Input interpretation
![potassium superoxide | molar mass](../image_source/8dca18080efaaa0abad893089fa89e91.png)
potassium superoxide | molar mass
Result
![Find the molar mass, M, for potassium superoxide: 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: KO_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i K (potassium) | 1 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) K (potassium) | 1 | 39.0983 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) K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 39.0983 g/mol + 31.998 g/mol = 71.096 g/mol](../image_source/53172e585aa5cf66048cb3424b91fdaf.png)
Find the molar mass, M, for potassium superoxide: 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: KO_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i K (potassium) | 1 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) K (potassium) | 1 | 39.0983 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) K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 39.0983 g/mol + 31.998 g/mol = 71.096 g/mol
Unit conversion
![0.071096 kg/mol (kilograms per mole)](../image_source/234d3edb48e9cb58c118d201679d1aa0.png)
0.071096 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.099 ≈ 1/10 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/4cf992141d132367dc5229177557bfea.png)
≈ ( 0.099 ≈ 1/10 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.37 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/03fa02e86cc75989f9db6499e0eb7fa2.png)
≈ 0.37 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.2 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/60860bc09c00aad54675a17dda5d0b59.png)
≈ 1.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.2×10^-22 grams | 1.2×10^-25 kg (kilograms) | 71 u (unified atomic mass units) | 71 Da (daltons)](../image_source/241b545f6e133d095a03dcc3a086c668.png)
Mass of a molecule m from m = M/N_A: | 1.2×10^-22 grams | 1.2×10^-25 kg (kilograms) | 71 u (unified atomic mass units) | 71 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 71](../image_source/0cc4ff6ab3a390a62856e20381e78c60.png)
Relative molecular mass M_r from M_r = M_u/M: | 71