of:
CH3COONa
Calculate the relative molecular mass of:
CHCl3
Find the weight of 0.5 mole of O2.
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.
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?
