Input interpretation
5-chloro-2-methylbenzothiazole | molar mass
Result
Find the molar mass, M, for 5-chloro-2-methylbenzothiazole: 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_8H_6ClNS Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 8 Cl (chlorine) | 1 H (hydrogen) | 6 N (nitrogen) | 1 S (sulfur) | 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) | 8 | 12.011 Cl (chlorine) | 1 | 35.45 H (hydrogen) | 6 | 1.008 N (nitrogen) | 1 | 14.007 S (sulfur) | 1 | 32.06 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) | 8 | 12.011 | 8 × 12.011 = 96.088 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 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 96.088 g/mol + 35.45 g/mol + 6.048 g/mol + 14.007 g/mol + 32.06 g/mol = 183.65 g/mol
Unit conversion
0.1837 kg/mol (kilograms per mole)
Comparisons
≈ 0.25 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.95 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 3.1 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 3×10^-22 grams | 3×10^-25 kg (kilograms) | 184 u (unified atomic mass units) | 184 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 184