Input interpretation
sodium tellurite | molar mass
Result
Find the molar mass, M, for sodium tellurite: 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: Na_2TeO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | number of atoms Na (sodium) | 2 O (oxygen) | 3 Te (tellurium) | 1 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | number of atoms | atomic mass/g·mol^(-1) Na (sodium) | 2 | 22.98976928 O (oxygen) | 3 | 15.999 Te (tellurium) | 1 | 127.60 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | number of atoms | atomic mass/g·mol^(-1) | mass/g·mol^(-1) Na (sodium) | 2 | 22.98976928 | 2 × 22.98976928 = 45.97953856 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 Te (tellurium) | 1 | 127.60 | 1 × 127.60 = 127.60 M = 45.97953856 g/mol + 47.997 g/mol + 127.60 g/mol = 221.58 g/mol
Unit conversion
0.22158 kg/mol (kilograms per mole)
Comparisons
≈ 0.31 × molar mass of fullerene (≈ 721 g/mol )
≈ 1.1 × molar mass of caffeine (≈ 194 g/mol )
≈ 3.8 × molar mass of sodium chloride (≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 3.7×10^-22 grams | 3.7×10^-25 kg (kilograms) | 222 u (unified atomic mass units) | 222 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 222