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 the nitrogen in a 10 hectare field?
Advertisements
Solution
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
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)
An organic compound has the following percentage composition: C = 12.76%, H = 2.13%, Br = 85.11%. The vapour density of the compound is 94. Find out its molecular formula.
If the relative molecular mass of A is 90, what is the molecular formula of A?
Concentrated nitric acid oxidizes phosphorous to phosphoric acid according to the following equation :
P + 5HNO3 → H3PO4 + H2O + 5NO2
What mass of phosphoric acid can be prepared from 6 .2 g of phosphorous?
Washing soda has the formula Na2CO3.10H2O.What is the mass of anhydrous sodium carbonate left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
A certain gas 'X' occupies a volume of 100 cm3 at S.T.P. and weighs 0.5 g. Find its relative molecular mass.
Give two tests of the following:
Oxygen
Calculate the relative molecular mass of:
(NH4)2SO4
Calculate the volume occupied at S.T.P. by 2 moles of SO2.
The following question refers to one mole of chlorine gas.
If the relative atomic mass of chlorine is 35.5, what will be the mass of 1 mole of chlorine gas?
