Input interpretation
thallium(I) oxalate | molar mass
Result
Find the molar mass, M, for thallium(I) oxalate: 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: Tl_2C_2O_4 Use the chemical formula, Tl_2C_2O_4, to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 O (oxygen) | 4 Tl (thallium) | 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) | 2 | 12.011 O (oxygen) | 4 | 15.999 Tl (thallium) | 2 | 204.38 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) | 2 | 12.011 | 2 × 12.011 = 24.022 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 Tl (thallium) | 2 | 204.38 | 2 × 204.38 = 408.76 M = 24.022 g/mol + 63.996 g/mol + 408.76 g/mol = 496.78 g/mol
Unit conversion
0.49678 kg/mol (kilograms per mole)
Comparisons
≈ 0.69 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 2.6 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 8.5 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 8.2×10^-22 grams | 8.2×10^-25 kg (kilograms) | 497 u (unified atomic mass units) | 497 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 497