Input interpretation
![nitrous acid | molar mass](../image_source/07a1a2a8d0b6f75181f563ff150582a3.png)
nitrous acid | molar mass
Result
![Find the molar mass, M, for nitrous acid: 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: HNO_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 1 N (nitrogen) | 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) H (hydrogen) | 1 | 1.008 N (nitrogen) | 1 | 14.007 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) H (hydrogen) | 1 | 1.008 | 1 × 1.008 = 1.008 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 1.008 g/mol + 14.007 g/mol + 31.998 g/mol = 47.013 g/mol](../image_source/34db2c049d5069e33bc71e0101ac1600.png)
Find the molar mass, M, for nitrous acid: 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: HNO_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 1 N (nitrogen) | 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) H (hydrogen) | 1 | 1.008 N (nitrogen) | 1 | 14.007 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) H (hydrogen) | 1 | 1.008 | 1 × 1.008 = 1.008 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 1.008 g/mol + 14.007 g/mol + 31.998 g/mol = 47.013 g/mol
Unit conversion
![0.047013 kg/mol (kilograms per mole)](../image_source/ff71723992548d0b2e057e27b9d65f36.png)
0.047013 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.065 ≈ 1/15 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/5fcb39f7acf579537713bf690660a122.png)
≈ ( 0.065 ≈ 1/15 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ ( 0.24 ≈ 1/4 ) × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/ad5aef8dd492c63a21673ee3e34f0231.png)
≈ ( 0.24 ≈ 1/4 ) × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 0.8 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/5eadfe12fa9524df61c5699c5e113c60.png)
≈ 0.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 7.8×10^-23 grams | 7.8×10^-26 kg (kilograms) | 47 u (unified atomic mass units) | 47 Da (daltons)](../image_source/4fdbad87330d425975c1858b2af12d96.png)
Mass of a molecule m from m = M/N_A: | 7.8×10^-23 grams | 7.8×10^-26 kg (kilograms) | 47 u (unified atomic mass units) | 47 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 47](../image_source/c8812e8beddabbb0b610af7771865187.png)
Relative molecular mass M_r from M_r = M_u/M: | 47