Input interpretation
choline glycerophosphate | molar mass
Result
Find the molar mass, M, for choline glycerophosphate: 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_8H_20NO_6P Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 8 H (hydrogen) | 20 N (nitrogen) | 1 O (oxygen) | 6 P (phosphorus) | 1 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) C (carbon) | 8 | 12.011 H (hydrogen) | 20 | 1.008 N (nitrogen) | 1 | 14.007 O (oxygen) | 6 | 15.999 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 molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) C (carbon) | 8 | 12.011 | 8 × 12.011 = 96.088 H (hydrogen) | 20 | 1.008 | 20 × 1.008 = 20.160 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 O (oxygen) | 6 | 15.999 | 6 × 15.999 = 95.994 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 96.088 g/mol + 20.160 g/mol + 14.007 g/mol + 95.994 g/mol + 30.973761998 g/mol = 257.223 g/mol
Unit conversion
0.25722 kg/mol (kilograms per mole)
Comparisons
≈ 0.36 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 4.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 4.3×10^-22 grams | 4.3×10^-25 kg (kilograms) | 257 u (unified atomic mass units) | 257 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 257