Input interpretation
![bromine trifluoride | molar mass](../image_source/83b08e5dc5f7c231c121a1f8aad8dc5f.png)
bromine trifluoride | molar mass
Result
![Find the molar mass, M, for bromine trifluoride: 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: BrF_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 1 F (fluorine) | 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) Br (bromine) | 1 | 79.904 F (fluorine) | 3 | 18.998403163 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 F (fluorine) | 3 | 18.998403163 | 3 × 18.998403163 = 56.995209489 M = 79.904 g/mol + 56.995209489 g/mol = 136.899 g/mol](../image_source/140af19a351958dfd3f88c006dcea2ef.png)
Find the molar mass, M, for bromine trifluoride: 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: BrF_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 1 F (fluorine) | 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) Br (bromine) | 1 | 79.904 F (fluorine) | 3 | 18.998403163 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 F (fluorine) | 3 | 18.998403163 | 3 × 18.998403163 = 56.995209489 M = 79.904 g/mol + 56.995209489 g/mol = 136.899 g/mol
Unit conversion
![0.1369 kg/mol (kilograms per mole)](../image_source/88653b8f3d9c0201258f0db0cc7dce59.png)
0.1369 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.19 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/a5f5c8a727da41bafac0ec1078382f39.png)
≈ ( 0.19 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.7 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/e4b9a65fd81f95fe3f9d4dc5028eec35.png)
≈ 0.7 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/2dc9f29703cf5ee3ae1af40fe4e735b2.png)
≈ 2.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.3×10^-22 grams | 2.3×10^-25 kg (kilograms) | 137 u (unified atomic mass units) | 137 Da (daltons)](../image_source/3abc9c866ee1a698af27944cb914fa3c.png)
Mass of a molecule m from m = M/N_A: | 2.3×10^-22 grams | 2.3×10^-25 kg (kilograms) | 137 u (unified atomic mass units) | 137 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 137](../image_source/7ce2a7e3865807b2990247aaee5b6fe6.png)
Relative molecular mass M_r from M_r = M_u/M: | 137