100 g sample of dolomite (containing 19% H 2 O , 40% CaCO 3 . MgCO 3 , and inert impurities, as rest) is partially dried so as to contain 10% H 2 O Which of the following is/are correct statem

Question

100 g sample of dolomite (containing 19% H 2 ​ O , 40% CaCO 3 ​ . MgCO 3 ​ , and inert impurities, as rest) is partially dried so as to contain 10% H 2 ​ O Which of the following is/are correct statements (s) ?

TestHub · Accepted Answer

Initial 100 g dolomite:

H₂O = 19 g, CaCO₃·MgCO₃ = 40 g, impurity = 41 g

After drying, water = 10%. Let the final mass be $x$ .

Solids = 81 g, so:

$0.9 x = 81 \Rightarrow x = 90 g$

Water evaporated = $19 - 9 = 10 g$ (D)

Ca in CaCO₃·MgCO₃:

Molar mass = 184, Ca = 40

$40 g co m p o u n d \to \frac{40}{184} \times 40 = 8.7 g$

(B)

Impurity percentage:

$\frac{41}{90} \times 100 = 45.6%$

(C)

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