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
Commercial sodium hydroxide weighing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excess silver nitrate solution formed a precipitate weighing 14.3 g. What is the percentage of sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is
\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]
[Relative molecular mass of NaCl = 58, AgCI = 143]
Find the percentage of water of crystallisation in CuSO4.5H2O. (At. Mass Cu = 64, H = 1, O = 16, S = 32)
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?
Find the percentage of boron in Na2B4O7.10H2O. [H = 1, B = 11, O = 16, Na = 23].
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 composition of calcium chloride.
[Ca = 40, Cl = 35.5]
Find the percentage of nitrogen in ammonia.
State the term for the following:
The formula which represents the simplest ratio between the atoms of elements present in a compound.
Empirical formula of Ethyne.
A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is ______.
(Given atomic masses of A = 64; B = 40; C = 32
