molar mass of tetrabromobisphenol A

tetrabromobisphenol A | molar mass

Find the molar mass, M, for tetrabromobisphenol A: 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_3)_2C[C_6H_2(Br)_2OH]_2 Use the chemical formula, (CH_3)_2C[C_6H_2(Br)_2OH]_2, to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 4 C (carbon) | 15 H (hydrogen) | 12 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) | 4 | 79.904 C (carbon) | 15 | 12.011 H (hydrogen) | 12 | 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) | 4 | 79.904 | 4 × 79.904 = 319.616 C (carbon) | 15 | 12.011 | 15 × 12.011 = 180.165 H (hydrogen) | 12 | 1.008 | 12 × 1.008 = 12.096 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 319.616 g/mol + 180.165 g/mol + 12.096 g/mol + 31.998 g/mol = 543.875 g/mol

0.54387 kg/mol (kilograms per mole)

≈ 0.75 × molar mass of fullerene ( ≈ 721 g/mol )

≈ 2.8 × molar mass of caffeine ( ≈ 194 g/mol )

≈ 9.3 × molar mass of sodium chloride ( ≈ 58 g/mol )

Mass of a molecule m from m = M/N_A: | 9×10^-22 grams | 9×10^-25 kg (kilograms) | 544 u (unified atomic mass units) | 544 Da (daltons)

Relative molecular mass M_r from M_r = M_u/M: | 544