Input interpretation
![scandium sulfide | molar mass](../image_source/03a411ce03642cf68b0dbe994834ce41.png)
scandium sulfide | molar mass
Result
![Find the molar mass, M, for scandium sulfide: 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: Sc_2S_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i S (sulfur) | 3 Sc (scandium) | 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) S (sulfur) | 3 | 32.06 Sc (scandium) | 2 | 44.955908 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) S (sulfur) | 3 | 32.06 | 3 × 32.06 = 96.18 Sc (scandium) | 2 | 44.955908 | 2 × 44.955908 = 89.911816 M = 96.18 g/mol + 89.911816 g/mol = 186.09 g/mol](../image_source/caf004cfdb2edf8eb377a2cebe53be47.png)
Find the molar mass, M, for scandium sulfide: 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: Sc_2S_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i S (sulfur) | 3 Sc (scandium) | 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) S (sulfur) | 3 | 32.06 Sc (scandium) | 2 | 44.955908 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) S (sulfur) | 3 | 32.06 | 3 × 32.06 = 96.18 Sc (scandium) | 2 | 44.955908 | 2 × 44.955908 = 89.911816 M = 96.18 g/mol + 89.911816 g/mol = 186.09 g/mol
Unit conversion
![0.1861 kg/mol (kilograms per mole)](../image_source/5b73c05bf40a9ac6d4a1c49ebda9ff1d.png)
0.1861 kg/mol (kilograms per mole)
Comparisons
![≈ 0.26 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/5ac9b177664a8c20f6d57d0dbedc192c.png)
≈ 0.26 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.96 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/6abce30f4f5e8757c33f949ed112c9b9.png)
≈ 0.96 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 3.2 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/40abb2db64f600cbf304475224cb95b2.png)
≈ 3.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.1×10^-22 grams | 3.1×10^-25 kg (kilograms) | 186 u (unified atomic mass units) | 186 Da (daltons)](../image_source/35a73225a83397c93420f0b50e9657c5.png)
Mass of a molecule m from m = M/N_A: | 3.1×10^-22 grams | 3.1×10^-25 kg (kilograms) | 186 u (unified atomic mass units) | 186 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 186](../image_source/353113a8085f3ed12899508d85ef8220.png)
Relative molecular mass M_r from M_r = M_u/M: | 186