Input interpretation
![rubidium fluoride | molecular mass](../image_source/dac0a9e0976c16e1b46b697d79b3320d.png)
rubidium fluoride | molecular mass
Result
![Find the molecular mass, m, for rubidium fluoride: 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: RbF Use the chemical formula, RbF, to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 1 Rb (rubidium) | 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 F (fluorine) | 1 | 18.998403163 Rb (rubidium) | 1 | 85.4678 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 F (fluorine) | 1 | 18.998403163 | 1 × 18.998403163 = 18.998403163 Rb (rubidium) | 1 | 85.4678 | 1 × 85.4678 = 85.4678 m = 18.998403163 u + 85.4678 u = 104.4662 u](../image_source/2a541c75b5943e21f7787f7abbfdc32e.png)
Find the molecular mass, m, for rubidium fluoride: 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: RbF Use the chemical formula, RbF, to count the number of atoms, N_i, for each element: | N_i F (fluorine) | 1 Rb (rubidium) | 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 F (fluorine) | 1 | 18.998403163 Rb (rubidium) | 1 | 85.4678 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 F (fluorine) | 1 | 18.998403163 | 1 × 18.998403163 = 18.998403163 Rb (rubidium) | 1 | 85.4678 | 1 × 85.4678 = 85.4678 m = 18.998403163 u + 85.4678 u = 104.4662 u
Unit conversions
![104.466 Da (daltons)](../image_source/b4a2cdee940c8c7f6aff4e484a155792.png)
104.466 Da (daltons)
![0.104466 kDa (kilodaltons)](../image_source/1fdf2356c731e905e7d14830cba3c9c5.png)
0.104466 kDa (kilodaltons)
![1.7347×10^-22 grams](../image_source/e8fab069d16e3539729320d155a18706.png)
1.7347×10^-22 grams
![1.7347×10^-25 kg (kilograms)](../image_source/649b72eefb59f1a048c753aff2994c9a.png)
1.7347×10^-25 kg (kilograms)
![104.471 chemical atomic mass units (unit officially deprecated)](../image_source/4e209f9b3de4e67a8d802025d4bf9fa1.png)
104.471 chemical atomic mass units (unit officially deprecated)
![104.499 physical atomic mass units (unit officially deprecated)](../image_source/437a893b46ddf997384aba38760f6be1.png)
104.499 physical atomic mass units (unit officially deprecated)
Comparisons as mass of molecule
![≈ ( 0.14 ≈ 1/7 ) × molecular mass of fullerene ( ≈ 721 u )](../image_source/38fcfd401c3c49b71e735560f2e3888e.png)
≈ ( 0.14 ≈ 1/7 ) × molecular mass of fullerene ( ≈ 721 u )
![≈ 0.54 × molecular mass of caffeine ( ≈ 194 u )](../image_source/3736d70f9474b83fee01af89716c6d11.png)
≈ 0.54 × molecular mass of caffeine ( ≈ 194 u )
![≈ 1.8 × molecular mass of sodium chloride ( ≈ 58 u )](../image_source/dfc3ce4cf4b00137defc1cc5fd36c220.png)
≈ 1.8 × molecular mass of sodium chloride ( ≈ 58 u )
Corresponding quantities
![Relative atomic mass A_r from A_r = m_aN_A/M_u: | 104](../image_source/1f421311fef946c8b4e1d336bda3f0a6.png)
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 104
![Molar mass M from M = m_aN_A: | 104 g/mol (grams per mole)](../image_source/4b23cbfe9af89226737855832d9b46f3.png)
Molar mass M from M = m_aN_A: | 104 g/mol (grams per mole)
![Relative molecular mass M_r from M_r = m_mN_A/M_u: | 104](../image_source/e6094c0fa55cb296f6df1b1c99686228.png)
Relative molecular mass M_r from M_r = m_mN_A/M_u: | 104
![Molar mass M from M = m_mN_A: | 104 g/mol (grams per mole)](../image_source/c005195fb2334d8c3ffcab93aeef8243.png)
Molar mass M from M = m_mN_A: | 104 g/mol (grams per mole)