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Limiting Reagent or Reactant

CrCl3H12O6 lo...

Question

$C r C l_{3} H_{12} O_{6}$ loses $13.5 %$ water on treatment with conc. $H_{2} S O_{4}$ . Number of water molecules lost is____________.

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Solution

$C r C l_{3} H_{12} O_{6}$ loses $13.5 %$ water on treatment with conc. $H_{2} S O_{4}$ . Number of water molecules lost is 2. The molar mass of $C r C l_{3} H_{12} O_{6}$ is 266.5 g.
Thus the amount of water lost by 1 mole of $C r C l_{3} H_{12} O_{6}$ is $266.5 g \times \frac{13.5}{100} = 36 g$ This corresponds to 2 moles of water as the molar mass of water is 18 g/mol.

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Similar questions

A, B and C are three complexes of chromium (III) with the empirical formula

H_{12} O_{6} C l_{3} C r

. All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated

H_{2} S O_{4}

, whereas complexes B and C lose 6.75% and 13.5% of their original weight respectively, on treatment with concentrated

H_{2} S O_{4}

.

Thus, loss in weight on treatment with concentrated

H_{2} S O_{4}

A, B and C are three complexes of chromium (III) with the empirical formula

H_{12} O_{6} C l_{3} C r

. All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated

H_{2} S O_{4}

, whereas complexes B and C lose 6.75% and 13.5% of their original weight respectively, on treatment with concentrated

H_{2} S O_{4}

.

Thus, select the correct statement :

A, B

C

are three complexes of chromium(III) with the empirical formula:

H_{12} O_{6} C l_{3} C r

. All the three complexes have water and chloride ions as ligands. Complex

A

does not react with concentrated

H_{2} S O_{4}

, whereas complexes

B

C

6.75 %

13.5 %

of their original weight, respectively, on treatment with concentrated

H_{2} S O_{4}

C

[C r (H_{2} O)_{x} C l_{y}] C l \cdot z H_{2} O,

find the x, y and z.

Q. Addition of conc.

H_{2} S O_{4}

Q. Gypsum is a widely occurring mineral. It is the sulphate of calcium with two molecules of water attached. On heating it loses three-quarters of its water and becomes:

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