Input interpretation
di-tert-butyl(methyl)phosphonium tetrafluoroborate | molar mass
Result
Find the molar mass, M, for di-tert-butyl(methyl)phosphonium tetrafluoroborate: 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: C_9H_22BF_4P Use the chemical formula to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 4 B (boron) | 1 C (carbon) | 9 P (phosphorus) | 1 H (hydrogen) | 22 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) F (fluorine) | 4 | 18.998403163 B (boron) | 1 | 10.81 C (carbon) | 9 | 12.011 P (phosphorus) | 1 | 30.973761998 H (hydrogen) | 22 | 1.008 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) F (fluorine) | 4 | 18.998403163 | 4 × 18.998403163 = 75.993612652 B (boron) | 1 | 10.81 | 1 × 10.81 = 10.81 C (carbon) | 9 | 12.011 | 9 × 12.011 = 108.099 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 H (hydrogen) | 22 | 1.008 | 22 × 1.008 = 22.176 M = 75.993612652 g/mol + 10.81 g/mol + 108.099 g/mol + 30.973761998 g/mol + 22.176 g/mol = 248.05 g/mol
Unit conversion
0.248 kg/mol (kilograms per mole)
Comparisons
≈ 0.34 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 4.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 4.1×10^-22 grams | 4.1×10^-25 kg (kilograms) | 248 u (unified atomic mass units) | 248 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 248