You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Uses of Slaked Lime

A sample cont...

Question

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 :

28.4

71.6

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

71.6

28.4

No worries! We‘ve got your back. Try BYJU‘S free classes today!

56.7

43.3

No worries! We‘ve got your back. Try BYJU‘S free classes today!

78.5

21.5

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D $28.4$ %, $71.6$ %
The molar masses of calcium carbonate, magnesium carbonate, calcium oxide and magnesium oxide are $100$ g/mol, $84.3$ g/mol, $56$ g/mol and $40.3$ g/mol respectively.
Let $100$ g of original sample contains $x$ g of calcium carbonate and $100 - x$ g of magnesium carbonate respectively.
The amounts of calcium oxide and magnesium oxide obtained on the decomposition will be $0.56 x$ g and $0.478 (100 - x)$ g respectively.
Hence, $x + 100 - x = 2 (0.56 x + 0.478 (100 - x))$ .
Hence, $x = 28.4$ and $100 - x = 71.6$

Suggest Corrections

Similar questions

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

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 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

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 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?

Join BYJU'S Learning Program

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. The mass percentages of CaCO3 and MgCO3 in the sample are respectively :

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 :