Input interpretation
![white phosphorus | molar mass](../image_source/c97fc687312b843e6b31153ce559cb17.png)
white phosphorus | molar mass
Result
![Find the molar mass, M, for white phosphorus: 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: P_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i P (phosphorus) | 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) P (phosphorus) | 4 | 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) P (phosphorus) | 4 | 30.973761998 | 4 × 30.973761998 = 123.895047992 M = 123.895047992 g/mol](../image_source/170c2f82908228c634818b60223f418e.png)
Find the molar mass, M, for white phosphorus: 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: P_4 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i P (phosphorus) | 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) P (phosphorus) | 4 | 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) P (phosphorus) | 4 | 30.973761998 | 4 × 30.973761998 = 123.895047992 M = 123.895047992 g/mol
Unit conversion
![0.12389504799 kg/mol (kilograms per mole)](../image_source/a19fc3be5f380d5ef0da1137391a1fe7.png)
0.12389504799 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.17 ≈ 1/6 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/f125bf6a77498fda318831fad33c4f41.png)
≈ ( 0.17 ≈ 1/6 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.64 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/9fc05ada822099be51cdbf9e11bc2bc6.png)
≈ 0.64 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.1 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/24a13fd417f100697f38346a8f198754.png)
≈ 2.1 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.1×10^-22 grams | 2.1×10^-25 kg (kilograms) | 124 u (unified atomic mass units) | 124 Da (daltons)](../image_source/2103cb17a3f01c18b91471800ff92bee.png)
Mass of a molecule m from m = M/N_A: | 2.1×10^-22 grams | 2.1×10^-25 kg (kilograms) | 124 u (unified atomic mass units) | 124 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 124](../image_source/d0e55adb4bf27a5e39caf8191d0d0f44.png)
Relative molecular mass M_r from M_r = M_u/M: | 124