дано

m(CaCO3) = 1 kg = 1000 g

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N(CaCO3)-?

M(CaCO3) = 100 g/mol

N(A)  = 6.02*10^23

n(O3) = 3at

N(O3) = m(CaCO3) / M(CaCO3) * N(A) * n

N(O3) = 1000 / 100 * 6.02*10^23 * 3 = 180.6*10^23 at

ответ 180.6*10^23 атомов