Input interpretation
![metaphosphoric acid | molar mass](../image_source/9c810ad289844a49617f6b4e1ff14f4c.png)
metaphosphoric acid | molar mass
Result
![Find the molar mass, M, for metaphosphoric 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: HPO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 1 O (oxygen) | 3 P (phosphorus) | 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) | 1 | 1.008 O (oxygen) | 3 | 15.999 P (phosphorus) | 1 | 30.973761998 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 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 1.008 g/mol + 47.997 g/mol + 30.973761998 g/mol = 79.979 g/mol](../image_source/79608dc03d54972eb5a9f6c18b658351.png)
Find the molar mass, M, for metaphosphoric 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: HPO_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 1 O (oxygen) | 3 P (phosphorus) | 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) | 1 | 1.008 O (oxygen) | 3 | 15.999 P (phosphorus) | 1 | 30.973761998 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 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 1.008 g/mol + 47.997 g/mol + 30.973761998 g/mol = 79.979 g/mol
Unit conversion
![0.079979 kg/mol (kilograms per mole)](../image_source/02118c081917e4ad50b58bc9d0b65000.png)
0.079979 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.11 ≈ 1/9 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/f070d452ca295939aadcf6c6f76807cf.png)
≈ ( 0.11 ≈ 1/9 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.41 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/78080660aaabe227b53eb0f705f183df.png)
≈ 0.41 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.4 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/29d079ed258f130872ad708cf4eb43d7.png)
≈ 1.4 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.3×10^-22 grams | 1.3×10^-25 kg (kilograms) | 80 u (unified atomic mass units) | 80 Da (daltons)](../image_source/31c626b0d228d06113ce57ba68d57bd7.png)
Mass of a molecule m from m = M/N_A: | 1.3×10^-22 grams | 1.3×10^-25 kg (kilograms) | 80 u (unified atomic mass units) | 80 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 80](../image_source/0d5725bc222a9fea3ac82e2342d495a3.png)
Relative molecular mass M_r from M_r = M_u/M: | 80