Input interpretation
5-chloro-2-methoxyphenylboronic acid | molar mass
Result
Find the molar mass, M, for 5-chloro-2-methoxyphenylboronic acid: 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: ClC_6H_3(OCH_3)B(OH)_2 Use the chemical formula, ClC_6H_3(OCH_3)B(OH)_2, to count the number of atoms, N_i, for each element: | N_i B (boron) | 1 C (carbon) | 7 Cl (chlorine) | 1 H (hydrogen) | 8 O (oxygen) | 3 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) B (boron) | 1 | 10.81 C (carbon) | 7 | 12.011 Cl (chlorine) | 1 | 35.45 H (hydrogen) | 8 | 1.008 O (oxygen) | 3 | 15.999 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) B (boron) | 1 | 10.81 | 1 × 10.81 = 10.81 C (carbon) | 7 | 12.011 | 7 × 12.011 = 84.077 Cl (chlorine) | 1 | 35.45 | 1 × 35.45 = 35.45 H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 M = 10.81 g/mol + 84.077 g/mol + 35.45 g/mol + 8.064 g/mol + 47.997 g/mol = 186.40 g/mol
Unit conversion
0.1864 kg/mol (kilograms per mole)
Comparisons
≈ 0.26 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.96 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 3.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 3.1×10^-22 grams | 3.1×10^-25 kg (kilograms) | 186 u (unified atomic mass units) | 186 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 186