Input interpretation
![potassium phosphinate | molar mass](../image_source/99af43c1d435678bf97a200f4a79460f.png)
potassium phosphinate | molar mass
Result
![Find the molar mass, M, for potassium phosphinate: 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: KH_2PO_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 2 K (potassium) | 1 O (oxygen) | 2 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) | 2 | 1.008 K (potassium) | 1 | 39.0983 O (oxygen) | 2 | 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) | 2 | 1.008 | 2 × 1.008 = 2.016 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 2.016 g/mol + 39.0983 g/mol + 31.998 g/mol + 30.973761998 g/mol = 104.086 g/mol](../image_source/789d2cd037e967a471a5f8178e804e90.png)
Find the molar mass, M, for potassium phosphinate: 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: KH_2PO_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i H (hydrogen) | 2 K (potassium) | 1 O (oxygen) | 2 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) | 2 | 1.008 K (potassium) | 1 | 39.0983 O (oxygen) | 2 | 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) | 2 | 1.008 | 2 × 1.008 = 2.016 K (potassium) | 1 | 39.0983 | 1 × 39.0983 = 39.0983 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 P (phosphorus) | 1 | 30.973761998 | 1 × 30.973761998 = 30.973761998 M = 2.016 g/mol + 39.0983 g/mol + 31.998 g/mol + 30.973761998 g/mol = 104.086 g/mol
Unit conversion
![0.10409 kg/mol (kilograms per mole)](../image_source/f4afe8d7deaaa615b2eeda3ba1469bc0.png)
0.10409 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.14 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/d1c96fe2770a42d995edcc7b3bcc1695.png)
≈ ( 0.14 ≈ 1/7 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.54 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/3fa42097b2b7ad6c2a689ef17014cd1f.png)
≈ 0.54 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.8 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/13264b07547782ca9f7e1aaa16e33cb3.png)
≈ 1.8 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.7×10^-22 grams | 1.7×10^-25 kg (kilograms) | 104 u (unified atomic mass units) | 104 Da (daltons)](../image_source/fb004c834434e84e414494d9de51f2e4.png)
Mass of a molecule m from m = M/N_A: | 1.7×10^-22 grams | 1.7×10^-25 kg (kilograms) | 104 u (unified atomic mass units) | 104 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 104](../image_source/e969049a59b1da08a46bf803ea8d3945.png)
Relative molecular mass M_r from M_r = M_u/M: | 104