Input interpretation
![calcium hexaboride | molar mass](../image_source/c61e1504dd193eb2883f253859730fc9.png)
calcium hexaboride | molar mass
Result
![Find the molar mass, M, for calcium hexaboride: 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: CaB_6 Use the chemical formula, CaB_6, to count the number of atoms, N_i, for each element: | N_i B (boron) | 6 Ca (calcium) | 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) B (boron) | 6 | 10.81 Ca (calcium) | 1 | 40.078 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) B (boron) | 6 | 10.81 | 6 × 10.81 = 64.86 Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 M = 64.86 g/mol + 40.078 g/mol = 104.94 g/mol](../image_source/b2896d9de47e44c580e81ac5bfe44c8f.png)
Find the molar mass, M, for calcium hexaboride: 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: CaB_6 Use the chemical formula, CaB_6, to count the number of atoms, N_i, for each element: | N_i B (boron) | 6 Ca (calcium) | 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) B (boron) | 6 | 10.81 Ca (calcium) | 1 | 40.078 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) B (boron) | 6 | 10.81 | 6 × 10.81 = 64.86 Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 M = 64.86 g/mol + 40.078 g/mol = 104.94 g/mol
Unit conversion
![0.1049 kg/mol (kilograms per mole)](../image_source/5b7f8865040265880985b3ecd08e3ed3.png)
0.1049 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.15 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/33307d57d47e6700b6f729820d360fc2.png)
≈ ( 0.15 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.54 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/8514a0490c2a8bb05476e2b719f9178f.png)
≈ 0.54 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.8 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/17421db6e32192402f1317563353a2b9.png)
≈ 1.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.7×10^-22 grams | 1.7×10^-25 kg (kilograms) | 105 u (unified atomic mass units) | 105 Da (daltons)](../image_source/8cce8e5ec0494e131f052a05b870e44f.png)
Mass of a molecule m from m = M/N_A: | 1.7×10^-22 grams | 1.7×10^-25 kg (kilograms) | 105 u (unified atomic mass units) | 105 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 105](../image_source/d6e4db3e39c835104999b6a3b283f331.png)
Relative molecular mass M_r from M_r = M_u/M: | 105