Input interpretation
![ethylene glycol | molar mass](../image_source/7c1b7ad98aefa6c12a08d9e84eea1eb0.png)
ethylene glycol | molar mass
Result
![Find the molar mass, M, for ethylene glycol: 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: HOCH_2CH_2OH Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 6 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) | 6 | 1.008 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) | 6 | 1.008 | 6 × 1.008 = 6.048 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 24.022 g/mol + 6.048 g/mol + 31.998 g/mol = 62.068 g/mol](../image_source/836a4af0c520bc05f676b0b87b189386.png)
Find the molar mass, M, for ethylene glycol: 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: HOCH_2CH_2OH Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 6 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) | 6 | 1.008 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) | 6 | 1.008 | 6 × 1.008 = 6.048 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 24.022 g/mol + 6.048 g/mol + 31.998 g/mol = 62.068 g/mol
Unit conversion
![0.06207 kg/mol (kilograms per mole)](../image_source/53679ec4435f28e54fa9e73a60500f5c.png)
0.06207 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.086 ≈ 1/12 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/805fe306c066b46c8e6c4975b97b7c05.png)
≈ ( 0.086 ≈ 1/12 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.32 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/9d2862bab2f8877b50cc0a1401783c77.png)
≈ 0.32 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.1 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/b657ede41360d31a3b988dd4df775dad.png)
≈ 1.1 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1×10^-22 grams | 1×10^-25 kg (kilograms) | 62 u (unified atomic mass units) | 62 Da (daltons)](../image_source/dc4b57bc818b7c814f31ab3a7ea4c4a7.png)
Mass of a molecule m from m = M/N_A: | 1×10^-22 grams | 1×10^-25 kg (kilograms) | 62 u (unified atomic mass units) | 62 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 62](../image_source/abc6f4be9dbb0b7f8b7000c4fc2fa253.png)
Relative molecular mass M_r from M_r = M_u/M: | 62