Input interpretation
zinc fluoride | molecular mass
Result
Find the molecular mass, m, for zinc fluoride: 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: ZnF_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 2 Zn (zinc) | 1 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 F (fluorine) | 2 | 18.998403163 Zn (zinc) | 1 | 65.38 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 F (fluorine) | 2 | 18.998403163 | 2 × 18.998403163 = 37.996806326 Zn (zinc) | 1 | 65.38 | 1 × 65.38 = 65.38 m = 37.996806326 u + 65.38 u = 103.38 u
Unit conversions
103.4 Da (daltons)
0.1034 kDa (kilodaltons)
1.717×10^-22 grams
1.717×10^-25 kg (kilograms)
103.4 chemical atomic mass units (unit officially deprecated)
103.4 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 )
≈ 1.8 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 103
Molar mass M from M = m_aN_A: | 103 g/mol (grams per mole)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 103
Molar mass M from M = m_mN_A: | 103 g/mol (grams per mole)