Advertisements
Advertisements
Question
Calculate the percentage composition of calcium nitrate.
[Ca = 40 N = 14, O = 16]
Advertisements
Solution
Calcium nitrate Ca[NO3]
Molecular mass of Ca[NO3]2 = Ca + 2[N2 + 3(O)]
= 40 + 2[14 + 3 × 16]
= 40 + 2[14 + 48]
= 40 + 124
= 164
% of Ca = `40/164 xx 100 = 24.9`
% of N = `28/164 xx 100 = 17.07`
% of O = `96/164 xx 100 = 58.54`
APPEARS IN
RELATED QUESTIONS
Calculate the percentage of phosphorus in calcium hydrogen phosphate Ca(H2PO4)2 .
Calculate the percentage of phosphorus in calcium phosphate Ca3(PO4)2.
Find the percentage of water of crystallisation in CuSO4.5H2O. (At. Mass Cu = 64, H = 1, O = 16, S = 32)
Calculate the percentage of phosphorus in Calcium phosphate Ca3(PO4)2
Urea is a very important nitrogenous fertilizer. Its formula is CON2H4. Calculate the percentage of nitrogen in urea. (C = 12, O = 16, N = 14 and H = 1).
Some of the fertilizers are sodium nitrate NaNO3, ammonium sulphate (NH4)2SO4 and urea CO(NH2)2. Which of these contains the highest percentage of nitrogen?
An acid of phosphorus has the following percentage composition; Phosphorus = 38.27%; hydrogen = 2.47%; oxygen = 59.26%. Find the empirical formula of the acid and its molecular formula, given that its relative molecular mass is 162.
1 g of a mixture of sodium chloride and sodium nitrate is dissolved in water. On adding silver nitrate solution, 1.435 g of AgCl is precipitated.
\[\ce{AgNO3_{( aq)} + NaCl_{( aq)}-> AgCl_{(s)} + NaNO3}\]
Calculate the precentage of NaCl in the mixture.
A sample of ammonium nitrate when heated yields 8.96 litres of steam (measure at STP).
\[\ce{NH4NO3 -> N2O + 2H2O}\]
- What volume of dinitrogen oxide is produced at the same time as 8.96 litres of steam?
- What mass of ammonium nitrate should be heated to produce 8.96 litres of steam? (Relative molecular mass of ammonium nitrate is 80).
- Determine the percentage of oxygen in ammonium nitrate (O = 16).
Calculate the percentage of sodium in sodium aluminium fluoride (Na3AlF6) correct to the nearest whole number. (F = 19; Na = 23; Al = 27)
