Input interpretation
cobalt(II) iodate | molar mass
Result
Find the molar mass, M, for cobalt(II) iodate: 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: Co(IO_3)_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Co (cobalt) | 1 I (iodine) | 2 O (oxygen) | 6 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) Co (cobalt) | 1 | 58.933194 I (iodine) | 2 | 126.90447 O (oxygen) | 6 | 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) Co (cobalt) | 1 | 58.933194 | 1 × 58.933194 = 58.933194 I (iodine) | 2 | 126.90447 | 2 × 126.90447 = 253.80894 O (oxygen) | 6 | 15.999 | 6 × 15.999 = 95.994 M = 58.933194 g/mol + 253.80894 g/mol + 95.994 g/mol = 408.736 g/mol
Unit conversion
0.408736 kg/mol (kilograms per mole)
Comparisons
≈ 0.57 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 2.1 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 7 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 6.8×10^-22 grams | 6.8×10^-25 kg (kilograms) | 409 u (unified atomic mass units) | 409 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 409