Input interpretation
![tetraethylphosphonium bromide | molar mass](../image_source/62cdc4a681307e05144d5390148c6a5a.png)
tetraethylphosphonium bromide | molar mass
Result
![Find the molar mass, M, for tetraethylphosphonium bromide: 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: (CH_3CH_2)_4P(Br) Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 1 C (carbon) | 8 H (hydrogen) | 20 P (phosphorus) | 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) Br (bromine) | 1 | 79.904 C (carbon) | 8 | 12.011 H (hydrogen) | 20 | 1.008 P (phosphorus) | 1 | 30.973761998 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) Br (bromine) | 1 | 79.904 | 1 × 79.904 = 79.904 C (carbon) | 8 | 12.011 | 8 × 12.011 = 96.088 H (hydrogen) | 20 | 1.008 | 20 × 1.008 = 20.160 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 79.904 g/mol + 96.088 g/mol + 20.160 g/mol + 30.973761998 g/mol = 227.126 g/mol](../image_source/17b5656c31166abe797de4769a8f93ac.png)
Find the molar mass, M, for tetraethylphosphonium bromide: 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: (CH_3CH_2)_4P(Br) Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 1 C (carbon) | 8 H (hydrogen) | 20 P (phosphorus) | 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) Br (bromine) | 1 | 79.904 C (carbon) | 8 | 12.011 H (hydrogen) | 20 | 1.008 P (phosphorus) | 1 | 30.973761998 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) Br (bromine) | 1 | 79.904 | 1 × 79.904 = 79.904 C (carbon) | 8 | 12.011 | 8 × 12.011 = 96.088 H (hydrogen) | 20 | 1.008 | 20 × 1.008 = 20.160 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 79.904 g/mol + 96.088 g/mol + 20.160 g/mol + 30.973761998 g/mol = 227.126 g/mol
Unit conversion
![0.22713 kg/mol (kilograms per mole)](../image_source/2f3000ad21c463cc9f0d4278f1418dfb.png)
0.22713 kg/mol (kilograms per mole)
Comparisons
![≈ 0.32 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/28a5804c21da56bfc21267d887f9d833.png)
≈ 0.32 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.2 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/fc9d781bde021fbd5544455ea6e2f6d0.png)
≈ 1.2 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 3.9 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/1afed78baa18e518f7d46b8ed0afb93e.png)
≈ 3.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.8×10^-22 grams | 3.8×10^-25 kg (kilograms) | 227 u (unified atomic mass units) | 227 Da (daltons)](../image_source/cec0e877438ab570ecea64efc9fa7b76.png)
Mass of a molecule m from m = M/N_A: | 3.8×10^-22 grams | 3.8×10^-25 kg (kilograms) | 227 u (unified atomic mass units) | 227 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 227](../image_source/bd1893fe1af9d10bd006739c4b0da8fd.png)
Relative molecular mass M_r from M_r = M_u/M: | 227