Input interpretation
europium(II) fluoride | molar mass
Result
Find the molar mass, M, for europium(II) 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: EuF_2 Use the chemical formula, EuF_2, to count the number of atoms, N_i, for each element: | N_i Eu (europium) | 1 F (fluorine) | 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) Eu (europium) | 1 | 151.964 F (fluorine) | 2 | 18.998403163 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) Eu (europium) | 1 | 151.964 | 1 × 151.964 = 151.964 F (fluorine) | 2 | 18.998403163 | 2 × 18.998403163 = 37.996806326 M = 151.964 g/mol + 37.996806326 g/mol = 189.961 g/mol
Unit conversion
0.189961 kg/mol (kilograms per mole)
Comparisons
≈ 0.26 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.98 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 3.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 3.2×10^-22 grams | 3.2×10^-25 kg (kilograms) | 190 u (unified atomic mass units) | 190 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 190