Input interpretation
![9, 9-didodecyl-2, 7-dibromofluorene | molar mass](../image_source/27715bb2a4ddbaaeb31e776c11174e48.png)
9, 9-didodecyl-2, 7-dibromofluorene | molar mass
Result
![Find the molar mass, M, for 9, 9-didodecyl-2, 7-dibromofluorene: 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: C_37H_56Br_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 37 H (hydrogen) | 56 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) | 37 | 12.011 H (hydrogen) | 56 | 1.008 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) | 37 | 12.011 | 37 × 12.011 = 444.407 H (hydrogen) | 56 | 1.008 | 56 × 1.008 = 56.448 M = 159.808 g/mol + 444.407 g/mol + 56.448 g/mol = 660.663 g/mol](../image_source/b7b26fc5fc82a46ed6110480e0d65ab9.png)
Find the molar mass, M, for 9, 9-didodecyl-2, 7-dibromofluorene: 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: C_37H_56Br_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 37 H (hydrogen) | 56 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) | 37 | 12.011 H (hydrogen) | 56 | 1.008 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) | 37 | 12.011 | 37 × 12.011 = 444.407 H (hydrogen) | 56 | 1.008 | 56 × 1.008 = 56.448 M = 159.808 g/mol + 444.407 g/mol + 56.448 g/mol = 660.663 g/mol
Unit conversion
![0.6607 kg/mol (kilograms per mole)](../image_source/8cd5e42d88f77d862a0591629ea6e375.png)
0.6607 kg/mol (kilograms per mole)
Comparisons
![≈ 0.92 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/2d531455ac941f083f07f43bea368153.png)
≈ 0.92 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 3.4 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/a93bb4300af77a0ca2ef1c61d34af57b.png)
≈ 3.4 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 11 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/840d5b9be751c4367d6fc4436a1e80f6.png)
≈ 11 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.1×10^-21 grams | 1.1×10^-24 kg (kilograms) | 661 u (unified atomic mass units) | 661 Da (daltons)](../image_source/3c366a92014add54c3ac5f917276e990.png)
Mass of a molecule m from m = M/N_A: | 1.1×10^-21 grams | 1.1×10^-24 kg (kilograms) | 661 u (unified atomic mass units) | 661 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 661](../image_source/a6d50ce2285591ef7aa60ccb45eac8f7.png)
Relative molecular mass M_r from M_r = M_u/M: | 661