Input interpretation
4-sulfophenyl isothiocyanate sodium salt monohydrate | molar mass
Result
Find the molar mass, M, for 4-sulfophenyl isothiocyanate sodium salt monohydrate: 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_7H_7NNaO_4S_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i O (oxygen) | 4 Na (sodium) | 1 S (sulfur) | 2 C (carbon) | 7 N (nitrogen) | 1 H (hydrogen) | 7 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) O (oxygen) | 4 | 15.999 Na (sodium) | 1 | 22.98976928 S (sulfur) | 2 | 32.06 C (carbon) | 7 | 12.011 N (nitrogen) | 1 | 14.007 H (hydrogen) | 7 | 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) O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 Na (sodium) | 1 | 22.98976928 | 1 × 22.98976928 = 22.98976928 S (sulfur) | 2 | 32.06 | 2 × 32.06 = 64.12 C (carbon) | 7 | 12.011 | 7 × 12.011 = 84.077 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 H (hydrogen) | 7 | 1.008 | 7 × 1.008 = 7.056 M = 63.996 g/mol + 22.98976928 g/mol + 64.12 g/mol + 84.077 g/mol + 14.007 g/mol + 7.056 g/mol = 256.25 g/mol
Unit conversion
0.2563 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) | 256 u (unified atomic mass units) | 256 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 256