Input interpretation
![lime | molar mass](../image_source/ffa3a29a4a2c7557260a124a1d3d236a.png)
lime | molar mass
Result
![Find the molar mass, M, for lime: 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: CaO Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Ca (calcium) | 1 O (oxygen) | 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) Ca (calcium) | 1 | 40.078 O (oxygen) | 1 | 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) Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 M = 40.078 g/mol + 15.999 g/mol = 56.077 g/mol](../image_source/45cba53be6d08d3cc9f0313385e40703.png)
Find the molar mass, M, for lime: 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: CaO Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Ca (calcium) | 1 O (oxygen) | 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) Ca (calcium) | 1 | 40.078 O (oxygen) | 1 | 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) Ca (calcium) | 1 | 40.078 | 1 × 40.078 = 40.078 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 M = 40.078 g/mol + 15.999 g/mol = 56.077 g/mol
Unit conversion
![0.056077 kg/mol (kilograms per mole)](../image_source/6b6b473755b984d240a2727762d3ad27.png)
0.056077 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.078 ≈ 1/13 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/2101bb2a88d25503ef547a123df6816b.png)
≈ ( 0.078 ≈ 1/13 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.29 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/f2a3a59b12e6ba740e514a0925d6f6b5.png)
≈ 0.29 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 0.96 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/37ff25784ad4a15ac33411aaf19a642c.png)
≈ 0.96 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 9.3×10^-23 grams | 9.3×10^-26 kg (kilograms) | 56 u (unified atomic mass units) | 56 Da (daltons)](../image_source/ee45da85d650db1c5bc6caef84949764.png)
Mass of a molecule m from m = M/N_A: | 9.3×10^-23 grams | 9.3×10^-26 kg (kilograms) | 56 u (unified atomic mass units) | 56 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 56](../image_source/c1b9c608a8b35446600ad8fea2cdd163.png)
Relative molecular mass M_r from M_r = M_u/M: | 56