Chapter 7: Problem 46

What is the molar mass of the phosphate ion, \(\mathrm{PO}_{4}^{3-} ?\)

Short Answer

Expert verified

The molar mass of the phosphate ion, \(\mathrm{PO}_{4}^{3-}\), is approximately 94.97 g/mol.

Step by step solution

Identify the masses of individual elements

From the periodic table, refer to the molar masses of individual elements. The molar mass of Phosphorus (P) is approximately 30.97 g/mol and that of Oxygen (O) is approximately 16 g/mol.

Calculate the molar mass of the phosphate ion

The formula of the phosphate ion is \(\mathrm{PO}_{4}^{3-}\), which means it consists of 1 atom of Phosphorus and 4 atoms of Oxygen. Multiply the molar mass of Oxygen by 4 (since there are 4 Oxygen atoms in phosphate), then add the molar mass of Phosphorus. This equals the molar mass of the phosphate ion. Mathematically: molar mass of \(\mathrm{PO}_{4}^{3-} = 1* \(Molar mass of P) + 4 * \(Molar mass of O)

Substitute values and find the molar mass

Substitute the molar mass of P as 30.97 g/mol and the molar mass of O as 16 g/mol in the above equation to find the molar mass of Phosphate. That is: molar mass of \(\mathrm{PO}_{4}^{3-} = 1 * 30.97 + 4 * 16 g/mol = 94.97 g/mol.

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What is the molar mass of the phosphate ion, \(\mathrm{PO}_{4}^{3-} ?\)

Short Answer

Step by step solution

Identify the masses of individual elements

Calculate the molar mass of the phosphate ion

Substitute values and find the molar mass

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