Input interpretation
![calcium carbide | molar mass](../image_source/578ff366fda70c4f5f40e05d0cc72288.png)
calcium carbide | molar mass
Result
![Find the molar mass, M, for calcium carbide: 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: CaC_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 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) C (carbon) | 2 | 12.011 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) C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 M = 24.022 g/mol + 40.078 g/mol = 64.100 g/mol](../image_source/eb48d4eadc3792d6f8c4ef8652195e68.png)
Find the molar mass, M, for calcium carbide: 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: CaC_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 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) C (carbon) | 2 | 12.011 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) C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 M = 24.022 g/mol + 40.078 g/mol = 64.100 g/mol
Unit conversion
![0.0641 kg/mol (kilograms per mole)](../image_source/cb8f49b2c641faf7955e279880c1f10c.png)
0.0641 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.089 ≈ 1/11 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/f338d82ca208a2b06baa0718aa1107a6.png)
≈ ( 0.089 ≈ 1/11 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.33 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/c4d2fd0db56ddf608bead6881ff4dc99.png)
≈ 0.33 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.1 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/93da3941012c444c48a1c6b2a2d52adb.png)
≈ 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) | 64 u (unified atomic mass units) | 64 Da (daltons)](../image_source/cb31d842f1a5e790a65fdb48eb2229d4.png)
Mass of a molecule m from m = M/N_A: | 1.1×10^-22 grams | 1.1×10^-25 kg (kilograms) | 64 u (unified atomic mass units) | 64 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 64](../image_source/bcb913f86999ed73f91afbedcbb091e6.png)
Relative molecular mass M_r from M_r = M_u/M: | 64