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
Give balanced chemical equations for the following conversions A, B, and C:
Aluminum carbide reacts with water according to the following equation:
\[\ce{Al4C3 + 12H2O -> 4Al(OH)3 + 3CH4}\]
- What mass of aluminum hydroxide is formed from 12g of aluminum carbide?
- What volume of methane at s.t.p. is obtained from 12g of aluminum carbide?
Calculate the percentage of water in ferrous sulphate crystals.
[Fe = 56, S = 32, O =16, H = 1].
Chlorine, nitrogen, ammonia and sulphur dioxide gases are collected under the same conditions of temperature and pressure.
Copy the following table which gives the volumes of the gases collected, and the number of molecules (X) in 20L of nitrogen.You are to complete the table by giving the number of molecules in th e other gases, in terms of X.
| Gas | Volume(litres) | Number of molecules |
| Chlorine | 10 | |
| Nitrogen | 20 | X |
| Ammonia | 20 | |
| Sulphur dioxide | 5 |
A compound 'X' consists of 4.8% of C and 95.2% of Br by mass.
Name the type of chemical reaction by which X can be prepared from ethane.
The equation for the burning of octane is:
\[\ce{2C6H18 + 25O2 -> 16CO2 + 18H2O}\]
If the relative molecular mass of carbon dioxide is 44, what is the mass of carbon dioxide produced by burning two moles of octane?
Give one word or phrase for the following:
Formation of ions from molecules.
Calculate the relative molecular mass of:
Potassium chlorate
Find the weight of 0.2 mole of H2 gas.
The vapour density of CH3OH is ______. (At. Wt. C = 12, H = 1, O = 16)
