Input interpretation
![ethylamine | molar mass](../image_source/cf38b179f9c3bbecc2f78a81b75df5de.png)
ethylamine | molar mass
Result
![Find the molar mass, M, for ethylamine: 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: C_2H_5NH_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 7 N (nitrogen) | 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) C (carbon) | 2 | 12.011 H (hydrogen) | 7 | 1.008 N (nitrogen) | 1 | 14.007 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) C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 H (hydrogen) | 7 | 1.008 | 7 × 1.008 = 7.056 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 M = 24.022 g/mol + 7.056 g/mol + 14.007 g/mol = 45.085 g/mol](../image_source/07fb6944ca83c0e3356aac18a5a9e743.png)
Find the molar mass, M, for ethylamine: 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: C_2H_5NH_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 2 H (hydrogen) | 7 N (nitrogen) | 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) C (carbon) | 2 | 12.011 H (hydrogen) | 7 | 1.008 N (nitrogen) | 1 | 14.007 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) C (carbon) | 2 | 12.011 | 2 × 12.011 = 24.022 H (hydrogen) | 7 | 1.008 | 7 × 1.008 = 7.056 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 M = 24.022 g/mol + 7.056 g/mol + 14.007 g/mol = 45.085 g/mol
Unit conversion
![0.04509 kg/mol (kilograms per mole)](../image_source/235447f98d16441fede2e95f4719602f.png)
0.04509 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.063 ≈ 1/16 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/0b60324d46a70544b577feb994d9b371.png)
≈ ( 0.063 ≈ 1/16 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ ( 0.23 ≈ 1/4 ) × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/3fbd8f5393ccd23e13a15aab38b9bf92.png)
≈ ( 0.23 ≈ 1/4 ) × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 0.77 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/ed18a4b5a99470038effb236710bc30e.png)
≈ 0.77 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 7.5×10^-23 grams | 7.5×10^-26 kg (kilograms) | 45 u (unified atomic mass units) | 45 Da (daltons)](../image_source/d07c9097344d055253b8f465ef577487.png)
Mass of a molecule m from m = M/N_A: | 7.5×10^-23 grams | 7.5×10^-26 kg (kilograms) | 45 u (unified atomic mass units) | 45 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 45](../image_source/bf352679dafd1bad76cef3a4ff0dc424.png)
Relative molecular mass M_r from M_r = M_u/M: | 45