Input interpretation
![oxygen | molecular mass](../image_source/5afd8d4195e9c3f8c8423b3ca6f327fe.png)
oxygen | molecular mass
Result
![Find the molecular mass, m, for oxygen: 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: O_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i 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 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 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 m = 31.998 u](../image_source/bee6625e9134cfbc75fb896c770d5ba4.png)
Find the molecular mass, m, for oxygen: 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: O_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i 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 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 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 m = 31.998 u
Unit conversions
![31.998 Da (daltons)](../image_source/c059a256c98862c40ca1f06c3274783f.png)
31.998 Da (daltons)
![0.031998 kDa (kilodaltons)](../image_source/1ff0ec4eda73053f61a95294435bcaa1.png)
0.031998 kDa (kilodaltons)
![5.3134×10^-23 grams](../image_source/14a0eec89bc046420baa0673139b9bcc.png)
5.3134×10^-23 grams
![5.3134×10^-26 kg (kilograms)](../image_source/c0fec4bb98dd68ec3596d92844f3ddeb.png)
5.3134×10^-26 kg (kilograms)
![31.999 chemical atomic mass units (unit officially deprecated)](../image_source/f2c2a5468d0228dd05bcb14cbf3ff736.png)
31.999 chemical atomic mass units (unit officially deprecated)
![32.008 physical atomic mass units (unit officially deprecated)](../image_source/ba82ef68efc0c7da05c1b97973e46673.png)
32.008 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ ( 0.16 ≈ 1/6 ) × molecular mass of caffeine ( ≈ 194 u )](../image_source/115addab0a1859c7524e165a53ed19bf.png)
≈ ( 0.16 ≈ 1/6 ) × molecular mass of caffeine ( ≈ 194 u )
![≈ 0.55 × molecular mass of sodium chloride ( ≈ 58 u )](../image_source/8c697144e0970e6faf25844c0f53798e.png)
≈ 0.55 × molecular mass of sodium chloride ( ≈ 58 u )
![≈ 1.8 × molecular mass of water ( ≈ 18 u )](../image_source/ea8a188afa2644abf95b8d0e90ec838f.png)
≈ 1.8 × molecular mass of water ( ≈ 18 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 32](../image_source/e9e1112c5e5f62f1e9dd16f370cc52f5.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 32
![Molar mass M from M = m_aN_A: | 32 g/mol (grams per mole)](../image_source/2b87b93b939035de98235d74b618dd33.png)
Molar mass M from M = m_aN_A: | 32 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 32](../image_source/90060ba7d685717b741d99124cb2bc4d.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 32
![Molar mass M from M = m_mN_A: | 32 g/mol (grams per mole)](../image_source/97d2a0386faabd8519a9a0ab4dcb20c8.png)
Molar mass M from M = m_mN_A: | 32 g/mol (grams per mole)