Input interpretation
![strontium sulfide | molar mass](../image_source/2c60a3f220837c3c08d87afbd9e560a1.png)
strontium sulfide | molar mass
Result
![Find the molar mass, M, for strontium sulfide: 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: SrS Use the chemical formula to count the number of atoms, N_i, for each element: | number of atoms S (sulfur) | 1 Sr (strontium) | 1 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | number of atoms | atomic mass/g·mol^(-1) S (sulfur) | 1 | 32.06 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: | | | number of atoms | atomic mass/g·mol^(-1) | mass/g·mol^(-1) S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 Sr (strontium) | 1 | 87.62 | 1 × 87.62 = 87.62 M = 32.06 g/mol + 87.62 g/mol = 119.68 g/mol](../image_source/e08355f0dd5bceaaa3c0a870b7ebb342.png)
Find the molar mass, M, for strontium sulfide: 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: SrS Use the chemical formula to count the number of atoms, N_i, for each element: | number of atoms S (sulfur) | 1 Sr (strontium) | 1 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | number of atoms | atomic mass/g·mol^(-1) S (sulfur) | 1 | 32.06 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: | | | number of atoms | atomic mass/g·mol^(-1) | mass/g·mol^(-1) S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 Sr (strontium) | 1 | 87.62 | 1 × 87.62 = 87.62 M = 32.06 g/mol + 87.62 g/mol = 119.68 g/mol
Unit conversion
![0.1197 kg/mol (kilograms per mole)](../image_source/625aa313dc09ac0755f69e83b260038d.png)
0.1197 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.17 ≈ 1/6 ) × molar mass of fullerene (≈ 721 g/mol )](../image_source/92d51822c7b84fa0a4ee8ce19dcd10d8.png)
≈ ( 0.17 ≈ 1/6 ) × molar mass of fullerene (≈ 721 g/mol )
![≈ 0.62 × molar mass of caffeine (≈ 194 g/mol )](../image_source/01017460d2a881ae0520b66d68476167.png)
≈ 0.62 × molar mass of caffeine (≈ 194 g/mol )
![≈ 2 × molar mass of sodium chloride (≈ 58 g/mol )](../image_source/f702ca1a4cdf0291f2128a198f32ce83.png)
≈ 2 × molar mass of sodium chloride (≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 2×10^-22 grams | 2×10^-25 kg (kilograms) | 120 u (unified atomic mass units) | 120 Da (daltons)](../image_source/3c0a822e7929586e0d7f6a79b56bbd3e.png)
Mass of a molecule m from m = M/N_A: | 2×10^-22 grams | 2×10^-25 kg (kilograms) | 120 u (unified atomic mass units) | 120 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 120](../image_source/a3b7b2342fd2b48afdde17f04a5d7f3d.png)
Relative molecular mass M_r from M_r = M_u/M: | 120