Input interpretation
![rhenium(VI) dioxydifluoride | molar mass](../image_source/2d091134542371068686acfc9d0e8896.png)
rhenium(VI) dioxydifluoride | molar mass
Result
![Find the molar mass, M, for rhenium(VI) dioxydifluoride: 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: ReO_2F_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 2 O (oxygen) | 2 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) | 2 | 18.998403163 O (oxygen) | 2 | 15.999 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) | 2 | 18.998403163 | 2 × 18.998403163 = 37.996806326 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 Re (rhenium) | 1 | 186.207 | 1 × 186.207 = 186.207 M = 37.996806326 g/mol + 31.998 g/mol + 186.207 g/mol = 256.202 g/mol](../image_source/9c25286eaf215908b9c6958ef66b5c19.png)
Find the molar mass, M, for rhenium(VI) dioxydifluoride: 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: ReO_2F_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 2 O (oxygen) | 2 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) | 2 | 18.998403163 O (oxygen) | 2 | 15.999 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) | 2 | 18.998403163 | 2 × 18.998403163 = 37.996806326 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 Re (rhenium) | 1 | 186.207 | 1 × 186.207 = 186.207 M = 37.996806326 g/mol + 31.998 g/mol + 186.207 g/mol = 256.202 g/mol
Unit conversion
![0.256202 kg/mol (kilograms per mole)](../image_source/214a95aecd20d2a4ad6a18c30b4df500.png)
0.256202 kg/mol (kilograms per mole)
Comparisons
![≈ 0.36 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/810fe6e1910d7d3882b5ff5870370cc2.png)
≈ 0.36 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/4672b797b987a16eab9fec045247be86.png)
≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 4.4 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/1510438b1cf103b4c7a3f2ee29c71654.png)
≈ 4.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 4.3×10^-22 grams | 4.3×10^-25 kg (kilograms) | 256 u (unified atomic mass units) | 256 Da (daltons)](../image_source/d9e9dcacab8749fd22c9bc0a3b33d562.png)
Mass of a molecule m from m = M/N_A: | 4.3×10^-22 grams | 4.3×10^-25 kg (kilograms) | 256 u (unified atomic mass units) | 256 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 256](../image_source/fa37d7cc712a2ab0da9e30272b1c3fc4.png)
Relative molecular mass M_r from M_r = M_u/M: | 256