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Nucleophilic Substitution Reaction

1.84g mixture...

Question

1.84g mixture of CaCO₃and MgCO₃ was heated to a constant weight till 0.96g residue was formed.Percentage of MgCO₃in sample was ?

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Solution

$N u m b e r o f m o l e s o f C a C O_{3} = X N u m b e r o f m o l e s o f M g C O_{3} = Y M o l a r m a s s o f C a C O_{3} = 100 g M o l a r m a s s o f M g C O_{3} = 84.3 m o l e T h u s 100 X + 84.3 Y = 1.84 - - - - - 1 (a s t h e m i x t u r e w e i g h t i s = 1.84 g) O n h e a t i n g t h e m i x t u r e C O_{2} i s e x p e l l e d o u t a n d b o t h o x i d e s r e m a i n i n t h e r e s i d u e . C a C O_{3} + M g C O_{3} \overset{∆}{\to} C a O + M g O + 2 C O_{2} M o l a r m a s s o f C a O = 56 g M o l a r m a s s o f M g O = 40.3 g A s t h e n u m b e r o f m o l e s o f o x i d e s a r e s a m e w i t h c a r b o n a t e s 56 X + 40.3 Y = 0.96 - - - - - - 2 (g i v e n t h a t h e r e s i d u a l w e i g h t i s 0.96 g) S o l v e e q u a t i o n 1 a n d 2 W e g e t X = 0.0098 a n d Y = 0.01 M a s s o f C a C O_{3} = 100 \times 0.0098 = 0.98 g M a s s o f M g C O_{3} = 84.3 \times 0.01 = 0.86 g M a s s % o f C a C O_{3} = \frac{0.98}{1.84} \times 100 = 53.26 % M a s s % o f M g C O_{3} = \frac{0.86}{1.84} \times 100 = 46.74 %$

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Q. 1.84 g of a mixture of

C a C O_{3}

M g C O_{3}

was heated to a constant weight. The constant weight of the residue was found to be 0.96 g. calculate the percentage composition of the mixture..

(C a = 40, M g = 24, C = 12, O = 16)

Q. A mixture of calcium and magnesium carbonates weighing 1.4 g was strongly heated until no further loss of weight was perceived. The residue weighed 0.76 g. What percentage of

M g C O_{3}

was present in the mixture?

Q. 92 g mixture of

C a C O_{3}

M g C O_{3}

heated strongly in an open vessel. After complete decomposition of the carbonates it was found that the weight of residue left behind is 48 g. Find the mass of

M g C O_{3}

in grams in the mixture.

1.64

g of a mixture of

C a C O_{3}

M g C O_{3}

was dissolved in

50

0.8 M H C l

. The excess of acid required

16

0.25 M N a O H

for neutralization. Calculate the percentage of

C a C O_{3}

A sample containing only caco3 and Mgco3 is ignited to CaO and Mgo . The mixture of oxides produced weight exactly half as much as the original sample .

Calculate the percentage of caco3 and mgco3 in the sample

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