Advertisements
Advertisements
प्रश्न
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 the nitrogen in a 10 hectare field?
Advertisements
उत्तर
Total area of the field = 10 hectare
∴ Total nitrogen that has to be replaced = 20 × 10
= 200 kg
Molecular mass of Ca(NO3)2 = 40 + 2 × 62 = 164
164 kg of Ca(NO3)2 contain 28 kg of nitrogen
Now, 28 kg of nitrogen is present in 164 kg of Ca(NO3)2
∴ 200 kg of nitrogen are present in `(164 xx 200)/28` kg of Ca(NO3)2 = 1171.4 kg
संबंधित प्रश्न
Prove the Following :
2 X V.D. = Molecular mass.
Calculate the relative molecular mass of Sodium acetate
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
Find the total percentage of oxygen in magnesium nitrate crystal Mg(NO3)2.6H2O.
[H = 1, N = 14, O = 16, Mg = 24]
A metal M, forms a volatile chloride containing 65.5% Chlorine. If the density of the chloride relative to hydrogen is 162.5, find the molecular formula of the chloride. [M = 56, Cl = 35.5]
What is the vapour density of ethylene? (Avogadro's number = 6 x 1023; Atomic weight of C = 12, H = 1; Molar volume = 22.4 litres at STP)
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 one word or phrase for the following:
Formation of ions from molecules.
Give two tests of the following:
Oxygen
Calculate the relative molecular mass of:
CH3COONa
What do you understand by the statement that ‘vapour density of carbon dioxide is 22’?
