Input interpretation
![selenious acid | molar mass](../image_source/fcf01359b08d1c671485b30adef77795.png)
selenious acid | molar mass
Result
![Find the molar mass, M, for selenious acid: 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: H_2SeO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 2 O (oxygen) | 3 Se (selenium) | 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) H (hydrogen) | 2 | 1.008 O (oxygen) | 3 | 15.999 Se (selenium) | 1 | 78.971 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) H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 M = 2.016 g/mol + 47.997 g/mol + 78.971 g/mol = 128.984 g/mol](../image_source/0b09e44d3cc7764de6bb94c95b47adf6.png)
Find the molar mass, M, for selenious acid: 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: H_2SeO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 2 O (oxygen) | 3 Se (selenium) | 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) H (hydrogen) | 2 | 1.008 O (oxygen) | 3 | 15.999 Se (selenium) | 1 | 78.971 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) H (hydrogen) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 M = 2.016 g/mol + 47.997 g/mol + 78.971 g/mol = 128.984 g/mol
Unit conversion
![0.12898 kg/mol (kilograms per mole)](../image_source/d9e423a444f55ff8b870568292c3d003.png)
0.12898 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.18 ≈ 1/6 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/9ca5ced643e09f00776b482c8577066b.png)
≈ ( 0.18 ≈ 1/6 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.66 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/5274912af15504db49bfa41aab15a37a.png)
≈ 0.66 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.2 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/66e3b8a2dee6806dc304f763151a9adc.png)
≈ 2.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.1×10^-22 grams | 2.1×10^-25 kg (kilograms) | 129 u (unified atomic mass units) | 129 Da (daltons)](../image_source/9c4c8c5f6dc9e485c4f51cb254dfebbd.png)
Mass of a molecule m from m = M/N_A: | 2.1×10^-22 grams | 2.1×10^-25 kg (kilograms) | 129 u (unified atomic mass units) | 129 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 129](../image_source/fdbb365e4d929c958520abb9bc07eba3.png)
Relative molecular mass M_r from M_r = M_u/M: | 129