Input interpretation
![potassium acetate | molar mass](../image_source/27d1a40c8ae59a1c049e528520927bb8.png)
potassium acetate | molar mass
Result
![Find the molar mass, M, for potassium acetate: 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: CH_3COOK Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 3 K (potassium) | 1 O (oxygen) | 2 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) C (carbon) | 2 | 12.011 H (hydrogen) | 3 | 1.008 K (potassium) | 1 | 39.0983 O (oxygen) | 2 | 15.999 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) C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 H (hydrogen) | 3 | 1.008 | 3 × 1.008 = 3.024 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 24.022 g/mol + 3.024 g/mol + 39.0983 g/mol + 31.998 g/mol = 98.142 g/mol](../image_source/3fcee87040c387c8595a731c50b0dd40.png)
Find the molar mass, M, for potassium acetate: 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: CH_3COOK Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 3 K (potassium) | 1 O (oxygen) | 2 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) C (carbon) | 2 | 12.011 H (hydrogen) | 3 | 1.008 K (potassium) | 1 | 39.0983 O (oxygen) | 2 | 15.999 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) C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 H (hydrogen) | 3 | 1.008 | 3 × 1.008 = 3.024 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 24.022 g/mol + 3.024 g/mol + 39.0983 g/mol + 31.998 g/mol = 98.142 g/mol
Unit conversion
![0.098142 kg/mol (kilograms per mole)](../image_source/693aee235acd5a4ce7e85fdbe8c14d17.png)
0.098142 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.14 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/80c16b5978b2a368b2ba7b483d6196cb.png)
≈ ( 0.14 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.51 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/81d5d13dab55b8638811cf3b8a8f520d.png)
≈ 0.51 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.7 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/b4006785103a322e2ee3912e8e5e2a4a.png)
≈ 1.7 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.6×10^-22 grams | 1.6×10^-25 kg (kilograms) | 98 u (unified atomic mass units) | 98 Da (daltons)](../image_source/429e9334dd0411ed7cb99eb112299978.png)
Mass of a molecule m from m = M/N_A: | 1.6×10^-22 grams | 1.6×10^-25 kg (kilograms) | 98 u (unified atomic mass units) | 98 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 98](../image_source/ef8c65e2248fe9eb8f118529072bff7f.png)
Relative molecular mass M_r from M_r = M_u/M: | 98