Input interpretation
platinum(IV) sulfide | molar mass
Result
Find the molar mass, M, for platinum(IV) sulfide: 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: PtS_2 Use the chemical formula, PtS_2, to count the number of atoms, N_i, for each element: | N_i Pt (platinum) | 1 S (sulfur) | 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) Pt (platinum) | 1 | 195.084 S (sulfur) | 2 | 32.06 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) Pt (platinum) | 1 | 195.084 | 1 × 195.084 = 195.084 S (sulfur) | 2 | 32.06 | 2 × 32.06 = 64.12 M = 195.084 g/mol + 64.12 g/mol = 259.20 g/mol
Unit conversion
0.2592 kg/mol (kilograms per mole)
Comparisons
≈ 0.36 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 4.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 4.3×10^-22 grams | 4.3×10^-25 kg (kilograms) | 259 u (unified atomic mass units) | 259 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 259