Input interpretation
![selenium hexafluoride | molar mass](../image_source/bf119ec31a2565a4c101d32c63d3239b.png)
selenium hexafluoride | molar mass
Result
![Find the molar mass, M, for selenium hexafluoride: 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: F_6Se Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 6 Se (selenium) | 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 Se (selenium) | 1 | 78.971 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 Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 M = 113.990418978 g/mol + 78.971 g/mol = 192.961 g/mol](../image_source/f5826905a59d8f7eaa8d48d3639aa51c.png)
Find the molar mass, M, for selenium hexafluoride: 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: F_6Se Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 6 Se (selenium) | 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 Se (selenium) | 1 | 78.971 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 Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 M = 113.990418978 g/mol + 78.971 g/mol = 192.961 g/mol
Unit conversion
![0.19296 kg/mol (kilograms per mole)](../image_source/9d07ea6bd72d52c30ad8c713dc65d7de.png)
0.19296 kg/mol (kilograms per mole)
Comparisons
![≈ 0.27 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/a4e75d02e5e910201ed4ce27fa2dd1df.png)
≈ 0.27 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.994 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/ba00d43500feb2d9e0c40e172b706b34.png)
≈ 0.994 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 3.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/1d600e8e42a6de352bca9118cd896e9d.png)
≈ 3.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.2×10^-22 grams | 3.2×10^-25 kg (kilograms) | 193 u (unified atomic mass units) | 193 Da (daltons)](../image_source/22d7cf4d1d48215ceeb276cddfcbf9e1.png)
Mass of a molecule m from m = M/N_A: | 3.2×10^-22 grams | 3.2×10^-25 kg (kilograms) | 193 u (unified atomic mass units) | 193 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 193](../image_source/754b2331e62bf668374208881e920e7d.png)
Relative molecular mass M_r from M_r = M_u/M: | 193