Input interpretation
![niobium pentoxide | molecular mass](../image_source/a9113f65c6090b0922de68e88e911b0f.png)
niobium pentoxide | molecular mass
Result
![Find the molecular mass, m, for niobium 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: Nb_2O_5 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Nb (niobium) | 2 O (oxygen) | 5 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 Nb (niobium) | 2 | 92.90637 O (oxygen) | 5 | 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 Nb (niobium) | 2 | 92.90637 | 2 × 92.90637 = 185.81274 O (oxygen) | 5 | 15.999 | 5 × 15.999 = 79.995 m = 185.81274 u + 79.995 u = 265.808 u](../image_source/1597998ce149dc5e04308dde4271e561.png)
Find the molecular mass, m, for niobium 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: Nb_2O_5 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Nb (niobium) | 2 O (oxygen) | 5 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 Nb (niobium) | 2 | 92.90637 O (oxygen) | 5 | 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 Nb (niobium) | 2 | 92.90637 | 2 × 92.90637 = 185.81274 O (oxygen) | 5 | 15.999 | 5 × 15.999 = 79.995 m = 185.81274 u + 79.995 u = 265.808 u
Unit conversions
![265.808 Da (daltons)](../image_source/6741d25ae91fe8783c7bb7ba560acfca.png)
265.808 Da (daltons)
![0.265808 kDa (kilodaltons)](../image_source/35b04326989bcf6be139c5cff0fd9bf3.png)
0.265808 kDa (kilodaltons)
![4.4138×10^-22 grams](../image_source/d7bc935dc5a7e8d1e6b0efd02fa76c23.png)
4.4138×10^-22 grams
![4.4138×10^-25 kg (kilograms)](../image_source/5a3604980b1f05b9362311a96b55d6b9.png)
4.4138×10^-25 kg (kilograms)
![265.82 chemical atomic mass units (unit officially deprecated)](../image_source/24756e7215f336e07cf47bd6d2b50ea7.png)
265.82 chemical atomic mass units (unit officially deprecated)
![265.892 physical atomic mass units (unit officially deprecated)](../image_source/209a1779823b3cd90c5d42472c63b83e.png)
265.892 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ 0.37 × molecular mass of fullerene ( ≈ 721 u )](../image_source/041cd34a72b2230fb8fe9f4316bf6832.png)
≈ 0.37 × molecular mass of fullerene ( ≈ 721 u )
![≈ 1.4 × molecular mass of caffeine ( ≈ 194 u )](../image_source/60e9dbb34e8db0cbc1a6d44bb91fcd5d.png)
≈ 1.4 × molecular mass of caffeine ( ≈ 194 u )
![≈ 4.5 × molecular mass of sodium chloride ( ≈ 58 u )](../image_source/74fcf331fff3425173b01da444ad122b.png)
≈ 4.5 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 266](../image_source/bf56d171be3ed386c5d02d070550cfd3.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 266
![Molar mass M from M = m_aN_A: | 266 g/mol (grams per mole)](../image_source/9007aa40be656fc0f52a79aab4de9cef.png)
Molar mass M from M = m_aN_A: | 266 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 266](../image_source/e4bb06d57a250f67a5bfc077173f25e3.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 266
![Molar mass M from M = m_mN_A: | 266 g/mol (grams per mole)](../image_source/dd8084b2e8f673f567c810f08a405a4b.png)
Molar mass M from M = m_mN_A: | 266 g/mol (grams per mole)