Input interpretation
copper(II) oxalate hemihydrate | molecular mass
Result
Find the molecular mass, m, for copper(II) oxalate hemihydrate: 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: CuC_2O_4·0.5H_2O Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 4 Cu (copper) | 2 H (hydrogen) | 2 O (oxygen) | 9 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) | 4 | 12.011 Cu (copper) | 2 | 63.546 H (hydrogen) | 2 | 1.008 O (oxygen) | 9 | 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) | 4 | 12.011 | 4 × 12.011 = 48.044 Cu (copper) | 2 | 63.546 | 2 × 63.546 = 127.092 H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 9 | 15.999 | 9 × 15.999 = 143.991 m = 48.044 u + 127.092 u + 2.016 u + 143.991 u = 321.143 u
Unit conversions
321.14 Da (daltons)
0.32114 kDa (kilodaltons)
5.3327×10^-22 grams
5.3327×10^-25 kg (kilograms)
321.16 chemical atomic mass units (unit officially deprecated)
321.25 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
≈ 0.45 × molecular mass of fullerene ( ≈ 721 u )
≈ 1.7 × molecular mass of caffeine ( ≈ 194 u )
≈ 5.5 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 321
Molar mass M from M = m_aN_A: | 321 g/mol (grams per mole)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 321
Molar mass M from M = m_mN_A: | 321 g/mol (grams per mole)