Input interpretation
lithium p-toluenesulfinate | molar mass
Result
Find the molar mass, M, for lithium p-toluenesulfinate: 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: CH_3C_6H_4SO_2Li Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 7 H (hydrogen) | 7 Li (lithium) | 1 O (oxygen) | 2 S (sulfur) | 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) | 7 | 12.011 H (hydrogen) | 7 | 1.008 Li (lithium) | 1 | 6.94 O (oxygen) | 2 | 15.999 S (sulfur) | 1 | 32.06 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) | 7 | 12.011 | 7 × 12.011 = 84.077 H (hydrogen) | 7 | 1.008 | 7 × 1.008 = 7.056 Li (lithium) | 1 | 6.94 | 1 × 6.94 = 6.94 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 84.077 g/mol + 7.056 g/mol + 6.94 g/mol + 31.998 g/mol + 32.06 g/mol = 162.13 g/mol
Unit conversion
0.1621 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.22 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.83 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 2.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 2.7×10^-22 grams | 2.7×10^-25 kg (kilograms) | 162 u (unified atomic mass units) | 162 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 162