Input interpretation
![bromine | molar mass](../image_source/e2e1f0bd9f80d8172779a11375860b17.png)
bromine | molar mass
Result
![Find the molar mass, M, for bromine: 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: Br_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 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) Br (bromine) | 2 | 79.904 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) | 2 | 79.904 | 2 × 79.904 = 159.808 M = 159.808 g/mol](../image_source/dd0cb038a9ab459e1150bcefc288961b.png)
Find the molar mass, M, for bromine: 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: Br_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 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) Br (bromine) | 2 | 79.904 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) | 2 | 79.904 | 2 × 79.904 = 159.808 M = 159.808 g/mol
Unit conversion
![0.15981 kg/mol (kilograms per mole)](../image_source/74fad65459d7dc9a6991846dbf60ade5.png)
0.15981 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.22 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/4d0d95ef148a19947a83ed328d7bab11.png)
≈ ( 0.22 ≈ 1/5 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.82 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/7aff5e08cca978dbd94cc4cfba083eb1.png)
≈ 0.82 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.7 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/567d526ced165129df72252cf71a7265.png)
≈ 2.7 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.7×10^-22 grams | 2.7×10^-25 kg (kilograms) | 160 u (unified atomic mass units) | 160 Da (daltons)](../image_source/4aafd2ce4bfe1db018cfa51d3c715f51.png)
Mass of a molecule m from m = M/N_A: | 2.7×10^-22 grams | 2.7×10^-25 kg (kilograms) | 160 u (unified atomic mass units) | 160 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 160](../image_source/e6b90024c4e5eff08b88aa5a37616ecc.png)
Relative molecular mass M_r from M_r = M_u/M: | 160