Input interpretation
![hafnium(II) chloride | molar mass](../image_source/7b5e9b5729c7c3d0dc13834ea97e0408.png)
hafnium(II) chloride | molar mass
Result
![Find the molar mass, M, for hafnium(II) chloride: 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: HfCl_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cl (chlorine) | 2 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) Cl (chlorine) | 2 | 35.45 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) Cl (chlorine) | 2 | 35.45 | 2 × 35.45 = 70.90 Hf (hafnium) | 1 | 178.49 | 1 × 178.49 = 178.49 M = 70.90 g/mol + 178.49 g/mol = 249.39 g/mol](../image_source/181d4e6e648040f6edd2aff20abd7fbe.png)
Find the molar mass, M, for hafnium(II) chloride: 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: HfCl_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cl (chlorine) | 2 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) Cl (chlorine) | 2 | 35.45 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) Cl (chlorine) | 2 | 35.45 | 2 × 35.45 = 70.90 Hf (hafnium) | 1 | 178.49 | 1 × 178.49 = 178.49 M = 70.90 g/mol + 178.49 g/mol = 249.39 g/mol
Unit conversion
![0.2494 kg/mol (kilograms per mole)](../image_source/7e249b6407a3321a43e6864d1e52abfb.png)
0.2494 kg/mol (kilograms per mole)
Comparisons
![≈ 0.35 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/91679827ff6a19bc72cb997183ed0273.png)
≈ 0.35 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/25bdf2ba2ca3694637104c8dd229c23e.png)
≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 4.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/34e28c5a72b5d0b99ce989f97170efc3.png)
≈ 4.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 4.1×10^-22 grams | 4.1×10^-25 kg (kilograms) | 249 u (unified atomic mass units) | 249 Da (daltons)](../image_source/56deb8aaa28babde09ecf31a3b728c69.png)
Mass of a molecule m from m = M/N_A: | 4.1×10^-22 grams | 4.1×10^-25 kg (kilograms) | 249 u (unified atomic mass units) | 249 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 249](../image_source/0a1698899fa1f786d24eb2c0b376b471.png)
Relative molecular mass M_r from M_r = M_u/M: | 249