Input interpretation
![(R)-(+)-methyl p-tolyl sulfoxide | molar mass](../image_source/432f41e418d40c4b8ad0d84c4338ba80.png)
(R)-(+)-methyl p-tolyl sulfoxide | molar mass
Result
![Find the molar mass, M, for (R)-(+)-methyl p-tolyl sulfoxide: 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: CH_3C_6H_4S(O)CH_3 Use the chemical formula, CH_3C_6H_4S(O)CH_3, to count the number of atoms, N_i, for each element: | N_i C (carbon) | 8 H (hydrogen) | 10 O (oxygen) | 1 S (sulfur) | 1 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) C (carbon) | 8 | 12.011 H (hydrogen) | 10 | 1.008 O (oxygen) | 1 | 15.999 S (sulfur) | 1 | 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) C (carbon) | 8 | 12.011 | 8 × 12.011 = 96.088 H (hydrogen) | 10 | 1.008 | 10 × 1.008 = 10.080 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 96.088 g/mol + 10.080 g/mol + 15.999 g/mol + 32.06 g/mol = 154.23 g/mol](../image_source/94bb1b3efc545dc076ae7e904b23cbb8.png)
Find the molar mass, M, for (R)-(+)-methyl p-tolyl sulfoxide: 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: CH_3C_6H_4S(O)CH_3 Use the chemical formula, CH_3C_6H_4S(O)CH_3, to count the number of atoms, N_i, for each element: | N_i C (carbon) | 8 H (hydrogen) | 10 O (oxygen) | 1 S (sulfur) | 1 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) C (carbon) | 8 | 12.011 H (hydrogen) | 10 | 1.008 O (oxygen) | 1 | 15.999 S (sulfur) | 1 | 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) C (carbon) | 8 | 12.011 | 8 × 12.011 = 96.088 H (hydrogen) | 10 | 1.008 | 10 × 1.008 = 10.080 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 96.088 g/mol + 10.080 g/mol + 15.999 g/mol + 32.06 g/mol = 154.23 g/mol
Unit conversion
![0.1542 kg/mol (kilograms per mole)](../image_source/ae240fe9de998aaaccf0e0bf2633ad2e.png)
0.1542 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.21 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/15cfafa55be8304f09da7aa2e5881bc5.png)
≈ ( 0.21 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.79 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/80dc80cb5d0080e593dab0793a5b3f6c.png)
≈ 0.79 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.6 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/7cd8c1109241ba5269e29562f9898899.png)
≈ 2.6 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.6×10^-22 grams | 2.6×10^-25 kg (kilograms) | 154 u (unified atomic mass units) | 154 Da (daltons)](../image_source/eb6b9b36408e6bf9b9b345945235e588.png)
Mass of a molecule m from m = M/N_A: | 2.6×10^-22 grams | 2.6×10^-25 kg (kilograms) | 154 u (unified atomic mass units) | 154 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 154](../image_source/9011f959c0c63e5afdac0c637fad5e26.png)
Relative molecular mass M_r from M_r = M_u/M: | 154