Input interpretation
![tungstic acid | molar mass](../image_source/1e3d4a6f895b51d73ae8822ae3376bd7.png)
tungstic acid | molar mass
Result
![Find the molar mass, M, for tungstic 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: H_2WO_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 2 O (oxygen) | 4 W (tungsten) | 1 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) | 2 | 1.008 O (oxygen) | 4 | 15.999 W (tungsten) | 1 | 183.84 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) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 W (tungsten) | 1 | 183.84 | 1 × 183.84 = 183.84 M = 2.016 g/mol + 63.996 g/mol + 183.84 g/mol = 249.85 g/mol](../image_source/3544173f4f04df6bb91e025057dd486e.png)
Find the molar mass, M, for tungstic 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: H_2WO_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 2 O (oxygen) | 4 W (tungsten) | 1 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) | 2 | 1.008 O (oxygen) | 4 | 15.999 W (tungsten) | 1 | 183.84 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) | 2 | 1.008 | 2 × 1.008 = 2.016 O (oxygen) | 4 | 15.999 | 4 × 15.999 = 63.996 W (tungsten) | 1 | 183.84 | 1 × 183.84 = 183.84 M = 2.016 g/mol + 63.996 g/mol + 183.84 g/mol = 249.85 g/mol
Unit conversion
![0.24985 kg/mol (kilograms per mole)](../image_source/0aea28c0e8cd6b0b0b1891b2d5a111c0.png)
0.24985 kg/mol (kilograms per mole)
Comparisons
![≈ 0.35 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/df7a8c1fd1972c5babeea6e24b35f54e.png)
≈ 0.35 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/08cbe57fa92a03b2e724564390eb2087.png)
≈ 1.3 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 4.3 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/6ddd8877f5832ad276e6e16f508e23bc.png)
≈ 4.3 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 4.1×10^-22 grams | 4.1×10^-25 kg (kilograms) | 250 u (unified atomic mass units) | 250 Da (daltons)](../image_source/ce654c496d9902afce581659610d199b.png)
Mass of a molecule m from m = M/N_A: | 4.1×10^-22 grams | 4.1×10^-25 kg (kilograms) | 250 u (unified atomic mass units) | 250 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 250](../image_source/fbd0097ca7bd80babb0c359ccd8daea4.png)
Relative molecular mass M_r from M_r = M_u/M: | 250