Input interpretation
potassium chloroplatinate | molar mass
Result
Find the molar mass, M, for potassium chloroplatinate: 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: K_2PtCl_6 Use the chemical formula, K_2PtCl_6, to count the number of atoms, N_i, for each element: | N_i Cl (chlorine) | 6 K (potassium) | 2 Pt (platinum) | 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) | 6 | 35.45 K (potassium) | 2 | 39.0983 Pt (platinum) | 1 | 195.084 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) | 6 | 35.45 | 6 × 35.45 = 212.70 K (potassium) | 2 | 39.0983 | 2 × 39.0983 = 78.1966 Pt (platinum) | 1 | 195.084 | 1 × 195.084 = 195.084 M = 212.70 g/mol + 78.1966 g/mol + 195.084 g/mol = 485.98 g/mol
Unit conversion
0.486 kg/mol (kilograms per mole)
Comparisons
≈ 0.67 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 2.5 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 8.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 8.1×10^-22 grams | 8.1×10^-25 kg (kilograms) | 486 u (unified atomic mass units) | 486 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 486