Input interpretation
![lithium iodide | molar mass](../image_source/4e8d089fc6659e93e087ad1f90697464.png)
lithium iodide | molar mass
Result
![Find the molar mass, M, for lithium 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: LiI Use the chemical formula to count the number of atoms, N_i, for each element: | N_i I (iodine) | 1 Li (lithium) | 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) | 1 | 126.90447 Li (lithium) | 1 | 6.94 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) | 1 | 126.90447 | 1 × 126.90447 = 126.90447 Li (lithium) | 1 | 6.94 | 1 × 6.94 = 6.94 M = 126.90447 g/mol + 6.94 g/mol = 133.84 g/mol](../image_source/010b39fd8c13eab3cd550c3e9a4461a3.png)
Find the molar mass, M, for lithium 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: LiI Use the chemical formula to count the number of atoms, N_i, for each element: | N_i I (iodine) | 1 Li (lithium) | 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) | 1 | 126.90447 Li (lithium) | 1 | 6.94 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) | 1 | 126.90447 | 1 × 126.90447 = 126.90447 Li (lithium) | 1 | 6.94 | 1 × 6.94 = 6.94 M = 126.90447 g/mol + 6.94 g/mol = 133.84 g/mol
Unit conversion
![0.1338 kg/mol (kilograms per mole)](../image_source/1c06b0cd05fe3b84fe48218e3617c334.png)
0.1338 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.19 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/107a335274f03160d0cac9317d6c61a9.png)
≈ ( 0.19 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.69 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/2f9dd62efe7e6f25a84161ef20cc28aa.png)
≈ 0.69 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/180edc396fc9b86f6a10e96c8eca4d86.png)
≈ 2.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.2×10^-22 grams | 2.2×10^-25 kg (kilograms) | 134 u (unified atomic mass units) | 134 Da (daltons)](../image_source/92e7ba1f3f3f4a08d1d2063fd08dcc9f.png)
Mass of a molecule m from m = M/N_A: | 2.2×10^-22 grams | 2.2×10^-25 kg (kilograms) | 134 u (unified atomic mass units) | 134 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 134](../image_source/ccc5811954c45c9a4f4d3913eb3c7d0c.png)
Relative molecular mass M_r from M_r = M_u/M: | 134