Input interpretation
p-anisylboronic acid | molar mass
Result
Find the molar mass, M, for p-anisylboronic 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: CH_3OC_6H_4B(OH)_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i B (boron) | 1 C (carbon) | 7 H (hydrogen) | 9 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 H (hydrogen) | 9 | 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 H (hydrogen) | 9 | 1.008 | 9 × 1.008 = 9.072 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 M = 10.81 g/mol + 84.077 g/mol + 9.072 g/mol + 47.997 g/mol = 151.96 g/mol
Unit conversion
0.15196 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.21 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.78 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 2.6 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 2.5×10^-22 grams | 2.5×10^-25 kg (kilograms) | 152 u (unified atomic mass units) | 152 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 152