Input interpretation
![barium hydroxide | molar mass](../image_source/ec2b664c34bdc375abaee8020ffa4e99.png)
barium hydroxide | molar mass
Result
![Find the molar mass, M, for barium hydroxide: 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: Ba(OH)_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Ba (barium) | 1 H (hydrogen) | 2 O (oxygen) | 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) Ba (barium) | 1 | 137.327 H (hydrogen) | 2 | 1.008 O (oxygen) | 2 | 15.999 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) Ba (barium) | 1 | 137.327 | 1 × 137.327 = 137.327 H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 137.327 g/mol + 2.016 g/mol + 31.998 g/mol = 171.341 g/mol](../image_source/584199cf9410d85d2acb3303a033a359.png)
Find the molar mass, M, for barium hydroxide: 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: Ba(OH)_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Ba (barium) | 1 H (hydrogen) | 2 O (oxygen) | 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) Ba (barium) | 1 | 137.327 H (hydrogen) | 2 | 1.008 O (oxygen) | 2 | 15.999 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) Ba (barium) | 1 | 137.327 | 1 × 137.327 = 137.327 H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 137.327 g/mol + 2.016 g/mol + 31.998 g/mol = 171.341 g/mol
Unit conversion
![0.17134 kg/mol (kilograms per mole)](../image_source/cd1273a7cafdaa8f99d310211d2d8e97.png)
0.17134 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.24 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/36c5f4b987aad863661b90247a5cf15f.png)
≈ ( 0.24 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.88 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/ce1c3a0da87977b35c02d1c5f69f7310.png)
≈ 0.88 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.9 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/58ca144320eb7bc01f21284ed0483403.png)
≈ 2.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.8×10^-22 grams | 2.8×10^-25 kg (kilograms) | 171 u (unified atomic mass units) | 171 Da (daltons)](../image_source/99dc594fc54d1faf88a3fe56487e0d37.png)
Mass of a molecule m from m = M/N_A: | 2.8×10^-22 grams | 2.8×10^-25 kg (kilograms) | 171 u (unified atomic mass units) | 171 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 171](../image_source/f566daf8a997c4b20b322c4b150407f3.png)
Relative molecular mass M_r from M_r = M_u/M: | 171