Input interpretation
![arsenic trioxide | molar mass](../image_source/b7cf532cef7792ecda9820766d5b83c0.png)
arsenic trioxide | molar mass
Result
![Find the molar mass, M, for arsenic trioxide: 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: As_2O_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i As (arsenic) | 2 O (oxygen) | 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) As (arsenic) | 2 | 74.921595 O (oxygen) | 3 | 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) As (arsenic) | 2 | 74.921595 | 2 × 74.921595 = 149.843190 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 M = 149.843190 g/mol + 47.997 g/mol = 197.840 g/mol](../image_source/f35f282572aa57ac8c43750a84081649.png)
Find the molar mass, M, for arsenic trioxide: 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: As_2O_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i As (arsenic) | 2 O (oxygen) | 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) As (arsenic) | 2 | 74.921595 O (oxygen) | 3 | 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) As (arsenic) | 2 | 74.921595 | 2 × 74.921595 = 149.843190 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 M = 149.843190 g/mol + 47.997 g/mol = 197.840 g/mol
Unit conversion
![0.19784 kg/mol (kilograms per mole)](../image_source/b1914adad8473b4271ffc237e940b3bd.png)
0.19784 kg/mol (kilograms per mole)
Comparisons
![≈ 0.27 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/bbdc053d7b7698f109f52faa98a512bb.png)
≈ 0.27 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ molar mass of caffeine ( ≈ 194 g/mol )](../image_source/49171dedff61ad37ca7f0aa2981113f8.png)
≈ molar mass of caffeine ( ≈ 194 g/mol )
![≈ 3.4 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/6d326aceb95edebbeff50b6d28136db0.png)
≈ 3.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.3×10^-22 grams | 3.3×10^-25 kg (kilograms) | 198 u (unified atomic mass units) | 198 Da (daltons)](../image_source/cda5a261871e38aed0f89164b5c966b7.png)
Mass of a molecule m from m = M/N_A: | 3.3×10^-22 grams | 3.3×10^-25 kg (kilograms) | 198 u (unified atomic mass units) | 198 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 198](../image_source/95ab593bab3095c3f08e4f8059840599.png)
Relative molecular mass M_r from M_r = M_u/M: | 198