Input interpretation
trimethylphenylphosphonium iodide | molecular mass
Result
Find the molecular mass, m, for trimethylphenylphosphonium iodide: 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: C_6H_5P(CH_3)_3I Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 9 H (hydrogen) | 14 I (iodine) | 1 P (phosphorus) | 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 C (carbon) | 9 | 12.011 H (hydrogen) | 14 | 1.008 I (iodine) | 1 | 126.90447 P (phosphorus) | 1 | 30.973761998 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) | 9 | 12.011 | 9 × 12.011 = 108.099 H (hydrogen) | 14 | 1.008 | 14 × 1.008 = 14.112 I (iodine) | 1 | 126.90447 | 1 × 126.90447 = 126.90447 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 m = 108.099 u + 14.112 u + 126.90447 u + 30.973761998 u = 280.089 u
Unit conversions
280.09 Da (daltons)
0.28009 kDa (kilodaltons)
4.651×10^-22 grams
4.651×10^-25 kg (kilograms)
280.1 chemical atomic mass units (unit officially deprecated)
280.18 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
≈ 0.39 × molecular mass of fullerene ( ≈ 721 u )
≈ 1.4 × molecular mass of caffeine ( ≈ 194 u )
≈ 4.8 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 280
Molar mass M from M = m_aN_A: | 280 g/mol (grams per mole)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 280
Molar mass M from M = m_mN_A: | 280 g/mol (grams per mole)