Input interpretation
tributylmethylphosphonium dibutyl phosphate | molar mass
Result
Find the molar mass, M, for tributylmethylphosphonium dibutyl phosphate: 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_21H_48O_4P_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i P (phosphorus) | 2 O (oxygen) | 4 C (carbon) | 21 H (hydrogen) | 48 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) P (phosphorus) | 2 | 30.973761998 O (oxygen) | 4 | 15.999 C (carbon) | 21 | 12.011 H (hydrogen) | 48 | 1.008 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) P (phosphorus) | 2 | 30.973761998 | 2 × 30.973761998 = 61.947523996 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 C (carbon) | 21 | 12.011 | 21 × 12.011 = 252.231 H (hydrogen) | 48 | 1.008 | 48 × 1.008 = 48.384 M = 61.947523996 g/mol + 63.996 g/mol + 252.231 g/mol + 48.384 g/mol = 426.559 g/mol
Unit conversion
0.4266 kg/mol (kilograms per mole)
Comparisons
≈ 0.59 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 2.2 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 7.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 7.1×10^-22 grams | 7.1×10^-25 kg (kilograms) | 427 u (unified atomic mass units) | 427 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 427