Input interpretation
![2, 5-dibromo-3-octylthiophene | molar mass](../image_source/85cbaf9d4362b58bed377606a1ff0af0.png)
2, 5-dibromo-3-octylthiophene | molar mass
Result
![Find the molar mass, M, for 2, 5-dibromo-3-octylthiophene: 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_12H_18Br_2S Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 12 H (hydrogen) | 18 S (sulfur) | 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) Br (bromine) | 2 | 79.904 C (carbon) | 12 | 12.011 H (hydrogen) | 18 | 1.008 S (sulfur) | 1 | 32.06 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) Br (bromine) | 2 | 79.904 | 2 × 79.904 = 159.808 C (carbon) | 12 | 12.011 | 12 × 12.011 = 144.132 H (hydrogen) | 18 | 1.008 | 18 × 1.008 = 18.144 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 159.808 g/mol + 144.132 g/mol + 18.144 g/mol + 32.06 g/mol = 354.14 g/mol](../image_source/d98a202f9741e2dff77de3d9a7294cc7.png)
Find the molar mass, M, for 2, 5-dibromo-3-octylthiophene: 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_12H_18Br_2S Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Br (bromine) | 2 C (carbon) | 12 H (hydrogen) | 18 S (sulfur) | 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) Br (bromine) | 2 | 79.904 C (carbon) | 12 | 12.011 H (hydrogen) | 18 | 1.008 S (sulfur) | 1 | 32.06 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) Br (bromine) | 2 | 79.904 | 2 × 79.904 = 159.808 C (carbon) | 12 | 12.011 | 12 × 12.011 = 144.132 H (hydrogen) | 18 | 1.008 | 18 × 1.008 = 18.144 S (sulfur) | 1 | 32.06 | 1 × 32.06 = 32.06 M = 159.808 g/mol + 144.132 g/mol + 18.144 g/mol + 32.06 g/mol = 354.14 g/mol
Unit conversion
![0.35414 kg/mol (kilograms per mole)](../image_source/40c290dfce5e588b0510809971e7df4d.png)
0.35414 kg/mol (kilograms per mole)
Comparisons
![≈ 0.49 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/b21d5169f1a37d08323753c31c28cd21.png)
≈ 0.49 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.8 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/a3f48a7c0138206a0f2fa95c436f8ce8.png)
≈ 1.8 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 6.1 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/f68f4e96f085962ff66d92054db90e88.png)
≈ 6.1 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 5.9×10^-22 grams | 5.9×10^-25 kg (kilograms) | 354 u (unified atomic mass units) | 354 Da (daltons)](../image_source/912e93ceb72fe4d848885b2aad841027.png)
Mass of a molecule m from m = M/N_A: | 5.9×10^-22 grams | 5.9×10^-25 kg (kilograms) | 354 u (unified atomic mass units) | 354 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 354](../image_source/a9dba2fe5130e085368bff9a987468bb.png)
Relative molecular mass M_r from M_r = M_u/M: | 354