x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of x (in grams)?

Question

x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of x (in grams)? (A) 44 (B) 200 (C) 150 (D) 50

Tardigrade Admin · Accepted Answer

CaCO 3(s) xrightarrowΔ CaO (s)+ CO 2(g) 40+12+48 40+16 =100 =56 ∴ 56 g CaO is obtained from =100 g . CaCO 3 ∴ 28 g CaO is obtained from =(100 × 28/56) =50 g . CaCO 3

Q. $x$ grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is $28 g$ . What is the value of $x$ (in grams)?

44

200

150

50

$C a C O_{3} (s) Δ C a O (s) + C O_{2} (g)$
$40 + 12 + 4840 + 16$
$= 100 = 56$
$∴ 56 g C a O$ is obtained from
$= 100 g . C a C O_{3}$
$∴ 28 g C a O$ is obtained from
$= \frac{100 \times 28}{56}$
$= 50 g . C a C O_{3}$

Q. x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28g. What is the value of x (in grams)?

44

200

150

50

CaCO3​(s)Δ​CaO(s)+CO2​(g) 40+12+4840+16 =100=56 ∴56gCaO is obtained from =100g.CaCO3​ ∴28gCaO is obtained from =56100×28​ =50g.CaCO3​

Q. $x$ grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is $28 g$ . What is the value of $x$ (in grams)?

$C a C O_{3} (s) Δ C a O (s) + C O_{2} (g)$
$40 + 12 + 4840 + 16$
$= 100 = 56$
$∴ 56 g C a O$ is obtained from
$= 100 g . C a C O_{3}$
$∴ 28 g C a O$ is obtained from
$= \frac{100 \times 28}{56}$
$= 50 g . C a C O_{3}$