Input interpretation
![terbium(III) iodide | molar mass](../image_source/5a1b6964d3030b7a6bf1414670ccf678.png)
terbium(III) iodide | molar mass
Result
![Find the molar mass, M, for terbium(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: TbI_3 Use the chemical formula, TbI_3, to count the number of atoms, N_i, for each element: | N_i I (iodine) | 3 Tb (terbium) | 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 Tb (terbium) | 1 | 158.92535 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 Tb (terbium) | 1 | 158.92535 | 1 × 158.92535 = 158.92535 M = 380.71341 g/mol + 158.92535 g/mol = 539.63876 g/mol](../image_source/12d3be8376dbbc1048295f44b0ebb5b4.png)
Find the molar mass, M, for terbium(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: TbI_3 Use the chemical formula, TbI_3, to count the number of atoms, N_i, for each element: | N_i I (iodine) | 3 Tb (terbium) | 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 Tb (terbium) | 1 | 158.92535 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 Tb (terbium) | 1 | 158.92535 | 1 × 158.92535 = 158.92535 M = 380.71341 g/mol + 158.92535 g/mol = 539.63876 g/mol
Unit conversion
![0.53963876 kg/mol (kilograms per mole)](../image_source/006e273f24e1ffd1d3558581ad75580b.png)
0.53963876 kg/mol (kilograms per mole)
Comparisons
![≈ 0.75 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/a6673e87df79e3ad34a75211a786ede3.png)
≈ 0.75 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 2.8 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/8db5ba78c53ccccca75c5868e3aa653a.png)
≈ 2.8 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 9.2 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/08f5e757f5d1005a623bcde8b36d243e.png)
≈ 9.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 9×10^-22 grams | 9×10^-25 kg (kilograms) | 540 u (unified atomic mass units) | 540 Da (daltons)](../image_source/9c0cea93458c25da0d2a10b5090a6dbf.png)
Mass of a molecule m from m = M/N_A: | 9×10^-22 grams | 9×10^-25 kg (kilograms) | 540 u (unified atomic mass units) | 540 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 540](../image_source/23316d380a74d1b76bd3c8572d510de3.png)
Relative molecular mass M_r from M_r = M_u/M: | 540