Input interpretation
ammonium hydroxide | molar mass
Result
Find the molar mass, M, for ammonium hydroxide: 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: NH_4OH Use the chemical formula to count the number of atoms, N_i, for each element: | number of atoms H (hydrogen) | 5 N (nitrogen) | 1 O (oxygen) | 1 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | number of atoms | atomic mass/g·mol^(-1) H (hydrogen) | 5 | 1.008 N (nitrogen) | 1 | 14.007 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 molar mass, M: Answer: | | | number of atoms | atomic mass/g·mol^(-1) | mass/g·mol^(-1) H (hydrogen) | 5 | 1.008 | 5 × 1.008 = 5.040 N (nitrogen) | 1 | 14.007 | 1 × 14.007 = 14.007 O (oxygen) | 1 | 15.999 | 1 × 15.999 = 15.999 M = 5.040 g/mol + 14.007 g/mol + 15.999 g/mol = 35.046 g/mol
Unit conversion
0.035046 kg/mol (kilograms per mole)
Comparisons
≈ ( 0.18 ≈ 1/6 ) × molar mass of caffeine (≈ 194 g/mol )
≈ 0.6 × molar mass of sodium chloride (≈ 58 g/mol )
≈ 1.9 × molar mass of water (≈ 18 g/mol )
Corresponding quantities
Mass of a molecule m from m = M/N_A: | 5.8×10^-23 grams | 5.8×10^-26 kg (kilograms) | 35 u (unified atomic mass units) | 35 Da (daltons)
Relative molecular mass M_r from M_r = M_u/M: | 35