Input interpretation
1, 3, 5-trimethyl-1, 1, 3, 5, 5-pentaphenyltrisiloxane | molar mass
Result
Find the molar mass, M, for 1, 3, 5-trimethyl-1, 1, 3, 5, 5-pentaphenyltrisiloxane: 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_33H_34O_2Si_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 33 H (hydrogen) | 34 O (oxygen) | 2 Si (silicon) | 3 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) C (carbon) | 33 | 12.011 H (hydrogen) | 34 | 1.008 O (oxygen) | 2 | 15.999 Si (silicon) | 3 | 28.085 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) C (carbon) | 33 | 12.011 | 33 × 12.011 = 396.363 H (hydrogen) | 34 | 1.008 | 34 × 1.008 = 34.272 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 Si (silicon) | 3 | 28.085 | 3 × 28.085 = 84.255 M = 396.363 g/mol + 34.272 g/mol + 31.998 g/mol + 84.255 g/mol = 546.888 g/mol
Unit conversion
0.54689 kg/mol (kilograms per mole)
Comparisons
≈ 0.76 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 2.8 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 9.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 9.1×10^-22 grams | 9.1×10^-25 kg (kilograms) | 547 u (unified atomic mass units) | 547 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 547