1. Tardigrade
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  3. Chemistry
  4. 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 :-

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

NTA AbhyasNTA Abhyas 2022

Solution:

$CaCO _{3( s )} \rightarrow CaO _{( s )}+ CO _{2( g )}$
moles of $CaO =\frac{28}{56}=\frac{1}{2}$
moles of $CaCO _{3}=\frac{ x }{100}$
$\because$ moles of $CaCO _{3}=$ moles of $CaO$
$\frac{ x }{100}=\frac{1}{2} \Rightarrow x =50 gm$