Input interpretation
![acetic acid | molecular mass](../image_source/41f92f1ad1f5b0e908fa634ee9e76e56.png)
acetic acid | molecular mass
Result
![Find the molecular mass, m, for acetic acid: 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_3CO_2H Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 4 O (oxygen) | 2 Look up the atomic mass, m_i, in unified atomic mass units, u, for each element in the periodic table: | N_i | m_i/u C (carbon) | 2 | 12.011 H (hydrogen) | 4 | 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 molecular mass, m: Answer: | | | N_i | m_i/u | mass/u C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 H (hydrogen) | 4 | 1.008 | 4 × 1.008 = 4.032 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 m = 24.022 u + 4.032 u + 31.998 u = 60.052 u](../image_source/8a35e047b58e8c1d662101650613f48d.png)
Find the molecular mass, m, for acetic acid: 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_3CO_2H Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 4 O (oxygen) | 2 Look up the atomic mass, m_i, in unified atomic mass units, u, for each element in the periodic table: | N_i | m_i/u C (carbon) | 2 | 12.011 H (hydrogen) | 4 | 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 molecular mass, m: Answer: | | | N_i | m_i/u | mass/u C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 H (hydrogen) | 4 | 1.008 | 4 × 1.008 = 4.032 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 m = 24.022 u + 4.032 u + 31.998 u = 60.052 u
Unit conversions
![60.052 Da (daltons)](../image_source/946fff7d736dbf40b1c9cbfd62668815.png)
60.052 Da (daltons)
![0.060052 kDa (kilodaltons)](../image_source/037536734d26a4b4fa48a1c78157f02f.png)
0.060052 kDa (kilodaltons)
![9.972×10^-23 grams](../image_source/a6339d38413119439703896e51ad5221.png)
9.972×10^-23 grams
![9.972×10^-26 kg (kilograms)](../image_source/efbe0fc24346263430c0bb9ceae24819.png)
9.972×10^-26 kg (kilograms)
![60.055 chemical atomic mass units (unit officially deprecated)](../image_source/d6a142a54351b764b302496812195d86.png)
60.055 chemical atomic mass units (unit officially deprecated)
![60.071 physical atomic mass units (unit officially deprecated)](../image_source/5a3a34384ce06eca665246e1422bcbc4.png)
60.071 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ ( 0.083 ≈ 1/12 ) × molecular mass of fullerene ( ≈ 721 u )](../image_source/9f9d9ec76634cf36b344590394d9d537.png)
≈ ( 0.083 ≈ 1/12 ) × molecular mass of fullerene ( ≈ 721 u )
![≈ 0.31 × molecular mass of caffeine ( ≈ 194 u )](../image_source/49d2c3aaf8eb53a06884be096cecd7a9.png)
≈ 0.31 × molecular mass of caffeine ( ≈ 194 u )
![≈ molecular mass of sodium chloride ( ≈ 58 u )](../image_source/07470d52d1527db752f4254b3e8776a7.png)
≈ molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 60](../image_source/e720a5f502fe52ec845594467c2f9c57.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 60
![Molar mass M from M = m_aN_A: | 60 g/mol (grams per mole)](../image_source/b13e7bdf2de552fda14f515768748284.png)
Molar mass M from M = m_aN_A: | 60 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 60](../image_source/3a321183472debc0f57b259a81e1fba5.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 60
![Molar mass M from M = m_mN_A: | 60 g/mol (grams per mole)](../image_source/1399df87ac8959a5b50fc04b055effbe.png)
Molar mass M from M = m_mN_A: | 60 g/mol (grams per mole)