Input interpretation
![methylamine | molar mass](../image_source/599df20337120f768e2b34fb04f8d2e4.png)
methylamine | molar mass
Result
![Find the molar mass, M, for methylamine: 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: CH_3NH_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 1 H (hydrogen) | 5 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) | 1 | 12.011 H (hydrogen) | 5 | 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) | 1 | 12.011 | 1 × 12.011 = 12.011 H (hydrogen) | 5 | 1.008 | 5 × 1.008 = 5.040 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 M = 12.011 g/mol + 5.040 g/mol + 14.007 g/mol = 31.058 g/mol](../image_source/3dc490a1f5abbe32493fe3611e805d00.png)
Find the molar mass, M, for methylamine: 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: CH_3NH_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 1 H (hydrogen) | 5 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) | 1 | 12.011 H (hydrogen) | 5 | 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) | 1 | 12.011 | 1 × 12.011 = 12.011 H (hydrogen) | 5 | 1.008 | 5 × 1.008 = 5.040 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 M = 12.011 g/mol + 5.040 g/mol + 14.007 g/mol = 31.058 g/mol
Unit conversion
![0.031058 kg/mol (kilograms per mole)](../image_source/48170a753751cac50d32b331eed3927e.png)
0.031058 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.16 ≈ 1/6 ) × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/7456cf0bc5a711655c6ca34b06799b74.png)
≈ ( 0.16 ≈ 1/6 ) × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 0.53 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/4db2e61e3b70dff2196530f94927645b.png)
≈ 0.53 × molar mass of sodium chloride ( ≈ 58 g/mol )
![≈ 1.7 × molar mass of water ( ≈ 18 g/mol )](../image_source/9e5cb6e538845edebe6a4ce54c78702a.png)
≈ 1.7 × molar mass of water ( ≈ 18 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 5.2×10^-23 grams | 5.2×10^-26 kg (kilograms) | 31 u (unified atomic mass units) | 31 Da (daltons)](../image_source/10e0492c6f7a8d0829ba522831efabe7.png)
Mass of a molecule m from m = M/N_A: | 5.2×10^-23 grams | 5.2×10^-26 kg (kilograms) | 31 u (unified atomic mass units) | 31 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 31](../image_source/7ca55903be99531bf379482f9cf3dbf2.png)
Relative molecular mass M_r from M_r = M_u/M: | 31