Input interpretation
![lead metaarsenate | molar mass](../image_source/2a8ea6816534b99c20d6d340950742ba.png)
lead metaarsenate | molar mass
Result
![Find the molar mass, M, for lead metaarsenate: M = sum _iN_im_i Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i and m_i using these items. • Finally, compute the mass. Write the chemical formula: As_2O_6Pb Use the chemical formula, As_2O_6Pb, to count the number of atoms, N_i, for each element: | N_i As (arsenic) | 2 O (oxygen) | 6 Pb (lead) | 1 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) As (arsenic) | 2 | 74.921595 O (oxygen) | 6 | 15.999 Pb (lead) | 1 | 207.2 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) As (arsenic) | 2 | 74.921595 | 2 × 74.921595 = 149.843190 O (oxygen) | 6 | 15.999 | 6 × 15.999 = 95.994 Pb (lead) | 1 | 207.2 | 1 × 207.2 = 207.2 M = 149.843190 g/mol + 95.994 g/mol + 207.2 g/mol = 453.0 g/mol](../image_source/12ef706f7de8b8955a5935827f136ce8.png)
Find the molar mass, M, for lead metaarsenate: M = sum _iN_im_i Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i and m_i using these items. • Finally, compute the mass. Write the chemical formula: As_2O_6Pb Use the chemical formula, As_2O_6Pb, to count the number of atoms, N_i, for each element: | N_i As (arsenic) | 2 O (oxygen) | 6 Pb (lead) | 1 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) As (arsenic) | 2 | 74.921595 O (oxygen) | 6 | 15.999 Pb (lead) | 1 | 207.2 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) As (arsenic) | 2 | 74.921595 | 2 × 74.921595 = 149.843190 O (oxygen) | 6 | 15.999 | 6 × 15.999 = 95.994 Pb (lead) | 1 | 207.2 | 1 × 207.2 = 207.2 M = 149.843190 g/mol + 95.994 g/mol + 207.2 g/mol = 453.0 g/mol
Unit conversion
![0.453 kg/mol (kilograms per mole)](../image_source/db74d6241ec7389379b83561045399a4.png)
0.453 kg/mol (kilograms per mole)
Comparisons
![≈ 0.63 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/ebd1c0da818b4fc7c29ffc195d7e3155.png)
≈ 0.63 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 2.3 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/1b9df99c0544524c0b47ddf37f47a385.png)
≈ 2.3 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 7.8 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/462fd46142776cff808718eba5fa4987.png)
≈ 7.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 7.5×10^-22 grams | 7.5×10^-25 kg (kilograms) | 453 u (unified atomic mass units) | 453 Da (daltons)](../image_source/9e47382cc401f8a11e591f9589a70c27.png)
Mass of a molecule m from m = M/N_A: | 7.5×10^-22 grams | 7.5×10^-25 kg (kilograms) | 453 u (unified atomic mass units) | 453 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 453](../image_source/9bf5abfb672b9a389adf2460c92e9c13.png)
Relative molecular mass M_r from M_r = M_u/M: | 453