molecular mass of enfuvirtide

enfuvirtide | molecular mass

Find the molecular mass, m, for enfuvirtide: 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_204H_301N_51O_64 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 204 H (hydrogen) | 301 N (nitrogen) | 51 O (oxygen) | 64 Look up the atomic mass, m_i, in unified atomic mass units, u, for each element in the periodic table: | N_i | m_i/u C (carbon) | 204 | 12.011 H (hydrogen) | 301 | 1.008 N (nitrogen) | 51 | 14.007 O (oxygen) | 64 | 15.999 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molecular mass, m: Answer: | | | N_i | m_i/u | mass/u C (carbon) | 204 | 12.011 | 204 × 12.011 = 2450.244 H (hydrogen) | 301 | 1.008 | 301 × 1.008 = 303.408 N (nitrogen) | 51 | 14.007 | 51 × 14.007 = 714.357 O (oxygen) | 64 | 15.999 | 64 × 15.999 = 1023.936 m = 2450.244 u + 303.408 u + 714.357 u + 1023.936 u = 4491.945 u

4.4919 kDa (kilodaltons)

4491.9 Da (daltons)

7.459×10^-21 grams

7.459×10^-24 kg (kilograms)

4492.1 chemical atomic mass units (unit officially deprecated)

4493.4 physical atomic mass units (unit officially deprecated)

≈ 6.2 × molecular mass of fullerene ( ≈ 721 u )

≈ 23 × molecular mass of caffeine ( ≈ 194 u )

≈ 77 × molecular mass of sodium chloride ( ≈ 58 u )

Relative atomic mass A_r from A_r = m_aN_A/M_u: | 4492

Relative molecular mass M_r from M_r = m_mN_A/M_u: | 4492