Question

Calculate the number of molecules of Ca0 present in 28gm of Ca0 also calculate number of calcium present in it. ( Mass number, ca=40 , o=16 )​

Answer 1

Explanation:

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Answer 2

Given that

Mass of CaO, W = 2.8g

Moles mass of CaO, M = 56g/moles

Number of mass of CaO, n = W/m = 2.8/56 moles

=0.05moles

Number of molecules, N = n×Na

=0.05×6.022×10^23 = 3.011×10^22 molecules