Question

Вычислить относительные молекулярные массы CaCl2, H2O, Al(ОН)3, Mg(NO3)2

Answer 1

Ответ:

CaCl2 - 110

H2O - 18

Al(OH)3 - 78

Mg(NO3)2 - 148

Объяснение:

просто складываем атомные массы элементов, если есть индексы (циферки) умножаем атомную массу на индекс, в последних двух умножаем атомные массы элементов в скобках на индекс после скобок и складываем всё

Answer 2

Calculation of Relative Molecular Masses

To calculate the relative molecular masses of the given compounds, we need to consider the atomic masses of the elements present in each compound. Here are the calculations for each compound:

1. CaCl2 (Calcium Chloride): - Atomic mass of Ca (Calcium) = 40.08 g/mol - Atomic mass of Cl (Chlorine) = 35.45 g/mol - Relative molecular mass of CaCl2 = (1 * Ca) + (2 * Cl) = (1 * 40.08) + (2 * 35.45) = 110.98 g/mol

2. H2O (Water): - Atomic mass of H (Hydrogen) = 1.01 g/mol - Atomic mass of O (Oxygen) = 16.00 g/mol - Relative molecular mass of H2O = (2 * H) + (1 * O) = (2 * 1.01) + (1 * 16.00) = 18.02 g/mol

3. Al(OH)3 (Aluminum Hydroxide): - Atomic mass of Al (Aluminum) = 26.98 g/mol - Atomic mass of O (Oxygen) = 16.00 g/mol - Atomic mass of H (Hydrogen) = 1.01 g/mol - Relative molecular mass of Al(OH)3 = (1 * Al) + (3 * O) + (3 * H) = (1 * 26.98) + (3 * 16.00) + (3 * 1.01) = 78.00 g/mol

4. Mg(NO3)2 (Magnesium Nitrate): - Atomic mass of Mg (Magnesium) = 24.31 g/mol - Atomic mass of N (Nitrogen) = 14.01 g/mol - Atomic mass of O (Oxygen) = 16.00 g/mol - Relative molecular mass of Mg(NO3)2 = (1 * Mg) + (2 * N) + (6 * O) = (1 * 24.31) + (2 * 14.01) + (6 * 16.00) = 148.32 g/mol

Therefore, the relative molecular masses of the given compounds are as follows:

- CaCl2: 110.98 g/mol - H2O: 18.02 g/mol - Al(OH)3: 78.00 g/mol - Mg(NO3)2: 148.32 g/mol