Input interpretation
![N-hexane | molar mass](../image_source/db90a3e8a248a269cb4c0176078c1126.png)
N-hexane | molar mass
Result
![Find the molar mass, M, for N-hexane: 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_3(CH_2)_4CH_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 6 H (hydrogen) | 14 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) | 6 | 12.011 H (hydrogen) | 14 | 1.008 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) | 6 | 12.011 | 6 × 12.011 = 72.066 H (hydrogen) | 14 | 1.008 | 14 × 1.008 = 14.112 M = 72.066 g/mol + 14.112 g/mol = 86.178 g/mol](../image_source/a59f5f83c1f0e21bd4a6e5283a400273.png)
Find the molar mass, M, for N-hexane: 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_3(CH_2)_4CH_3 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 6 H (hydrogen) | 14 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) | 6 | 12.011 H (hydrogen) | 14 | 1.008 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) | 6 | 12.011 | 6 × 12.011 = 72.066 H (hydrogen) | 14 | 1.008 | 14 × 1.008 = 14.112 M = 72.066 g/mol + 14.112 g/mol = 86.178 g/mol
Unit conversion
![0.08618 kg/mol (kilograms per mole)](../image_source/0bb679bba66337f37ef1a29a6be4552b.png)
0.08618 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.12 ≈ 1/8 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/88468686bd471a6dd7c4a2e73f43d719.png)
≈ ( 0.12 ≈ 1/8 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.44 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/3508918b20f2d090d0efce6fb09bf5b9.png)
≈ 0.44 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.5 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/138f121423583988b30f80ff52aa5308.png)
≈ 1.5 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.4×10^-22 grams | 1.4×10^-25 kg (kilograms) | 86 u (unified atomic mass units) | 86 Da (daltons)](../image_source/17c1eca8a277883ee980b052018c1fce.png)
Mass of a molecule m from m = M/N_A: | 1.4×10^-22 grams | 1.4×10^-25 kg (kilograms) | 86 u (unified atomic mass units) | 86 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 86](../image_source/405566115a8062d251c9dbe4324021eb.png)
Relative molecular mass M_r from M_r = M_u/M: | 86