Question

1 mole of a compound contains 1 mole of Ca, 1 moles of C and 3 moles of O. Then the molecular weight of the compound is

(A) 50

(B) 100

(C) 30

(D) 44​

Answer 1

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1 mole of a compound contains 1 mole of Ca, 1 moles of C and 3 moles of O. Then the molecular weight of the compound is

(A) 50

(B) 100

(C) 30

(D) 44 ✔

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(D) 44

Given that:

1 mole of compound contains 1 mole of C and 2 moles of O.

Therefore, the molecular formula of the compound is CO2.

→ Molecular Formula of the compound = CO2

Molecular weight of the compound = 1 x 12 (Molecular weight of the carbon) +2 x 16 (Molecular weight )of the oxygen) = 12 + 32 = 44

Molecular weight of the compound = 44g

Molecular Formula of the compound =

CO2

Molecular weight of the compound = 1 x 12(Molecular weight of the carbon) +2 x 16 (Molecular weight) of the oxygen)

12+32 = 44

Molecular weight of the compound= 44g

..Molecular weight of 1 mole of the compound= 448

Hence the correct option is D.

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