Input interpretation
nickel(II) chloride | molar mass
Result
Find the molar mass, M, for nickel(II) chloride: 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: NiCl_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cl (chlorine) | 2 Ni (nickel) | 1 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) Cl (chlorine) | 2 | 35.45 Ni (nickel) | 1 | 58.6934 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) Cl (chlorine) | 2 | 35.45 | 2 × 35.45 = 70.90 Ni (nickel) | 1 | 58.6934 | 1 × 58.6934 = 58.6934 M = 70.90 g/mol + 58.6934 g/mol = 129.59 g/mol
Unit conversion
0.1296 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.18 ≈ 1/6 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.67 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 2.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 2.2×10^-22 grams | 2.2×10^-25 kg (kilograms) | 130 u (unified atomic mass units) | 130 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 130