Input interpretation
![potassium chlorate | molar mass](../image_source/96819f8f01b4b8167974b20daf0fa1b8.png)
potassium chlorate | molar mass
Result
![Find the molar mass, M, for potassium chlorate: 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: KClO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | number of atoms Cl (chlorine) | 1 K (potassium) | 1 O (oxygen) | 3 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | number of atoms | atomic mass/g·mol^(-1) Cl (chlorine) | 1 | 35.45 K (potassium) | 1 | 39.0983 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: | | | number of atoms | atomic mass/g·mol^(-1) | mass/g·mol^(-1) Cl (chlorine) | 1 | 35.45 | 1 × 35.45 = 35.45 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 M = 35.45 g/mol + 39.0983 g/mol + 47.997 g/mol = 122.55 g/mol](../image_source/5d8e8cfdccb626ab2a485554ba53db6e.png)
Find the molar mass, M, for potassium chlorate: 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: KClO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | number of atoms Cl (chlorine) | 1 K (potassium) | 1 O (oxygen) | 3 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | number of atoms | atomic mass/g·mol^(-1) Cl (chlorine) | 1 | 35.45 K (potassium) | 1 | 39.0983 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: | | | number of atoms | atomic mass/g·mol^(-1) | mass/g·mol^(-1) Cl (chlorine) | 1 | 35.45 | 1 × 35.45 = 35.45 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 M = 35.45 g/mol + 39.0983 g/mol + 47.997 g/mol = 122.55 g/mol
Unit conversion
![0.1225 kg/mol (kilograms per mole)](../image_source/92d91dc381a167aa6ccd5a02d82d739e.png)
0.1225 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.17 ≈ 1/6 ) × molar mass of fullerene (≈ 721 g/mol )](../image_source/b59d8b709b1045ac16fcfe6e1517a640.png)
≈ ( 0.17 ≈ 1/6 ) × molar mass of fullerene (≈ 721 g/mol )
![≈ 0.63 × molar mass of caffeine (≈ 194 g/mol )](../image_source/6f82f5279d1d3f1073772119274a7d54.png)
≈ 0.63 × molar mass of caffeine (≈ 194 g/mol )
![≈ 2.1 × molar mass of sodium chloride (≈ 58 g/mol )](../image_source/2149a0e8b186d7d5676a3a244038c176.png)
≈ 2.1 × molar mass of sodium chloride (≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2×10^-22 grams | 2×10^-25 kg (kilograms) | 123 u (unified atomic mass units) | 123 Da (daltons)](../image_source/5a574762bde079727612705076156de3.png)
Mass of a molecule m from m = M/N_A: | 2×10^-22 grams | 2×10^-25 kg (kilograms) | 123 u (unified atomic mass units) | 123 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 123](../image_source/1c46b4d145e6d9d99465464e697bcd35.png)
Relative molecular mass M_r from M_r = M_u/M: | 123