20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (At. wt. of Mg = 24) [2015]

STUDY MATERIALS
COURSES
MORE
SUCCESS STORY
ADMISSION
STORE

Back

JEE ADVANCE

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

JEE MAIN

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

NEET

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

BITSAT

CLASS XI - XII

CLASS XI - XII

CBSE BOARD

CLASS IX

CLASS X

CLASS XI

CLASS XII

CLASS VI

CLASS VII

CLASS VIII

UP BOARD

CLASS IX
CLASS X
CLASS XI
CLASS XII

CLASS IX

CLASS X

CLASS XI

CLASS XII

CUET

CRASH COURSE

CRASH COURSE

Courses

CLASSROOM COURSES
ONLINE COURSES

ONLINE COURSES

More

Solution

Q.
20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample
(At. wt. of Mg = 24) [2015]

1 96

2 60

3 84

4 75

Ans.
(3)

$\underset{84 g}{{MgCO}_{3 (s)}} \overset{Δ}{\to} \underset{40 g}{{MgO}_{(s)}} + {CO}_{2 (g)}$

84 g of $M g C O_{3} \equiv$ 40 g of MgO

$∴$ ${20 g of MgCO}_{3} \equiv \frac{40}{84} \times 20 = 9.52 g of MgO$

Actual yield = 8 g of MgO

$∴$ $% purity = \frac{8}{9.52} \times 100 = 84 %$

Want Us to Email you About Special Offers & Updates?