x gram of CaCO3 was completely decomposed on heating. The mass of the solid residue formed is 28gm . What is the value of ' x ' in gram :-

Question

x gram of CaCO3 was completely decomposed on heating. The mass of the solid residue formed is 28gm . What is the value of ' x ' in gram :- (A) 44 (B) 200 (C) 150 (D) 50

Tardigrade Admin · Accepted Answer

CaCO 3( s ) arrow CaO ( s )+ CO 2( g ) moles of CaO =(28/56)=(1/2) moles of CaCO 3=( x /100) ∵ moles of CaCO 3= moles of CaO ( x /100)=(1/2) ⇒ x =50 gm

Q. $x$ gram of $C a C O_{3}$ was completely decomposed on heating. The mass of the solid residue formed is $28 g m$ . What is the value of ' $x$ ' in gram :-

$44$

$200$

$150$

$50$

$C a C O_{3 (s)} \to C a O_{(s)} + C O_{2 (g)}$
moles of $C a O = \frac{28}{56} = \frac{1}{2}$
moles of $C a C O_{3} = \frac{x}{100}$
$∵$ moles of $C a C O_{3} =$ moles of $C a O$
$\frac{x}{100} = \frac{1}{2} \Rightarrow x = 50 g m$

Q. x gram of CaCO3​ was completely decomposed on heating. The mass of the solid residue formed is 28gm . What is the value of ' x ' in gram :-

44

200

150

50