Input interpretation
![arsenic(V) sulfide | molar mass](../image_source/0510adb51603d8ab131a174e2907400b.png)
arsenic(V) sulfide | molar mass
Result
![Find the molar mass, M, for arsenic(V) 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: As_2S_5 Use the chemical formula, As_2S_5, to count the number of atoms, N_i, for each element: | N_i As (arsenic) | 2 S (sulfur) | 5 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) As (arsenic) | 2 | 74.921595 S (sulfur) | 5 | 32.06 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) As (arsenic) | 2 | 74.921595 | 2 × 74.921595 = 149.843190 S (sulfur) | 5 | 32.06 | 5 × 32.06 = 160.30 M = 149.843190 g/mol + 160.30 g/mol = 310.14 g/mol](../image_source/20f3736e824d8c2a324d97b485b7d8a5.png)
Find the molar mass, M, for arsenic(V) 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: As_2S_5 Use the chemical formula, As_2S_5, to count the number of atoms, N_i, for each element: | N_i As (arsenic) | 2 S (sulfur) | 5 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) As (arsenic) | 2 | 74.921595 S (sulfur) | 5 | 32.06 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) As (arsenic) | 2 | 74.921595 | 2 × 74.921595 = 149.843190 S (sulfur) | 5 | 32.06 | 5 × 32.06 = 160.30 M = 149.843190 g/mol + 160.30 g/mol = 310.14 g/mol
Unit conversion
![0.3101 kg/mol (kilograms per mole)](../image_source/bc9b37aeae89d004824cf133ead9dc7b.png)
0.3101 kg/mol (kilograms per mole)
Comparisons
![≈ 0.43 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/a1fd19e9ff9c7896e0251b61a1375cbf.png)
≈ 0.43 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.6 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/9ca609b1327035188afc322d25feea54.png)
≈ 1.6 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 5.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/d7c643a1e9acfcad414b43488a3d7324.png)
≈ 5.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 5.2×10^-22 grams | 5.2×10^-25 kg (kilograms) | 310 u (unified atomic mass units) | 310 Da (daltons)](../image_source/850a4938bce8775cdcbac4b4698c1b35.png)
Mass of a molecule m from m = M/N_A: | 5.2×10^-22 grams | 5.2×10^-25 kg (kilograms) | 310 u (unified atomic mass units) | 310 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 310](../image_source/05546e96718c09af7185a39ae23e94ed.png)
Relative molecular mass M_r from M_r = M_u/M: | 310