Question

which among the following contains highest number of atoms
a. 8 g of O2
b. 9 g of H2O
c. 25 g of CaCO3
d. 10 g of He

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Answer 1

Answer:

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Explanation:

(A)THE MOLAR MASS OF O2 = 32G

SO 8 GRAM = 0.25MOLE OF O2

SO NUMBER OF ATOMS = 2 × 0.25 × 6.022×10^23

(B) MOLAR MASS OF H2O= 18G

SO 9 GRAM OF H20 = 0.5MOLE OF H20

SO NUMBER OF ATOMS OF H20= 3 × 0.5 ×6.022×10^23

(C) MOLAR MASS OF CACO3 = 100G

SO 25 G OF CACO3 = 0.4 MOLE OF CACO3

SO NUMBER OF ATOM OF CACO3 = 0.4× 5 ×10^23

(D) MOLAR MASS OF He = 4 G

10 G OF He = 2.5MOLE OF He

NUMBER OF ATOMS OF HELIUM = 2.5 ×1 × 6.022×10^23 .

ON COMPARING WE GET HELIUM JAS THE MOST ATOMS IN THIS CASE SO OPTION (D) 10 G OF He IS CORRECT.

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