A sample of water,H₂O,has a mass of 38.0g) How many atoms of oxygen are in the sample? (oxygen has 16.0 g/mol,hydrogen has 1.00 g/mol,and N_A = 6.02 × 10²³)

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Quizplus · Accepted Answer

To find the number of oxygen atoms, we need to first determine the number of moles of oxygen in the sample. The molecular mass of water (H₂O) is: 1(1.00 g/mol) + 1(32.07 g/mol) + 16.00 g/mol = 18.02 g/mol Thus, the number of moles of water in the sample is: 38.0 g / 18.02 g/mol = 2.109 mol Since water has two hydrogen atoms and one oxygen atom, the number of moles of oxygen in the sample is: 2.109 mol x 1 mol of oxygen / 1 mol of water = 2.109 mol of oxygen Finally, we can calculate the number of oxygen atoms using Avogadro's number: 2.109 mol of oxygen x 6.02 × 10²³ atoms/mol = 1.27 x 10²⁴ atoms of oxygen.

​A Sample of Water,H2O,has a Mass of 38

A Sample of Water,H₂O,has a Mass of 38