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Standard XII

Chemistry

Stoichiometry

A 0.60 g samp...

Question

A $0.60 g$ sample consisting of only $C a C_{2} O_{4}$ and $M g C_{2} O_{4}$ is heated at $500^{o} C,$ converting the two salts of $C a C O_{3}$ and $M g C O_{3} .$ The sample then weighs $0.465 g$ . If the sample had been heated to $900^{o} C$ and the products are $C a O$ and $M g O$ , what would the mixtures of oxides have weighed?

0.12 g

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0.21 g

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0.252 g

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0.3 g

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Solution

The correct option is C $0.252 g$
Let $x g$ is wt. of $C a C_{2} O_{4}$ and $(0.6 - x) g$ wt. of $M g C_{2} O_{4}$
$C a C_{2} O_{4} △ - \to C a C O_{3} + C O_{2}$
$M g C_{2} O_{4} △ - \to M g C O_{3} + C O_{2}$
wt. of $C a C O_{3}$ produced $= \frac{x}{128} \times 100$
wt. of $M g C O_{3}$ produced $= \frac{(0.6 - x)}{112} \times 84$
$∴ \frac{x}{128} \times 100 + \frac{(0.6 - x)}{112} \times 84 = 0.465$
$x = 0.48 g$
Due to further heating,
$C a C O_{3} △ - \to C a O + C O_{2} \frac{x}{128}$
$M g C O_{3} △ - \to M g O + C O_{2}$
$(\frac{0.6 - x}{112})$
Putting the value of $x$ and finding wt. of $C a O$ and $M g O$ produced
$= \frac{0.48}{128} \times 56 + \frac{0.12}{112} \times 40 = 0.252 g$

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Similar questions

Q. A

0.60 g

sample consisting of only

C a C_{2} O_{4}

and

M g C_{2} O_{4}

is heated at

500^{\circ} C

, converting the two salts of

C a C O_{3}

and

M g C O_{3}

. The sample then, weighs

0.465 g

. If the sample had been heated to

900^{\circ} C

, where the products are

C a O

and

M g O

, what would the mixtures of oxides have weighed?

Q. A

0.60 g

sample consisting of only

C a C_{2} O_{4}

and

M g C_{2} O_{4}

is heated at

500^{o} C,

converting the two salts of

C a C O_{3}

and

M g C O_{3} .

The sample then weighs

0.465 g

. If the sample had been heated to

900^{o} C

and the products are

C a O

and

M g O

, what would the mixtures of oxides have weighed?

Q. A

0.60 g

sample consisting of only

C a C_{2} O_{4}

and

M g C_{2} O_{4}

is heated at

500^{o} C

converting the two salts to

C a C O_{3}

and

M g C O_{3}

. The sample then weight

0.465 g

. If the sample had been heated to

900^{o} C

, where the products are

C a O

and

M g O

, what would the mixtures of oxide have weighed (in grams)?
Report your answer upto two decimal only.

Q. A sample containing only

C a C O_{3}

and

M g C O_{3}

is ignited to

C a O

and

M g O

. The mixture of oxides produced weight exactly half as much as the original sample. The mass percentages of

C a C O_{3}

and

M g C O_{3}

in the sample are respectively :

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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Stoichiometry

Standard XII Chemistry

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A 0.60 g sample consisting of only CaC2O4 and MgC2O4 is heated at 500 o C, converting the two salts of CaCO3 and MgCO3. The sample then weighs 0.465 g. If the sample had been heated to 900 o C and the products are CaO and MgO, what would the mixtures of oxides have weighed?