Input interpretation
1, 1, 2, 2-tetrafluoroethane | molecular mass
Result
Find the molecular mass, m, for 1, 1, 2, 2-tetrafluoroethane: 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_2H_2F_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 F (fluorine) | 4 H (hydrogen) | 2 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) | 2 | 12.011 F (fluorine) | 4 | 18.998403163 H (hydrogen) | 2 | 1.008 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) | 2 | 12.011 | 2 × 12.011 = 24.022 F (fluorine) | 4 | 18.998403163 | 4 × 18.998403163 = 75.993612652 H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 m = 24.022 u + 75.993612652 u + 2.016 u = 102.032 u
Unit conversions
102.03 Da (daltons)
0.10203 kDa (kilodaltons)
1.6943×10^-22 grams
1.6943×10^-25 kg (kilograms)
102.04 chemical atomic mass units (unit officially deprecated)
102.06 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
≈ ( 0.14 ≈ 1/7 ) × molecular mass of fullerene ( ≈ 721 u )
≈ 0.53 × molecular mass of caffeine ( ≈ 194 u )
≈ 1.7 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 102
Molar mass M from M = m_aN_A: | 102 g/mol (grams per mole)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 102
Molar mass M from M = m_mN_A: | 102 g/mol (grams per mole)