The mass fraction of calcium in the substance forming chalk limestone marble is equal to ..

univerkov | September 16, 2021 | education

Chalk, limestone and marble have the chemical formula CaCO3. The mass fraction is calculated by the formula: u = A * n / M. Here A is the relative atomic mass of the element (according to Mendeleev’s table), n is the amount of the element in the formula (index), M is the relative molecular weight of the substance (according to Mendeleev’s table) … A (Ca) = 40. M (CaCO3) = 40 + 12 + 16 * 3 = 100. Find the mass fraction u (Ca) = 40 * 1/100 = 0.4. Or as a percentage of 40%.

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