Input interpretation
![potassium bifluoride | molar mass](../image_source/15ed5c820e57a40ac75564ded56e6f83.png)
potassium bifluoride | molar mass
Result
![Find the molar mass, M, for potassium bifluoride: 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: KHF_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 2 H (hydrogen) | 1 K (potassium) | 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 H (hydrogen) | 1 | 1.008 K (potassium) | 1 | 39.0983 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 H (hydrogen) | 1 | 1.008 | 1 × 1.008 = 1.008 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 M = 37.996806326 g/mol + 1.008 g/mol + 39.0983 g/mol = 78.103 g/mol](../image_source/ca2b4250634fedbcf4c65d3793f53a2c.png)
Find the molar mass, M, for potassium bifluoride: 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: KHF_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 2 H (hydrogen) | 1 K (potassium) | 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 H (hydrogen) | 1 | 1.008 K (potassium) | 1 | 39.0983 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 H (hydrogen) | 1 | 1.008 | 1 × 1.008 = 1.008 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 M = 37.996806326 g/mol + 1.008 g/mol + 39.0983 g/mol = 78.103 g/mol
Unit conversion
![0.078103 kg/mol (kilograms per mole)](../image_source/5864cc54b001e1fa0378cbd58f04d334.png)
0.078103 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.11 ≈ 1/9 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/7a56ebe952b4e04478913da646b19ae0.png)
≈ ( 0.11 ≈ 1/9 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.4 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/5613d3448576f4e74223ca5f0dc15a95.png)
≈ 0.4 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/79d95ec03c61b571dfa1bb8ebfdd7033.png)
≈ 1.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.3×10^-22 grams | 1.3×10^-25 kg (kilograms) | 78 u (unified atomic mass units) | 78 Da (daltons)](../image_source/6a5226600d4735203f149a6d522e06ee.png)
Mass of a molecule m from m = M/N_A: | 1.3×10^-22 grams | 1.3×10^-25 kg (kilograms) | 78 u (unified atomic mass units) | 78 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 78](../image_source/45524238e97c296afc6f216d6519c14c.png)
Relative molecular mass M_r from M_r = M_u/M: | 78