Input interpretation
uranyl nitrate | molecular mass
Result
Find the molecular mass, m, for uranyl nitrate: 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: U_2(NO_3)_2 Use the chemical formula, U_2(NO_3)_2, to count the number of atoms, N_i, for each element: | N_i N (nitrogen) | 2 O (oxygen) | 8 U (uranium) | 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 N (nitrogen) | 2 | 14.007 O (oxygen) | 8 | 15.999 U (uranium) | 1 | 238.02891 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 N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 8 | 15.999 | 8 × 15.999 = 127.992 U (uranium) | 1 | 238.02891 | 1 × 238.02891 = 238.02891 m = 28.014 u + 127.992 u + 238.02891 u = 394.035 u
Unit conversions
394.03 Da (daltons)
0.39403 kDa (kilodaltons)
6.5431×10^-22 grams
6.5431×10^-25 kg (kilograms)
394.05 chemical atomic mass units (unit officially deprecated)
394.16 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
≈ 0.55 × molecular mass of fullerene ( ≈ 721 u )
≈ 2 × molecular mass of caffeine ( ≈ 194 u )
≈ 6.7 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 394
Molar mass M from M = m_aN_A: | 394 g/mol (grams per mole)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 394
Molar mass M from M = m_mN_A: | 394 g/mol (grams per mole)