Input interpretation
mercury(I) sulfate | molar mass
Result
Find the molar mass, M, for mercury(I) sulfate: 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: Hg_2SO_4 Use the chemical formula, Hg_2SO_4, to count the number of atoms, N_i, for each element: | N_i Hg (mercury) | 2 O (oxygen) | 4 S (sulfur) | 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) Hg (mercury) | 2 | 200.592 O (oxygen) | 4 | 15.999 S (sulfur) | 1 | 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) Hg (mercury) | 2 | 200.592 | 2 × 200.592 = 401.184 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 401.184 g/mol + 63.996 g/mol + 32.06 g/mol = 497.24 g/mol
Unit conversion
0.49724 kg/mol (kilograms per mole)
Comparisons
≈ 0.69 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 2.6 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 8.5 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 8.3×10^-22 grams | 8.3×10^-25 kg (kilograms) | 497 u (unified atomic mass units) | 497 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 497