Input interpretation
![acetone | molecular mass](../image_source/7a39f1ab63e096b309ed25b59a82af89.png)
acetone | molecular mass
Result
![Find the molecular mass, m, for acetone: 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_3COCH_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 3 H (hydrogen) | 6 O (oxygen) | 1 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) | 3 | 12.011 H (hydrogen) | 6 | 1.008 O (oxygen) | 1 | 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) | 3 | 12.011 | 3 × 12.011 = 36.033 H (hydrogen) | 6 | 1.008 | 6 × 1.008 = 6.048 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 m = 36.033 u + 6.048 u + 15.999 u = 58.080 u](../image_source/ef85962cb6ddd6639ed434f60988cc1d.png)
Find the molecular mass, m, for acetone: 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_3COCH_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 3 H (hydrogen) | 6 O (oxygen) | 1 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) | 3 | 12.011 H (hydrogen) | 6 | 1.008 O (oxygen) | 1 | 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) | 3 | 12.011 | 3 × 12.011 = 36.033 H (hydrogen) | 6 | 1.008 | 6 × 1.008 = 6.048 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 m = 36.033 u + 6.048 u + 15.999 u = 58.080 u
Unit conversions
![58.08 Da (daltons)](../image_source/3d846de3950fb7d804cebaa87917a03e.png)
58.08 Da (daltons)
![0.05808 kDa (kilodaltons)](../image_source/51846209babc5dbd6a2dbd9bad1ada70.png)
0.05808 kDa (kilodaltons)
![9.644×10^-23 grams](../image_source/ef99fa9a1447f86a9781426a7f0b66b7.png)
9.644×10^-23 grams
![9.644×10^-26 kg (kilograms)](../image_source/ce9c0e14ba5ed86e6f76b58efb36c770.png)
9.644×10^-26 kg (kilograms)
![58.08 chemical atomic mass units (unit officially deprecated)](../image_source/78765581e7bf3e6a995775e85f122263.png)
58.08 chemical atomic mass units (unit officially deprecated)
![58.1 physical atomic mass units (unit officially deprecated)](../image_source/17b6bc540011dae984b9f9b7d76bf706.png)
58.1 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ ( 0.081 ≈ 1/12 ) × molecular mass of fullerene ( ≈ 721 u )](../image_source/5f316a74a433f942e1ced5372a1ccb1b.png)
≈ ( 0.081 ≈ 1/12 ) × molecular mass of fullerene ( ≈ 721 u )
![≈ 0.3 × molecular mass of caffeine ( ≈ 194 u )](../image_source/a97dff7c0ce81730b23e57ad0ab15a04.png)
≈ 0.3 × molecular mass of caffeine ( ≈ 194 u )
![≈ 0.994 × molecular mass of sodium chloride ( 58.443 u )](../image_source/7043cc8de812a82c0334c6c23af17e55.png)
≈ 0.994 × molecular mass of sodium chloride ( 58.443 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 58](../image_source/2e283bfcd656142f0d87cc7a249143a0.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 58
![Molar mass M from M = m_aN_A: | 58 g/mol (grams per mole)](../image_source/62f6391616129ecafba58b85c0560243.png)
Molar mass M from M = m_aN_A: | 58 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 58](../image_source/276213251b5b60e8fb0c040d42d27a26.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 58
![Molar mass M from M = m_mN_A: | 58 g/mol (grams per mole)](../image_source/9291ce36ac439989cef6a4458b5246cd.png)
Molar mass M from M = m_mN_A: | 58 g/mol (grams per mole)