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26 June, 15:42

What is the total number of moles represented by 20 grams of CACO3

A. 0.1

B. 0.2

C. 1

D. 2

+3
Answers (1)
  1. 26 June, 16:29
    0
    B. 0.2.

    Explanation:

    We can use the relation:

    n = mass/molar mass

    mass of CaCO₃ = 20 g, molar mass of CaCO₃ = 100.0869 g/mol.

    ∴ n = mass/molar mass = (20 g) / (100.0869 g/mol) = 0.1998 ≅ 0.2 mol.

    So, the right choice is: B. 0.2.
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