Input interpretation
![4, 4'-dibromobenzil | molar mass](../image_source/070616a717085a0b7f6e79623de8d2ea.png)
4, 4'-dibromobenzil | molar mass
Result
![Find the molar mass, M, for 4, 4'-dibromobenzil: 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: BrC_6H_4COCOC_6H_4Br Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 14 H (hydrogen) | 8 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) | 2 | 79.904 C (carbon) | 14 | 12.011 H (hydrogen) | 8 | 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) | 2 | 79.904 | 2 × 79.904 = 159.808 C (carbon) | 14 | 12.011 | 14 × 12.011 = 168.154 H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 159.808 g/mol + 168.154 g/mol + 8.064 g/mol + 31.998 g/mol = 368.024 g/mol](../image_source/3b57605bd5811e958aee227b85384d6c.png)
Find the molar mass, M, for 4, 4'-dibromobenzil: 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: BrC_6H_4COCOC_6H_4Br Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 14 H (hydrogen) | 8 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) | 2 | 79.904 C (carbon) | 14 | 12.011 H (hydrogen) | 8 | 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) | 2 | 79.904 | 2 × 79.904 = 159.808 C (carbon) | 14 | 12.011 | 14 × 12.011 = 168.154 H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 159.808 g/mol + 168.154 g/mol + 8.064 g/mol + 31.998 g/mol = 368.024 g/mol
Unit conversion
![0.36802 kg/mol (kilograms per mole)](../image_source/6c412fa11563ea3eca1b8185d913003c.png)
0.36802 kg/mol (kilograms per mole)
Comparisons
![≈ 0.51 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/23f6282228ae3b4e267f7f2da0453906.png)
≈ 0.51 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.9 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/ddbd4166946f48fd50c5c8137c2a3613.png)
≈ 1.9 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 6.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/c509f1916be048f14c3f07cab99f3e9a.png)
≈ 6.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 6.1×10^-22 grams | 6.1×10^-25 kg (kilograms) | 368 u (unified atomic mass units) | 368 Da (daltons)](../image_source/86f4f4d973294f09c6e09a1447f848c0.png)
Mass of a molecule m from m = M/N_A: | 6.1×10^-22 grams | 6.1×10^-25 kg (kilograms) | 368 u (unified atomic mass units) | 368 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 368](../image_source/455d7beaa60c1b1280c43fc8f71aacaf.png)
Relative molecular mass M_r from M_r = M_u/M: | 368