Input interpretation
sodium azide | molar mass
Result
Find the molar mass, M, for sodium azide: 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: NaN_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i N (nitrogen) | 3 Na (sodium) | 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) N (nitrogen) | 3 | 14.007 Na (sodium) | 1 | 22.98976928 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) N (nitrogen) | 3 | 14.007 | 3 × 14.007 = 42.021 Na (sodium) | 1 | 22.98976928 | 1 × 22.98976928 = 22.98976928 M = 42.021 g/mol + 22.98976928 g/mol = 65.011 g/mol
Unit conversion
0.065011 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.09 ≈ 1/11 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.33 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 1.1 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 1.1×10^-22 grams | 1.1×10^-25 kg (kilograms) | 65 u (unified atomic mass units) | 65 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 65