Question

Вариант 1 Рассчитайте относительные молекулярные массы веществ: Li,CO3, РО.​

Answer 1

Mr(Li) = 7 г/моль

Mr(CO3) = 60 г/моль

Mr(PO) = 47 г/моль

Answer 2

Calculation of Relative Molecular Masses

To calculate the relative molecular masses of the substances you mentioned, we need to consider the atomic masses of the elements present in each compound.

1. Lithium (Li): - The atomic mass of lithium is approximately 6.94 atomic mass units (amu).

2. Carbonate (CO3): - The atomic mass of carbon is approximately 12.01 amu. - The atomic mass of oxygen is approximately 16.00 amu. - Since there are three oxygen atoms in a carbonate ion, we multiply the atomic mass of oxygen by 3.

3. Phosphate (PO): - The atomic mass of phosphorus is approximately 30.97 amu. - The atomic mass of oxygen is approximately 16.00 amu. - Since there are four oxygen atoms in a phosphate ion, we multiply the atomic mass of oxygen by 4.

Now, let's calculate the relative molecular masses:

1. Lithium (Li): - The relative molecular mass of lithium (Li) is equal to its atomic mass, which is approximately 6.94 amu.

2. Carbonate (CO3): - The relative molecular mass of carbonate (CO3) can be calculated by adding the atomic masses of carbon and oxygen: - Carbon: 12.01 amu - Oxygen (3 atoms): 16.00 amu * 3 = 48.00 amu - The total relative molecular mass of carbonate (CO3) is approximately 12.01 amu + 48.00 amu = 60.01 amu.

3. Phosphate (PO): - The relative molecular mass of phosphate (PO) can be calculated by adding the atomic masses of phosphorus and oxygen: - Phosphorus: 30.97 amu - Oxygen (4 atoms): 16.00 amu * 4 = 64.00 amu - The total relative molecular mass of phosphate (PO) is approximately 30.97 amu + 64.00 amu = 94.97 amu.

To summarize: - The relative molecular mass of lithium (Li) is approximately 6.94 amu. - The relative molecular mass of carbonate (CO3) is approximately 60.01 amu. - The relative molecular mass of phosphate (PO) is approximately 94.97 amu.

Please note that these values are approximate and may vary slightly depending on the source and the isotopic composition of the elements.

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