Input interpretation
![oxtriphylline | molecular mass](../image_source/4d14beab321c4451cb13c5e114efdd2e.png)
oxtriphylline | molecular mass
Result
![Find the molecular mass, m, for oxtriphylline: 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_21N_5O_3 Use the chemical formula, C_12H_21N_5O_3, to count the number of atoms, N_i, for each element: | N_i C (carbon) | 12 H (hydrogen) | 21 N (nitrogen) | 5 O (oxygen) | 3 Look up the atomic mass, m_i, in unified atomic mass units, u, for each element in the periodic table: | N_i | m_i/u C (carbon) | 12 | 12.011 H (hydrogen) | 21 | 1.008 N (nitrogen) | 5 | 14.007 O (oxygen) | 3 | 15.999 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molecular mass, m: Answer: | | | N_i | m_i/u | mass/u C (carbon) | 12 | 12.011 | 12 × 12.011 = 144.132 H (hydrogen) | 21 | 1.008 | 21 × 1.008 = 21.168 N (nitrogen) | 5 | 14.007 | 5 × 14.007 = 70.035 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 m = 144.132 u + 21.168 u + 70.035 u + 47.997 u = 283.332 u](../image_source/759928e2e0ef14628258b18dfffafc7e.png)
Find the molecular mass, m, for oxtriphylline: 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_21N_5O_3 Use the chemical formula, C_12H_21N_5O_3, to count the number of atoms, N_i, for each element: | N_i C (carbon) | 12 H (hydrogen) | 21 N (nitrogen) | 5 O (oxygen) | 3 Look up the atomic mass, m_i, in unified atomic mass units, u, for each element in the periodic table: | N_i | m_i/u C (carbon) | 12 | 12.011 H (hydrogen) | 21 | 1.008 N (nitrogen) | 5 | 14.007 O (oxygen) | 3 | 15.999 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molecular mass, m: Answer: | | | N_i | m_i/u | mass/u C (carbon) | 12 | 12.011 | 12 × 12.011 = 144.132 H (hydrogen) | 21 | 1.008 | 21 × 1.008 = 21.168 N (nitrogen) | 5 | 14.007 | 5 × 14.007 = 70.035 O (oxygen) | 3 | 15.999 | 3 × 15.999 = 47.997 m = 144.132 u + 21.168 u + 70.035 u + 47.997 u = 283.332 u
Unit conversions
![283.33 Da (daltons)](../image_source/d0b65ad0a5e6a5d9af24041339854c0a.png)
283.33 Da (daltons)
![0.28333 kDa (kilodaltons)](../image_source/9d20391d2c27c9376584b8b8fd0cfd96.png)
0.28333 kDa (kilodaltons)
![4.7048×10^-22 grams](../image_source/2299698fd0a75edf6d27656daa243dd2.png)
4.7048×10^-22 grams
![4.7048×10^-25 kg (kilograms)](../image_source/286cb7b09b01bd95614d4cb407360f91.png)
4.7048×10^-25 kg (kilograms)
![283.34 chemical atomic mass units (unit officially deprecated)](../image_source/0c513ff08e3d8f9151334fb0e6808b4f.png)
283.34 chemical atomic mass units (unit officially deprecated)
![283.42 physical atomic mass units (unit officially deprecated)](../image_source/a83d5d9ced8d5805cf9ff4ab5bd7b461.png)
283.42 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ 0.39 × molecular mass of fullerene ( ≈ 721 u )](../image_source/87d0b934b201f8d57cc5bcccb754b873.png)
≈ 0.39 × molecular mass of fullerene ( ≈ 721 u )
![≈ 1.5 × molecular mass of caffeine ( ≈ 194 u )](../image_source/90d2a27d1e571562ac57ef02649af340.png)
≈ 1.5 × molecular mass of caffeine ( ≈ 194 u )
![≈ 4.8 × molecular mass of sodium chloride ( ≈ 58 u )](../image_source/2ea0c8aa55db18b888df06fff8b031e1.png)
≈ 4.8 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 283](../image_source/a0d09b2eb9e8f4146e81bbc7c888658f.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 283
![Molar mass M from M = m_aN_A: | 283 g/mol (grams per mole)](../image_source/644ee60c48db1da64168240e5415d5a1.png)
Molar mass M from M = m_aN_A: | 283 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 283](../image_source/95e0176a62a2c701f26e007af0f730bc.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 283
![Molar mass M from M = m_mN_A: | 283 g/mol (grams per mole)](../image_source/38722cff4ced997cd062ee74c165c38b.png)
Molar mass M from M = m_mN_A: | 283 g/mol (grams per mole)