Home
Class 11
CHEMISTRY
A mixture of CaCO(3) and MgCO(3) weighin...

A mixture of `CaCO_(3)` and `MgCO_(3)` weighing `1.84 g` on heating left a residue weighing `0.96 g`. Calculate the percentage of each in the mixture.

Text Solution

Verified by Experts

Calcium carbonate and magnesium carbonate on heating give CaO and MgO as residues:
`CaCO_(3) overset("heat") to CaO + CO_(2)`
`underset(84 g)(MgCO_(3)) overset("heat") to underset(40 g)(MgO + CO_(2))`
Let `CaCO_(3)` present in the mixture = x g.
Wt. of `MgCO_(3)` in the mixture = (1.84 -x)g
Now, 100 g of `CaCO_(3)` gives CaO = 56 g
x g of `CaCO_(3)` give CO `=56/100 xx x g`
Similarly, 84 g of `MgCO_(3)` gives MgO = 40 g
`(1.84-x) g` of `MgCO_(3)` give `MgO = 40/84 xx (1.84-x)`
Total residue obtained.
`(56 x)/100 + 40/84 (1.84 -x) = 0.96`
4704x + 7360 - 4000 x = 8064
704 x = 704
`x=704/704 = 1 g`
Weight of `CaCO_(3)` in the mixture = 1g
Weight of `MgCO_(3)` in the mixture = 1.84 -1 = 0.84 g
% of `CaCO_(3) =1/(1.84) xx 100 = 54.35%`
% of `MgCO_(3) = (0.84)/(1.84) xx 100 = 45.65%`
Promotional Banner

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    MODERN PUBLICATION|Exercise PRACTICAL PROBLEMS|70 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    MODERN PUBLICATION|Exercise CONCEPTUAL QUESTION 1|12 Videos

  • S-BLOCK ELEMENTS ( ALKALI AND ALKALINE EARTH METALS )

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos

  • STATES OF MATTER : GASES AND LIQUIDS

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos

Similar Questions

Explore conceptually related problems

3.75 g of a mixture of CaCO_3 and MgCO_3 is dissolved in 1 L of 0.1 M HCl to liberate 0.04 " mol of " CO_2 . Calculate (a). The percentage of each compound in the mixture. (b). The amound of acid used. (c). The amound of acid left after the reaction.

2.0 g sample contain mixture of SiO_(2) and Fe_(2)O_(3) , on very strong heating leave a residue weighing 1.96 g. The reaction responsible for loss of weight is Fe_(2)O_(3)(s) rarr Fe_(3)O_(4)(s) +O_(2)(g) . What is the percentage by mass of SiO_(2) in original sample ? [Atomic mass : Fe = 56, O = 16, Si = 28]

2.0 g of a sample contains mixture of SiO_(2) and Fe_(2)O_(3) . On very strong heating , it leaves a residue weighing 1.96 g . The reaction responsible for loss of mass is given below . Fe_(2)O_(3)(s) to Fe_(3)O_(4)(s) + O_(2)(g) , (unbalance equation) lt brgt What is the precentage by mass of SiO_(2) in original sample ?

A mixture contains equi-molar quantities of carbonates of two bivalent metals. One metal is present the extent of 13.5% by weight in the mixture and 2.50 g of the mixture on heating leaves a residue of 1.18 g . Calculate the percentage by weight of the other metal.