Input interpretation
![hafnium(IV) bromide | molar mass](../image_source/0a22d2f631bd3d8253cb3d5da4668332.png)
hafnium(IV) bromide | molar mass
Result
![Find the molar mass, M, for hafnium(IV) bromide: 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: HfBr_4 Use the chemical formula, HfBr_4, to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 4 Hf (hafnium) | 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) Br (bromine) | 4 | 79.904 Hf (hafnium) | 1 | 178.49 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) Br (bromine) | 4 | 79.904 | 4 × 79.904 = 319.616 Hf (hafnium) | 1 | 178.49 | 1 × 178.49 = 178.49 M = 319.616 g/mol + 178.49 g/mol = 498.11 g/mol](../image_source/c116e99ad2ff83516d836b9cf93f5ef8.png)
Find the molar mass, M, for hafnium(IV) bromide: 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: HfBr_4 Use the chemical formula, HfBr_4, to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 4 Hf (hafnium) | 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) Br (bromine) | 4 | 79.904 Hf (hafnium) | 1 | 178.49 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) Br (bromine) | 4 | 79.904 | 4 × 79.904 = 319.616 Hf (hafnium) | 1 | 178.49 | 1 × 178.49 = 178.49 M = 319.616 g/mol + 178.49 g/mol = 498.11 g/mol
Unit conversion
![0.49811 kg/mol (kilograms per mole)](../image_source/48dceb6cf27cce5563a369166ab86a42.png)
0.49811 kg/mol (kilograms per mole)
Comparisons
![≈ 0.69 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/7fe3e8b2833c856345364e93ecff454a.png)
≈ 0.69 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 2.6 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/1d95facc848728d0ef01a542bcec707f.png)
≈ 2.6 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 8.5 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/45e82f19225989b7fd0f9a15ca34de93.png)
≈ 8.5 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 8.3×10^-22 grams | 8.3×10^-25 kg (kilograms) | 498 u (unified atomic mass units) | 498 Da (daltons)](../image_source/ae769ef6470313779cb6b2682c548024.png)
Mass of a molecule m from m = M/N_A: | 8.3×10^-22 grams | 8.3×10^-25 kg (kilograms) | 498 u (unified atomic mass units) | 498 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 498](../image_source/9628406079cfa4ced601619b82d34e93.png)
Relative molecular mass M_r from M_r = M_u/M: | 498