Input interpretation
2-amino-5-chlorobenzoic acid | molar mass
Result
Find the molar mass, M, for 2-amino-5-chlorobenzoic 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: H_2NC_6H_3(Cl)CO_2H Use the chemical formula, H_2NC_6H_3(Cl)CO_2H, to count the number of atoms, N_i, for each element: | N_i C (carbon) | 7 Cl (chlorine) | 1 H (hydrogen) | 6 N (nitrogen) | 1 O (oxygen) | 2 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 Cl (chlorine) | 1 | 35.45 H (hydrogen) | 6 | 1.008 N (nitrogen) | 1 | 14.007 O (oxygen) | 2 | 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) C (carbon) | 7 | 12.011 | 7 × 12.011 = 84.077 Cl (chlorine) | 1 | 35.45 | 1 × 35.45 = 35.45 H (hydrogen) | 6 | 1.008 | 6 × 1.008 = 6.048 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 84.077 g/mol + 35.45 g/mol + 6.048 g/mol + 14.007 g/mol + 31.998 g/mol = 171.58 g/mol
Unit conversion
0.1716 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.24 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.88 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 2.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 2.8×10^-22 grams | 2.8×10^-25 kg (kilograms) | 172 u (unified atomic mass units) | 172 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 172