Input interpretation
![antimony pentoxide | molecular mass](../image_source/e0956a7b88619f1354e9e44df65b7a76.png)
antimony pentoxide | molecular mass
Result
![Find the molecular mass, m, for antimony pentoxide: 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: Sb_2O_5 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i O (oxygen) | 5 Sb (antimony) | 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) | 5 | 15.999 Sb (antimony) | 2 | 121.760 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) | 5 | 15.999 | 5 × 15.999 = 79.995 Sb (antimony) | 2 | 121.760 | 2 × 121.760 = 243.520 m = 79.995 u + 243.520 u = 323.515 u](../image_source/e44ce725683b2874d06aa6b9b637dfb9.png)
Find the molecular mass, m, for antimony pentoxide: 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: Sb_2O_5 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i O (oxygen) | 5 Sb (antimony) | 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) | 5 | 15.999 Sb (antimony) | 2 | 121.760 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) | 5 | 15.999 | 5 × 15.999 = 79.995 Sb (antimony) | 2 | 121.760 | 2 × 121.760 = 243.520 m = 79.995 u + 243.520 u = 323.515 u
Unit conversions
![323.51 Da (daltons)](../image_source/a6c067e94b90d00e50ba1d9c681477b5.png)
323.51 Da (daltons)
![0.32351 kDa (kilodaltons)](../image_source/425b852bd9fbd22092e2d1ca5ff66e79.png)
0.32351 kDa (kilodaltons)
![5.3721×10^-22 grams](../image_source/9089e03babc2b9758244fa13b2309e92.png)
5.3721×10^-22 grams
![5.3721×10^-25 kg (kilograms)](../image_source/f7c0b243c495bc1426c923dbec4cb8f3.png)
5.3721×10^-25 kg (kilograms)
![323.53 chemical atomic mass units (unit officially deprecated)](../image_source/04eae736f538720cb435ab6e33e496c7.png)
323.53 chemical atomic mass units (unit officially deprecated)
![323.62 physical atomic mass units (unit officially deprecated)](../image_source/00420ea3712cd30ae7d790b1a0a8663a.png)
323.62 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ 0.45 × molecular mass of fullerene ( ≈ 721 u )](../image_source/6add84386582baef652fbf0fab0686e1.png)
≈ 0.45 × molecular mass of fullerene ( ≈ 721 u )
![≈ 1.7 × molecular mass of caffeine ( ≈ 194 u )](../image_source/6487199affa9745b13ea431a45cd11f7.png)
≈ 1.7 × molecular mass of caffeine ( ≈ 194 u )
![≈ 5.5 × molecular mass of sodium chloride ( ≈ 58 u )](../image_source/bea0b8f2909d7766934877640e3a3f77.png)
≈ 5.5 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 324](../image_source/9ae78ae8760483d82ef6b2cb60534bbd.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 324
![Molar mass M from M = m_aN_A: | 324 g/mol (grams per mole)](../image_source/a30914ea292df78f916edea8d82f884d.png)
Molar mass M from M = m_aN_A: | 324 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 324](../image_source/57f63235643928fc8d5928b7ae4d828c.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 324
![Molar mass M from M = m_mN_A: | 324 g/mol (grams per mole)](../image_source/aa874c5eed97dfad35c54479e6f8903a.png)
Molar mass M from M = m_mN_A: | 324 g/mol (grams per mole)