Input interpretation
![cyclopentane | molar mass](../image_source/a922605a3ea00cf36faefc991d1e9776.png)
cyclopentane | molar mass
Result
![Find the molar mass, M, for cyclopentane: 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_5H_10 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 5 H (hydrogen) | 10 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) | 5 | 12.011 H (hydrogen) | 10 | 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) | 5 | 12.011 | 5 × 12.011 = 60.055 H (hydrogen) | 10 | 1.008 | 10 × 1.008 = 10.080 M = 60.055 g/mol + 10.080 g/mol = 70.135 g/mol](../image_source/3a7866f26ba85798bc5b3a9baf000d31.png)
Find the molar mass, M, for cyclopentane: 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_5H_10 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 5 H (hydrogen) | 10 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) | 5 | 12.011 H (hydrogen) | 10 | 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) | 5 | 12.011 | 5 × 12.011 = 60.055 H (hydrogen) | 10 | 1.008 | 10 × 1.008 = 10.080 M = 60.055 g/mol + 10.080 g/mol = 70.135 g/mol
Unit conversion
![0.07014 kg/mol (kilograms per mole)](../image_source/7748e4dba2373f9da396fe38602da23c.png)
0.07014 kg/mol (kilograms per mole)
Comparisons
![≈ ( 0.097 ≈ 1/10 ) × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/7c6803c23aa86ca18c41fae5c864b734.png)
≈ ( 0.097 ≈ 1/10 ) × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 0.36 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/549b765f280a90473c98e37aa9633ed6.png)
≈ 0.36 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 1.2 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/5c2f7976452f977074ae43ea484b4732.png)
≈ 1.2 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 1.2×10^-22 grams | 1.2×10^-25 kg (kilograms) | 70 u (unified atomic mass units) | 70 Da (daltons)](../image_source/27c13ab10812d30bc8d01228ce17b33b.png)
Mass of a molecule m from m = M/N_A: | 1.2×10^-22 grams | 1.2×10^-25 kg (kilograms) | 70 u (unified atomic mass units) | 70 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 70](../image_source/5d8f9ab44cdb2072d535c159ccad2741.png)
Relative molecular mass M_r from M_r = M_u/M: | 70