Input interpretation
![sodium chromate | molar mass](../image_source/5b1db73771ac3751ac584f0eaeed3084.png)
sodium chromate | molar mass
Result
![Find the molar mass, M, for sodium 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: Na_2CrO_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cr (chromium) | 1 Na (sodium) | 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 Na (sodium) | 2 | 22.98976928 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 Na (sodium) | 2 | 22.98976928 | 2 × 22.98976928 = 45.97953856 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 M = 51.9961 g/mol + 45.97953856 g/mol + 63.996 g/mol = 161.972 g/mol](../image_source/25f66c0cd6c9f2ee0e7a138a9f09825e.png)
Find the molar mass, M, for sodium 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: Na_2CrO_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cr (chromium) | 1 Na (sodium) | 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 Na (sodium) | 2 | 22.98976928 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 Na (sodium) | 2 | 22.98976928 | 2 × 22.98976928 = 45.97953856 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 M = 51.9961 g/mol + 45.97953856 g/mol + 63.996 g/mol = 161.972 g/mol
Unit conversion
![0.16197 kg/mol (kilograms per mole)](../image_source/148f2764462cf115034f8eacab216923.png)
0.16197 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.22 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/9a87e11ceb189e51bc2d4e170a4cce20.png)
≈ ( 0.22 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.83 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/86e018d6ac846675327792fb63bb009d.png)
≈ 0.83 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.8 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/ba07622995f8aad1f9808ac82495b0cf.png)
≈ 2.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.7×10^-22 grams | 2.7×10^-25 kg (kilograms) | 162 u (unified atomic mass units) | 162 Da (daltons)](../image_source/c57a5161bcaf09fcbe913e3960ef61c7.png)
Mass of a molecule m from m = M/N_A: | 2.7×10^-22 grams | 2.7×10^-25 kg (kilograms) | 162 u (unified atomic mass units) | 162 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 162](../image_source/d31dc9f609f41ccc124ea690b34fa44a.png)
Relative molecular mass M_r from M_r = M_u/M: | 162