Input interpretation
![4, 4'-dibromobenzophenone | molar mass](../image_source/df43bf5efb3b6f184bd3f963fb5b255d.png)
4, 4'-dibromobenzophenone | molar mass
Result
![Find the molar mass, M, for 4, 4'-dibromobenzophenone: 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_4)_2CO Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 13 H (hydrogen) | 8 O (oxygen) | 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) Br (bromine) | 2 | 79.904 C (carbon) | 13 | 12.011 H (hydrogen) | 8 | 1.008 O (oxygen) | 1 | 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) | 13 | 12.011 | 13 × 12.011 = 156.143 H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 M = 159.808 g/mol + 156.143 g/mol + 8.064 g/mol + 15.999 g/mol = 340.014 g/mol](../image_source/ca94633e2655874da2e87fbb030a1640.png)
Find the molar mass, M, for 4, 4'-dibromobenzophenone: 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_4)_2CO Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 13 H (hydrogen) | 8 O (oxygen) | 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) Br (bromine) | 2 | 79.904 C (carbon) | 13 | 12.011 H (hydrogen) | 8 | 1.008 O (oxygen) | 1 | 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) | 13 | 12.011 | 13 × 12.011 = 156.143 H (hydrogen) | 8 | 1.008 | 8 × 1.008 = 8.064 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 M = 159.808 g/mol + 156.143 g/mol + 8.064 g/mol + 15.999 g/mol = 340.014 g/mol
Unit conversion
![0.34001 kg/mol (kilograms per mole)](../image_source/2ef678adc5ea1856f7d7077c3841a429.png)
0.34001 kg/mol (kilograms per mole)
Comparisons
![≈ 0.47 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/c558af607f9940f591ab5137d1651fcb.png)
≈ 0.47 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.8 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/109a503b45137c0c59b241cb8d6d6532.png)
≈ 1.8 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 5.8 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/69078150147060d1cf815a3c73fa6008.png)
≈ 5.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 5.6×10^-22 grams | 5.6×10^-25 kg (kilograms) | 340 u (unified atomic mass units) | 340 Da (daltons)](../image_source/e9c4ad07f77e960cd36c1cf876034a2f.png)
Mass of a molecule m from m = M/N_A: | 5.6×10^-22 grams | 5.6×10^-25 kg (kilograms) | 340 u (unified atomic mass units) | 340 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 340](../image_source/22a12cbeda474b8576cef961a2e77595.png)
Relative molecular mass M_r from M_r = M_u/M: | 340