Input interpretation
copper(II) phthalocyanine | molar mass
Result
Find the molar mass, M, for copper(II) phthalocyanine: 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_32H_16CuN_8 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 32 Cu (copper) | 1 H (hydrogen) | 16 N (nitrogen) | 8 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) | 32 | 12.011 Cu (copper) | 1 | 63.546 H (hydrogen) | 16 | 1.008 N (nitrogen) | 8 | 14.007 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) | 32 | 12.011 | 32 × 12.011 = 384.352 Cu (copper) | 1 | 63.546 | 1 × 63.546 = 63.546 H (hydrogen) | 16 | 1.008 | 16 × 1.008 = 16.128 N (nitrogen) | 8 | 14.007 | 8 × 14.007 = 112.056 M = 384.352 g/mol + 63.546 g/mol + 16.128 g/mol + 112.056 g/mol = 576.082 g/mol
Unit conversion
0.57608 kg/mol (kilograms per mole)
Comparisons
≈ 0.8 × molar mass of fullerene ( ≈ 721 g/mol )
≈ 3 × molar mass of caffeine ( ≈ 194 g/mol )
≈ 9.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 9.6×10^-22 grams | 9.6×10^-25 kg (kilograms) | 576 u (unified atomic mass units) | 576 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 576