Input interpretation
![strontium nitrate | molar mass](../image_source/830377acc4e69c18325b427fec512bb8.png)
strontium nitrate | molar mass
Result
![Find the molar mass, M, for strontium nitrate: 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: Sr(NO_3)_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i N (nitrogen) | 2 O (oxygen) | 6 Sr (strontium) | 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) N (nitrogen) | 2 | 14.007 O (oxygen) | 6 | 15.999 Sr (strontium) | 1 | 87.62 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) N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 6 | 15.999 | 6 × 15.999 = 95.994 Sr (strontium) | 1 | 87.62 | 1 × 87.62 = 87.62 M = 28.014 g/mol + 95.994 g/mol + 87.62 g/mol = 211.63 g/mol](../image_source/3c6c88f60fa1cf25f5fa7b4b0f817c6f.png)
Find the molar mass, M, for strontium nitrate: 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: Sr(NO_3)_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i N (nitrogen) | 2 O (oxygen) | 6 Sr (strontium) | 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) N (nitrogen) | 2 | 14.007 O (oxygen) | 6 | 15.999 Sr (strontium) | 1 | 87.62 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) N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 6 | 15.999 | 6 × 15.999 = 95.994 Sr (strontium) | 1 | 87.62 | 1 × 87.62 = 87.62 M = 28.014 g/mol + 95.994 g/mol + 87.62 g/mol = 211.63 g/mol
Unit conversion
![0.2116 kg/mol (kilograms per mole)](../image_source/5dae381826ca7467ea0bf21ae1fa524d.png)
0.2116 kg/mol (kilograms per mole)
Comparisons
![≈ 0.29 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/2d8045d73271d786eddd98ec0da520ee.png)
≈ 0.29 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.1 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/09a34957b6618aeeae8e41e405f3de1f.png)
≈ 1.1 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 3.6 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/04397033197a41276bce37580d4dfd53.png)
≈ 3.6 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 3.5×10^-22 grams | 3.5×10^-25 kg (kilograms) | 212 u (unified atomic mass units) | 212 Da (daltons)](../image_source/076a88e0dd34deaedc64868b0cfb7801.png)
Mass of a molecule m from m = M/N_A: | 3.5×10^-22 grams | 3.5×10^-25 kg (kilograms) | 212 u (unified atomic mass units) | 212 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 212](../image_source/db715d066fb8e4222d9d84c6e9ea05be.png)
Relative molecular mass M_r from M_r = M_u/M: | 212