Input interpretation
![11-bromoundecanoic acid | molar mass](../image_source/a252de3fdace8af840506d6367e7205a.png)
11-bromoundecanoic acid | molar mass
Result
![Find the molar mass, M, for 11-bromoundecanoic acid: 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: Br(CH_2)_10COOH Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 1 C (carbon) | 11 H (hydrogen) | 21 O (oxygen) | 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) Br (bromine) | 1 | 79.904 C (carbon) | 11 | 12.011 H (hydrogen) | 21 | 1.008 O (oxygen) | 2 | 15.999 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) Br (bromine) | 1 | 79.904 | 1 × 79.904 = 79.904 C (carbon) | 11 | 12.011 | 11 × 12.011 = 132.121 H (hydrogen) | 21 | 1.008 | 21 × 1.008 = 21.168 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 79.904 g/mol + 132.121 g/mol + 21.168 g/mol + 31.998 g/mol = 265.191 g/mol](../image_source/a5e3bd8d418ff9acc441bfd51e513e24.png)
Find the molar mass, M, for 11-bromoundecanoic acid: 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: Br(CH_2)_10COOH Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 1 C (carbon) | 11 H (hydrogen) | 21 O (oxygen) | 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) Br (bromine) | 1 | 79.904 C (carbon) | 11 | 12.011 H (hydrogen) | 21 | 1.008 O (oxygen) | 2 | 15.999 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) Br (bromine) | 1 | 79.904 | 1 × 79.904 = 79.904 C (carbon) | 11 | 12.011 | 11 × 12.011 = 132.121 H (hydrogen) | 21 | 1.008 | 21 × 1.008 = 21.168 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 79.904 g/mol + 132.121 g/mol + 21.168 g/mol + 31.998 g/mol = 265.191 g/mol
Unit conversion
![0.26519 kg/mol (kilograms per mole)](../image_source/c48330dba7364c09ec27e2b631024e96.png)
0.26519 kg/mol (kilograms per mole)
Comparisons
![≈ 0.37 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/202d7dc5efb01823be6d8323f1a05888.png)
≈ 0.37 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.4 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/6a61297d2cd59c087ccb5e8b9abfbdbf.png)
≈ 1.4 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 4.5 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/04bcbea0539f42799f6383fce8a2c938.png)
≈ 4.5 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 4.4×10^-22 grams | 4.4×10^-25 kg (kilograms) | 265 u (unified atomic mass units) | 265 Da (daltons)](../image_source/e5cc742e71f027ff89e2b3d5eeaf7580.png)
Mass of a molecule m from m = M/N_A: | 4.4×10^-22 grams | 4.4×10^-25 kg (kilograms) | 265 u (unified atomic mass units) | 265 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 265](../image_source/25c4f15ecd703657328d01f49865a065.png)
Relative molecular mass M_r from M_r = M_u/M: | 265