Question

РАССЧИТАЙТЕ ОТНОСИТЕЛЬНУЮ МОЛЕКУЛЯРНУЮ МАССУ ВЕЩЕСТВ Mr(ALPO4)=? Mr(CaSiO3)=? Mr(Na2SO4)=?

Answer 1

Mr(AlPO4)=122  27+31+64=122

Mr(CaSiO3)=116  40+28+48=116

Mr(Na2SO4)=142  46+32+64=142

Answer 2

Calculation of Relative Molecular Mass

To calculate the relative molecular mass (Mr) of a substance, we need to determine the sum of the atomic masses of all the atoms in its chemical formula. Let's calculate the relative molecular masses for the given substances:

1. Mr(ALPO4): - The chemical formula for aluminum phosphate is AlPO4. - The atomic mass of aluminum (Al) is 26.98 g/mol. - The atomic mass of phosphorus (P) is 30.97 g/mol. - The atomic mass of oxygen (O) is 16.00 g/mol. - To calculate the relative molecular mass, we add up the atomic masses of all the atoms in the formula: (1 * Al) + (1 * P) + (4 * O). - Therefore, the relative molecular mass of ALPO4 is (1 * 26.98) + (1 * 30.97) + (4 * 16.00) = 121.94 g/mol. [[1]]

2. Mr(CaSiO3): - The chemical formula for calcium silicate is CaSiO3. - The atomic mass of calcium (Ca) is 40.08 g/mol. - The atomic mass of silicon (Si) is 28.09 g/mol. - The atomic mass of oxygen (O) is 16.00 g/mol. - To calculate the relative molecular mass, we add up the atomic masses of all the atoms in the formula: (1 * Ca) + (1 * Si) + (3 * O). - Therefore, the relative molecular mass of CaSiO3 is (1 * 40.08) + (1 * 28.09) + (3 * 16.00) = 164.16 g/mol. [[2]]

3. Mr(Na2SO4): - The chemical formula for sodium sulfate is Na2SO4. - The atomic mass of sodium (Na) is 22.99 g/mol. - The atomic mass of sulfur (S) is 32.07 g/mol. - The atomic mass of oxygen (O) is 16.00 g/mol. - To calculate the relative molecular mass, we add up the atomic masses of all the atoms in the formula: (2 * Na) + (1 * S) + (4 * O). - Therefore, the relative molecular mass of Na2SO4 is (2 * 22.99) + (1 * 32.07) + (4 * 16.00) = 142.04 g/mol. [[3]]

To summarize: - The relative molecular mass of ALPO4 is 121.94 g/mol. - The relative molecular mass of CaSiO3 is 164.16 g/mol. - The relative molecular mass of Na2SO4 is 142.04 g/mol.

Please note that these calculations are based on the atomic masses of the elements as of the current scientific understanding.