Input interpretation
![selenium tetrafluoride | molar mass](../image_source/ede701ad2fd079cd86a5873ebaf154ff.png)
selenium tetrafluoride | molar mass
Result
![Find the molar mass, M, for selenium tetrafluoride: 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_4Se Use the chemical formula, F_4Se, to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 4 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) | 4 | 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) | 4 | 18.998403163 | 4 × 18.998403163 = 75.993612652 Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 M = 75.993612652 g/mol + 78.971 g/mol = 154.965 g/mol](../image_source/9b7021e35c6291899be42c2767ab0c7c.png)
Find the molar mass, M, for selenium tetrafluoride: 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_4Se Use the chemical formula, F_4Se, to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 4 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) | 4 | 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) | 4 | 18.998403163 | 4 × 18.998403163 = 75.993612652 Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 M = 75.993612652 g/mol + 78.971 g/mol = 154.965 g/mol
Unit conversion
![0.15496 kg/mol (kilograms per mole)](../image_source/af0e2d2af0c84bc36a8c3fa4ce7808ba.png)
0.15496 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.22 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/c8cf16f6f18b964c926652de9cf9b3bc.png)
≈ ( 0.22 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.8 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/c7fb8a7605457046717302b519502148.png)
≈ 0.8 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.7 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/82caf82dc20321ec26cecf9f54751952.png)
≈ 2.7 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.6×10^-22 grams | 2.6×10^-25 kg (kilograms) | 155 u (unified atomic mass units) | 155 Da (daltons)](../image_source/ef25c839829285aad4a31edd2d0c3703.png)
Mass of a molecule m from m = M/N_A: | 2.6×10^-22 grams | 2.6×10^-25 kg (kilograms) | 155 u (unified atomic mass units) | 155 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 155](../image_source/63e3049317ecb60d9f7d35d64b4b7a9b.png)
Relative molecular mass M_r from M_r = M_u/M: | 155