Input interpretation
![rhodium(III) iodide | molar mass](../image_source/b4b25a83d88f0709eeaeaed17d54de17.png)
rhodium(III) iodide | molar mass
Result
![Find the molar mass, M, for rhodium(III) iodide: 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: I_3Rh Use the chemical formula to count the number of atoms, N_i, for each element: | N_i I (iodine) | 3 Rh (rhodium) | 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) I (iodine) | 3 | 126.90447 Rh (rhodium) | 1 | 102.90550 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) I (iodine) | 3 | 126.90447 | 3 × 126.90447 = 380.71341 Rh (rhodium) | 1 | 102.90550 | 1 × 102.90550 = 102.90550 M = 380.71341 g/mol + 102.90550 g/mol = 483.61891 g/mol](../image_source/c83f41762623b4adec547b73ad5168cf.png)
Find the molar mass, M, for rhodium(III) iodide: 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: I_3Rh Use the chemical formula to count the number of atoms, N_i, for each element: | N_i I (iodine) | 3 Rh (rhodium) | 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) I (iodine) | 3 | 126.90447 Rh (rhodium) | 1 | 102.90550 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) I (iodine) | 3 | 126.90447 | 3 × 126.90447 = 380.71341 Rh (rhodium) | 1 | 102.90550 | 1 × 102.90550 = 102.90550 M = 380.71341 g/mol + 102.90550 g/mol = 483.61891 g/mol
Unit conversion
![0.48361891 kg/mol (kilograms per mole)](../image_source/c24d16089af84a46eed35a07f67ac715.png)
0.48361891 kg/mol (kilograms per mole)
Comparisons
![≈ 0.67 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/8e68e67bfd41e83da8bb90947bce06a3.png)
≈ 0.67 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 2.5 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/26423d565c65a9d42be259c4426fd325.png)
≈ 2.5 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 8.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/e0d0d115c488a37f04ad47f2a95bfe3f.png)
≈ 8.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 8×10^-22 grams | 8×10^-25 kg (kilograms) | 484 u (unified atomic mass units) | 484 Da (daltons)](../image_source/4a0e06eef89851d99f812edac647ba66.png)
Mass of a molecule m from m = M/N_A: | 8×10^-22 grams | 8×10^-25 kg (kilograms) | 484 u (unified atomic mass units) | 484 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 484](../image_source/95365aff1a99f3786734c0ef048a807a.png)
Relative molecular mass M_r from M_r = M_u/M: | 484