Input interpretation
![calcium fluoride | molar mass](../image_source/fef7ef23cd49927bf31f9531ef30395e.png)
calcium fluoride | molar mass
Result
![Find the molar mass, M, for calcium fluoride: 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: CaF_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Ca (calcium) | 1 F (fluorine) | 2 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) Ca (calcium) | 1 | 40.078 F (fluorine) | 2 | 18.998403163 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) Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 F (fluorine) | 2 | 18.998403163 | 2 × 18.998403163 = 37.996806326 M = 40.078 g/mol + 37.996806326 g/mol = 78.075 g/mol](../image_source/e9b37f4b957cbf8a65fb915abec25327.png)
Find the molar mass, M, for calcium fluoride: 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: CaF_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Ca (calcium) | 1 F (fluorine) | 2 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) Ca (calcium) | 1 | 40.078 F (fluorine) | 2 | 18.998403163 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) Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 F (fluorine) | 2 | 18.998403163 | 2 × 18.998403163 = 37.996806326 M = 40.078 g/mol + 37.996806326 g/mol = 78.075 g/mol
Unit conversion
![0.078075 kg/mol (kilograms per mole)](../image_source/9263a64e295eaff6cdc9fcb125491ffd.png)
0.078075 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.11 ≈ 1/9 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/3c705ecbc66464991ab391153b694e14.png)
≈ ( 0.11 ≈ 1/9 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.4 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/29e81ef6410bdb3ac8b825905d89ad1f.png)
≈ 0.4 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/3a9a2444d3807dc52558de64e92aeb51.png)
≈ 1.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.3×10^-22 grams | 1.3×10^-25 kg (kilograms) | 78 u (unified atomic mass units) | 78 Da (daltons)](../image_source/86749965ba013e83ac8047b66b0e5c1e.png)
Mass of a molecule m from m = M/N_A: | 1.3×10^-22 grams | 1.3×10^-25 kg (kilograms) | 78 u (unified atomic mass units) | 78 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 78](../image_source/9375e9a1f3f740d9ff3ef551403c7be2.png)
Relative molecular mass M_r from M_r = M_u/M: | 78