Input interpretation
1, 5-diiodopentane | molar mass
Result
Find the molar mass, M, for 1, 5-diiodopentane: 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: I(CH_2)_5I Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 5 H (hydrogen) | 10 I (iodine) | 2 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) | 5 | 12.011 H (hydrogen) | 10 | 1.008 I (iodine) | 2 | 126.90447 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) | 5 | 12.011 | 5 × 12.011 = 60.055 H (hydrogen) | 10 | 1.008 | 10 × 1.008 = 10.080 I (iodine) | 2 | 126.90447 | 2 × 126.90447 = 253.80894 M = 60.055 g/mol + 10.080 g/mol + 253.80894 g/mol = 323.944 g/mol
Unit conversion
0.32394 kg/mol (kilograms per mole)
Comparisons
≈ 0.45 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 1.7 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 5.5 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 5.4×10^-22 grams | 5.4×10^-25 kg (kilograms) | 324 u (unified atomic mass units) | 324 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 324