Input interpretation
![mercuric oxide | molecular mass](../image_source/4ea9966f414901b0f2a4624e5f6a81fd.png)
mercuric oxide | molecular mass
Result
![Find the molecular mass, m, for mercuric oxide: 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: HgO Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Hg (mercury) | 1 O (oxygen) | 1 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 Hg (mercury) | 1 | 200.592 O (oxygen) | 1 | 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 Hg (mercury) | 1 | 200.592 | 1 × 200.592 = 200.592 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 m = 200.592 u + 15.999 u = 216.591 u](../image_source/88778c531db00992ce7571b25c8b99af.png)
Find the molecular mass, m, for mercuric oxide: 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: HgO Use the chemical formula to count the number of atoms, N_i, for each element: | N_i Hg (mercury) | 1 O (oxygen) | 1 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 Hg (mercury) | 1 | 200.592 O (oxygen) | 1 | 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 Hg (mercury) | 1 | 200.592 | 1 × 200.592 = 200.592 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 m = 200.592 u + 15.999 u = 216.591 u
Unit conversions
![216.591 Da (daltons)](../image_source/ca948d6173a384e4884e764dd8d56022.png)
216.591 Da (daltons)
![0.216591 kDa (kilodaltons)](../image_source/d032937c006949142a575b4ce4b8b1fa.png)
0.216591 kDa (kilodaltons)
![3.59658×10^-22 grams](../image_source/787722ca7ffeeb2adca46bf1ce6c5f3f.png)
3.59658×10^-22 grams
![3.59658×10^-25 kg (kilograms)](../image_source/f8b65e9fcaae227e883e4bd498b36d96.png)
3.59658×10^-25 kg (kilograms)
![216.6 chemical atomic mass units (unit officially deprecated)](../image_source/6ac9bacf4422b6ae31acf2fec93403e1.png)
216.6 chemical atomic mass units (unit officially deprecated)
![216.66 physical atomic mass units (unit officially deprecated)](../image_source/678aa4eda3b0761ffa7dc1210df485ff.png)
216.66 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ 0.3 × molecular mass of fullerene ( ≈ 721 u )](../image_source/c975d90c2d6965cca62266569d6d0184.png)
≈ 0.3 × molecular mass of fullerene ( ≈ 721 u )
![≈ 1.1 × molecular mass of caffeine ( ≈ 194 u )](../image_source/25221f80ffc0c422bb6e3f30aa38268d.png)
≈ 1.1 × molecular mass of caffeine ( ≈ 194 u )
![≈ 3.7 × molecular mass of sodium chloride ( ≈ 58 u )](../image_source/513a4a0283bcc18230e7f41b5f07a911.png)
≈ 3.7 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 217](../image_source/40475ca089d2620a6d1da73182b3110a.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 217
![Molar mass M from M = m_aN_A: | 217 g/mol (grams per mole)](../image_source/ad9d9af4f894f0f385282dd4bd991d91.png)
Molar mass M from M = m_aN_A: | 217 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 217](../image_source/7c63840dc82a0c509457ccf51e52412a.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 217
![Molar mass M from M = m_mN_A: | 217 g/mol (grams per mole)](../image_source/bfeaa57335473c40371c1d23340ac8b6.png)
Molar mass M from M = m_mN_A: | 217 g/mol (grams per mole)