Input interpretation
![magnesium chloride | molar mass](../image_source/585b27a88ed19da3bb8e294ecc9f3f02.png)
magnesium chloride | molar mass
Result
![Find the molar mass, M, for magnesium chloride: 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: MgCl_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cl (chlorine) | 2 Mg (magnesium) | 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) Cl (chlorine) | 2 | 35.45 Mg (magnesium) | 1 | 24.305 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) Cl (chlorine) | 2 | 35.45 | 2 × 35.45 = 70.90 Mg (magnesium) | 1 | 24.305 | 1 × 24.305 = 24.305 M = 70.90 g/mol + 24.305 g/mol = 95.21 g/mol](../image_source/02cc0de7389a74f8d20f812282fc8447.png)
Find the molar mass, M, for magnesium chloride: 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: MgCl_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Cl (chlorine) | 2 Mg (magnesium) | 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) Cl (chlorine) | 2 | 35.45 Mg (magnesium) | 1 | 24.305 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) Cl (chlorine) | 2 | 35.45 | 2 × 35.45 = 70.90 Mg (magnesium) | 1 | 24.305 | 1 × 24.305 = 24.305 M = 70.90 g/mol + 24.305 g/mol = 95.21 g/mol
Unit conversion
![0.09521 kg/mol (kilograms per mole)](../image_source/1a2ce1d00dcf2bab76afc527813e94cc.png)
0.09521 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.13 ≈ 1/8 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/9e99251e1ff9b3040c8d9d0a455e87df.png)
≈ ( 0.13 ≈ 1/8 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.49 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/28d2f0949177efb288937a1e783112b8.png)
≈ 0.49 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.6 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/eab3652d64cc32f5b77d0db944dc4cd4.png)
≈ 1.6 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.6×10^-22 grams | 1.6×10^-25 kg (kilograms) | 95 u (unified atomic mass units) | 95 Da (daltons)](../image_source/55407c989811e0ab82f77928dc4c5bb4.png)
Mass of a molecule m from m = M/N_A: | 1.6×10^-22 grams | 1.6×10^-25 kg (kilograms) | 95 u (unified atomic mass units) | 95 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 95](../image_source/142f243ce340e59e11bbaa1c0c99dad8.png)
Relative molecular mass M_r from M_r = M_u/M: | 95