Advertisements
Advertisements
Question
The reaction of potassium permanganate (VII) with acidified iron (II) sulphate is given below:
2KMno4 + 10FeSO4 + 8H2O → K2SO4 + 2MnSO4 + 5Fe2(SO4)3 + 8H2O
If 15.8g of potassium permanganate (VII) was used in the reaction, calculate the mass of iron (II) sulphate used in the above reaction.
Advertisements
Solution
Molecular weight of KMnO4 = 39 + 55 + 16 x 4 = 158
Molecular weight of K2SO4 = 2 x 39 + 32 + 16 x 4 = 174
Molecular weight of FeSO4 = 56 + 32 + 64 = 152
2 x 158g of KMnO4 yields= 174g of K2SO4.
So, 15.8g of KMnO4 will yield = 174 x 15.8/2 x 158 = 8.7g of K2SO4 .
174g of K2SO4 yields 152g of FeSO4
So, 8.7 g of K2SO4 will yield = 152 x 8.7/174 = 7.6 g of FeSO4.
Hence, 7.6g of iron (II) sulphate is used in the above reaction.
APPEARS IN
RELATED QUESTIONS
Calculate the relative molecular mass of Ammonium sulphate.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
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?
Mention the term defined by the following sentence:
The mass of a given volume of gas compared to the mass of an equal volume of hydrogen.
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]
Samples of the gases O2, N2, CO2 and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of Oxygen, occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure :
What is the mass of CO2 in g?
A flask contains 3.2g of sulphur dioxide. Calculate the following: The number of molecules of sulphur dioxide present in the flask.
Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H5).
(Atomic mass: C = 14, O = 16, H = 1, Molar Volume = 22.4 dm3 at STP.)
Calculate the relative molecular mass of:
Ammonium chloroplatinate (NH4)2 PtCl6
Which of the following contains maximum number of molecules?
Calculate the mass of nitrogen supplied to soil by 5 kg of urea [CO(NH2)2].
[O = 16; N = 14; C = 12; H = 1]
