molar mass of 1-[(trimethylsilyl)ethynyl]-4-(trifluoromethyl)benzene

1-[(trimethylsilyl)ethynyl]-4-(trifluoromethyl)benzene | molar mass

Find the molar mass, M, for 1-[(trimethylsilyl)ethynyl]-4-(trifluoromethyl)benzene: 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_6H_4CF_3C congruent CSi(CH_3)_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 12 F (fluorine) | 3 H (hydrogen) | 13 Si (silicon) | 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) C (carbon) | 12 | 12.011 F (fluorine) | 3 | 18.998403163 H (hydrogen) | 13 | 1.008 Si (silicon) | 1 | 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) | 12 | 12.011 | 12 × 12.011 = 144.132 F (fluorine) | 3 | 18.998403163 | 3 × 18.998403163 = 56.995209489 H (hydrogen) | 13 | 1.008 | 13 × 1.008 = 13.104 Si (silicon) | 1 | 28.085 | 1 × 28.085 = 28.085 M = 144.132 g/mol + 56.995209489 g/mol + 13.104 g/mol + 28.085 g/mol = 242.316 g/mol

0.24232 kg/mol (kilograms per mole)

≈ 0.34 × molar mass of fullerene ( ≈ 721 g/mol )

≈ 1.2 × molar mass of caffeine ( ≈ 194 g/mol )

≈ 4.1 × molar mass of sodium chloride ( ≈ 58 g/mol )

Mass of a molecule m from m = M/N_A: | 4×10^-22 grams | 4×10^-25 kg (kilograms) | 242 u (unified atomic mass units) | 242 Da (daltons)

Relative molecular mass M_r from M_r = M_u/M: | 242