Input interpretation
chlormequat | molar mass
Result
Find the molar mass, M, for chlormequat: 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_3)_3N(Cl)CH_2CH_2Cl Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 5 Cl (chlorine) | 2 H (hydrogen) | 13 N (nitrogen) | 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) | 5 | 12.011 Cl (chlorine) | 2 | 35.45 H (hydrogen) | 13 | 1.008 N (nitrogen) | 1 | 14.007 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) | 5 | 12.011 | 5 × 12.011 = 60.055 Cl (chlorine) | 2 | 35.45 | 2 × 35.45 = 70.90 H (hydrogen) | 13 | 1.008 | 13 × 1.008 = 13.104 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 M = 60.055 g/mol + 70.90 g/mol + 13.104 g/mol + 14.007 g/mol = 158.07 g/mol
Unit conversion
0.1581 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.22 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.81 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 2.7 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 2.6×10^-22 grams | 2.6×10^-25 kg (kilograms) | 158 u (unified atomic mass units) | 158 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 158