Home
Class 12
CHEMISTRY
A 2.0 g of mixture of Na(2)CO(3) and NaH...

A `2.0 g` of mixture of `Na_(2)CO_(3)` and `NaHCO_(3)` loses `0.248 g` when heated to `300^(@)C`, the temperature at which `NaHCO_(3)` decomposes to `Na_(2)CO_(3)`, `CO_(2)` and `H_(2) O`. What is the percentage of `Na_(2) CO_(3)` in mixture?

A

62.4%

B

64.4%

C

66.4%

D

68.4%

Text Solution

Verified by Experts

The correct Answer is:
C
The loss in weight is due to removal of `CO_(2) " and " H_(2)O` which escape out on heating.
Wt. of `Na_(2)CO_(3)` in the product ` = 2.00 - 0.248 = 1.752 `g
Let wt. `NaHCO_(3) = (2.00 -x) g`
Since `Na_(2)CO(3)` in the products contains x g of unchanged reactant `Na_(2)CO_(3) ` and rest produced from `NaHCO_(3)`.
The wt. of `Na_(2)CO_(3)` produced by `NaHCO_(3) = (1.752 - x)`
`underset((2.0 -x)) (NaHCO_(3)) to underset((1.752 -x))(Na_(2)CO_(3) + )(H_(2)O + CO_(2))uparrow `
Appiying POAC for Na atom.
` 1 xx ` moies of `NaHCO_(3) = 2 xx ` moies of `Na_(2)CO_(3) rArr ((2 -x))/84 = 2 xx ((1 .752 -x))/106`
` :. x = 1.328 `g
` :. % " of " Na_(2)CO_(3) = (1.328)/2 xx 100 = 66.4%`
Promotional Banner

Topper's Solved these Questions

  • STOICHIOMETRY AND BALANCING REDOX REACTION

    FIITJEE|Exercise SOLVED PROBLEMS (SUBJECTIVE )|16 Videos

  • STOICHIOMETRY AND BALANCING REDOX REACTION

    FIITJEE|Exercise SOLVED PROBLEMS (OBJECTIVE )|25 Videos

  • SOLID STATE

    FIITJEE|Exercise (SINGLE INTEGER ANSWER TYPE QUESTION)|5 Videos

  • TEST PAPERS

    FIITJEE|Exercise CHEMISTRY|747 Videos

Similar Questions

Explore conceptually related problems

A 2.0 g of mixture of Na_(2)CO_(3) and NaHCO_(3) loses 0.248 g when heated to 300^(@)C , the temperature at which NaHCO_(3) decomposes to Na_(2)CO_(3) , CO_(2) , the temperature at which NaHCO_(3) decomposes to Na_(2) CO_(3), CO_(3) and H_(2) O . What is the percentage of Na_(2) CO_(3) in mixture?

Does Na_(2)CO_(3) decompose on heating?

10 g mixture of NaHCO_(3) and Na_(2)CO_(3) has 1.68 g NaHCO_(3) . It is heated at 400 K . Weight of the residue will be

When a mixture of Li_(2)CO_(3) and Na_(2)CO_(3) . 10H_(2)O is heated strongly, there occurs a loss of mass due to

20 g mixture of Na_(2)CO_(3) and CaCO_(3) is gently heated. On heating this sample produces 2.24 litre of CO_(2) at STP. Calculate the % weight of Na_(2)CO_(3) in that sample.

How are 0.50 m Na_(2)CO_(3) and 0.50 M Na_(2)CO_(3) different ?