Input interpretation
![strontium selenide | molar mass](../image_source/58dbb42d21710af6d8516b986705e83e.png)
strontium selenide | molar mass
Result
![Find the molar mass, M, for strontium selenide: 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: SrSe Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Se (selenium) | 1 Sr (strontium) | 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) Se (selenium) | 1 | 78.971 Sr (strontium) | 1 | 87.62 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) Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 Sr (strontium) | 1 | 87.62 | 1 × 87.62 = 87.62 M = 78.971 g/mol + 87.62 g/mol = 166.59 g/mol](../image_source/da06cffe7a2f612be4ffd2b1144f9f25.png)
Find the molar mass, M, for strontium selenide: 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: SrSe Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Se (selenium) | 1 Sr (strontium) | 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) Se (selenium) | 1 | 78.971 Sr (strontium) | 1 | 87.62 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) Se (selenium) | 1 | 78.971 | 1 × 78.971 = 78.971 Sr (strontium) | 1 | 87.62 | 1 × 87.62 = 87.62 M = 78.971 g/mol + 87.62 g/mol = 166.59 g/mol
Unit conversion
![0.1666 kg/mol (kilograms per mole)](../image_source/b6759e328f00699d70dfe4c12fe55137.png)
0.1666 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.23 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/729d181f063c27d863ffe8990e088ea5.png)
≈ ( 0.23 ≈ 1/4 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.86 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/f8f044705570cd2c558b05d75a9c88b1.png)
≈ 0.86 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 2.9 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/d3974848a841259a69f271361c52462f.png)
≈ 2.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2.8×10^-22 grams | 2.8×10^-25 kg (kilograms) | 167 u (unified atomic mass units) | 167 Da (daltons)](../image_source/89cc7deb4946ba2a4a29cb1c6b04d78c.png)
Mass of a molecule m from m = M/N_A: | 2.8×10^-22 grams | 2.8×10^-25 kg (kilograms) | 167 u (unified atomic mass units) | 167 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 167](../image_source/1bf02c4ec4dd6c5e64249a296ac75c26.png)
Relative molecular mass M_r from M_r = M_u/M: | 167