Input interpretation
![ammonium persulfate | molar mass](../image_source/1749167a31041a2397409b4960057481.png)
ammonium persulfate | molar mass
Result
![Find the molar mass, M, for ammonium persulfate: 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: (NH_4)_2S_2O_8 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 8 N (nitrogen) | 2 O (oxygen) | 8 S (sulfur) | 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) H (hydrogen) | 8 | 1.008 N (nitrogen) | 2 | 14.007 O (oxygen) | 8 | 15.999 S (sulfur) | 2 | 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) H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 8 | 15.999 | 8 × 15.999 = 127.992 S (sulfur) | 2 | 32.06 | 2 × 32.06 = 64.12 M = 8.064 g/mol + 28.014 g/mol + 127.992 g/mol + 64.12 g/mol = 228.19 g/mol](../image_source/820731522e0f7a65cccdc3da6cb1628a.png)
Find the molar mass, M, for ammonium persulfate: 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: (NH_4)_2S_2O_8 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 8 N (nitrogen) | 2 O (oxygen) | 8 S (sulfur) | 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) H (hydrogen) | 8 | 1.008 N (nitrogen) | 2 | 14.007 O (oxygen) | 8 | 15.999 S (sulfur) | 2 | 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) H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 8 | 15.999 | 8 × 15.999 = 127.992 S (sulfur) | 2 | 32.06 | 2 × 32.06 = 64.12 M = 8.064 g/mol + 28.014 g/mol + 127.992 g/mol + 64.12 g/mol = 228.19 g/mol
Unit conversion
![0.2282 kg/mol (kilograms per mole)](../image_source/cf4b29bb4daf24189e9c262d6d30fab7.png)
0.2282 kg/mol (kilograms per mole)
Comparisons
![≈ 0.32 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/7591f0e172cc8700e86549c7cda571d9.png)
≈ 0.32 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.2 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/0e1280f10564a6ce7252e5f9a319dcd5.png)
≈ 1.2 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 3.9 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/671861d22258e2c1296ea75dda105476.png)
≈ 3.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.8×10^-22 grams | 3.8×10^-25 kg (kilograms) | 228 u (unified atomic mass units) | 228 Da (daltons)](../image_source/f2171aaa6137307b681455d92af63f23.png)
Mass of a molecule m from m = M/N_A: | 3.8×10^-22 grams | 3.8×10^-25 kg (kilograms) | 228 u (unified atomic mass units) | 228 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 228](../image_source/a5d328a5f06684ffa6ea944538735d85.png)
Relative molecular mass M_r from M_r = M_u/M: | 228