Input interpretation
![copper(I) sulfite hemihydrate | molar mass](../image_source/4b1b7ba6118aff3d0a7d38ecbc79f938.png)
copper(I) sulfite hemihydrate | molar mass
Result
![Find the molar mass, M, for copper(I) sulfite hemihydrate: 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: Cu_2SO_3·0.5H_2O Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cu (copper) | 4 H (hydrogen) | 2 O (oxygen) | 7 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) Cu (copper) | 4 | 63.546 H (hydrogen) | 2 | 1.008 O (oxygen) | 7 | 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) Cu (copper) | 4 | 63.546 | 4 × 63.546 = 254.184 H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 7 | 15.999 | 7 × 15.999 = 111.993 S (sulfur) | 2 | 32.06 | 2 × 32.06 = 64.12 M = 254.184 g/mol + 2.016 g/mol + 111.993 g/mol + 64.12 g/mol = 432.31 g/mol](../image_source/dc710ae0b4f56c0e8a0acba9dd9c3a5c.png)
Find the molar mass, M, for copper(I) sulfite hemihydrate: 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: Cu_2SO_3·0.5H_2O Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cu (copper) | 4 H (hydrogen) | 2 O (oxygen) | 7 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) Cu (copper) | 4 | 63.546 H (hydrogen) | 2 | 1.008 O (oxygen) | 7 | 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) Cu (copper) | 4 | 63.546 | 4 × 63.546 = 254.184 H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 7 | 15.999 | 7 × 15.999 = 111.993 S (sulfur) | 2 | 32.06 | 2 × 32.06 = 64.12 M = 254.184 g/mol + 2.016 g/mol + 111.993 g/mol + 64.12 g/mol = 432.31 g/mol
Unit conversion
![0.4323 kg/mol (kilograms per mole)](../image_source/c28469bec0570640a5a798192c8d0388.png)
0.4323 kg/mol (kilograms per mole)
Comparisons
![≈ 0.6 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/1fc3995f92b6d42dc313bd68bc7a1b10.png)
≈ 0.6 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 2.2 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/949610ac02cae8aa4af9852f4b994aa4.png)
≈ 2.2 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 7.4 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/4f8f9b038bcf10cae3606d7fd024ed61.png)
≈ 7.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 7.2×10^-22 grams | 7.2×10^-25 kg (kilograms) | 432 u (unified atomic mass units) | 432 Da (daltons)](../image_source/9ebb8e31956be951f4c6ae6b70122b0c.png)
Mass of a molecule m from m = M/N_A: | 7.2×10^-22 grams | 7.2×10^-25 kg (kilograms) | 432 u (unified atomic mass units) | 432 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 432](../image_source/7851279f6fe1348c166f325e32dbbfb3.png)
Relative molecular mass M_r from M_r = M_u/M: | 432