Input interpretation
![rhenium(VI) fluoride | molar mass](../image_source/705592fddd4b4a3e661144d3669fa16e.png)
rhenium(VI) fluoride | molar mass
Result
![Find the molar mass, M, for rhenium(VI) fluoride: 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: ReF_6 Use the chemical formula, ReF_6, to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 6 Re (rhenium) | 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) F (fluorine) | 6 | 18.998403163 Re (rhenium) | 1 | 186.207 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) F (fluorine) | 6 | 18.998403163 | 6 × 18.998403163 = 113.990418978 Re (rhenium) | 1 | 186.207 | 1 × 186.207 = 186.207 M = 113.990418978 g/mol + 186.207 g/mol = 300.197 g/mol](../image_source/44587909e183d1150e4ec8adeced96bc.png)
Find the molar mass, M, for rhenium(VI) fluoride: 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: ReF_6 Use the chemical formula, ReF_6, to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 6 Re (rhenium) | 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) F (fluorine) | 6 | 18.998403163 Re (rhenium) | 1 | 186.207 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) F (fluorine) | 6 | 18.998403163 | 6 × 18.998403163 = 113.990418978 Re (rhenium) | 1 | 186.207 | 1 × 186.207 = 186.207 M = 113.990418978 g/mol + 186.207 g/mol = 300.197 g/mol
Unit conversion
![0.300197 kg/mol (kilograms per mole)](../image_source/3951d8b51024ec15af196f3ea50996cd.png)
0.300197 kg/mol (kilograms per mole)
Comparisons
![≈ 0.42 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/824d85b79e8fda8a25e4514bab675de8.png)
≈ 0.42 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.5 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/bfb8a395ca11eab14b363659a96004ca.png)
≈ 1.5 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 5.1 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/c8b78fdf21df533c2c5a9b5cb05b6894.png)
≈ 5.1 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 5×10^-22 grams | 5×10^-25 kg (kilograms) | 300 u (unified atomic mass units) | 300 Da (daltons)](../image_source/7b2cd3fc8953171cf750fc509314e7f5.png)
Mass of a molecule m from m = M/N_A: | 5×10^-22 grams | 5×10^-25 kg (kilograms) | 300 u (unified atomic mass units) | 300 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 300](../image_source/693541176dcf7965f9263d17d5c92c5e.png)
Relative molecular mass M_r from M_r = M_u/M: | 300