Input interpretation
thallium(I) azide | molar mass
Result
Find the molar mass, M, for thallium(I) 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: TlN_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i N (nitrogen) | 3 Tl (thallium) | 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 Tl (thallium) | 1 | 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) N (nitrogen) | 3 | 14.007 | 3 × 14.007 = 42.021 Tl (thallium) | 1 | 204.38 | 1 × 204.38 = 204.38 M = 42.021 g/mol + 204.38 g/mol = 246.40 g/mol
Unit conversion
0.2464 kg/mol (kilograms per mole)