Input interpretation
![potassium chromate | molar mass](../image_source/9865d696223f78bb5641ffec0b48654a.png)
potassium chromate | molar mass
Result
![Find the molar mass, M, for potassium chromate: 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: K_2CrO_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cr (chromium) | 1 K (potassium) | 2 O (oxygen) | 4 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) Cr (chromium) | 1 | 51.9961 K (potassium) | 2 | 39.0983 O (oxygen) | 4 | 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) Cr (chromium) | 1 | 51.9961 | 1 × 51.9961 = 51.9961 K (potassium) | 2 | 39.0983 | 2 × 39.0983 = 78.1966 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 M = 51.9961 g/mol + 78.1966 g/mol + 63.996 g/mol = 194.189 g/mol](../image_source/eddc53a86ea9b9bb5fc10e07eed50f63.png)
Find the molar mass, M, for potassium chromate: 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: K_2CrO_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cr (chromium) | 1 K (potassium) | 2 O (oxygen) | 4 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) Cr (chromium) | 1 | 51.9961 K (potassium) | 2 | 39.0983 O (oxygen) | 4 | 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) Cr (chromium) | 1 | 51.9961 | 1 × 51.9961 = 51.9961 K (potassium) | 2 | 39.0983 | 2 × 39.0983 = 78.1966 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 M = 51.9961 g/mol + 78.1966 g/mol + 63.996 g/mol = 194.189 g/mol
Unit conversion
![0.19419 kg/mol (kilograms per mole)](../image_source/f161bc4de599cf01a1e088805952470c.png)
0.19419 kg/mol (kilograms per mole)
Comparisons
![≈ 0.27 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/379c5afc07fa1e8c89712e4c7c1004b7.png)
≈ 0.27 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.999990 × molar mass of caffeine ( 194.191 g/mol )](../image_source/2edc1a3587d2b7bbc3fa8317e033d487.png)
≈ 0.999990 × molar mass of caffeine ( 194.191 g/mol )
![≈ 3.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/6053992e744857a9b8751e2b843ea218.png)
≈ 3.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.2×10^-22 grams | 3.2×10^-25 kg (kilograms) | 194 u (unified atomic mass units) | 194 Da (daltons)](../image_source/500b3eca4bc45dc8c597375d7bb29b78.png)
Mass of a molecule m from m = M/N_A: | 3.2×10^-22 grams | 3.2×10^-25 kg (kilograms) | 194 u (unified atomic mass units) | 194 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 194](../image_source/e40fce62082aae1eadb62a9b9576ad85.png)
Relative molecular mass M_r from M_r = M_u/M: | 194