Input interpretation
sodium hypophosphite hydrate | molar mass
Result
Find the molar mass, M, for sodium hypophosphite hydrate: 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: NaH_2PO_2·xH_2O Use the chemical formula, NaH_2PO_2·xH_2O, to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 4 Na (sodium) | 1 O (oxygen) | 3 P (phosphorus) | 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) H (hydrogen) | 4 | 1.008 Na (sodium) | 1 | 22.98976928 O (oxygen) | 3 | 15.999 P (phosphorus) | 1 | 30.973761998 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) H (hydrogen) | 4 | 1.008 | 4 × 1.008 = 4.032 Na (sodium) | 1 | 22.98976928 | 1 × 22.98976928 = 22.98976928 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 4.032 g/mol + 22.98976928 g/mol + 47.997 g/mol + 30.973761998 g/mol = 105.993 g/mol
Unit conversion
0.10599 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.15 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )
≈ 0.55 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 1.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 1.8×10^-22 grams | 1.8×10^-25 kg (kilograms) | 106 u (unified atomic mass units) | 106 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 106