Zero
In one mole of hydrogen peroxide (H2O2), there are two moles of oxygen atoms.
1 mole CaCO3 (3 mole O/1 mole CaCO3) = 3 moles oxygen
Since quinine has a nitrogen atom in its chemical formula, 1 mole of quinine contains 1 mole of nitrogen atoms. Therefore, in 2.5 x 10^-2 moles of quinine, there are also 2.5 x 10^-2 moles of nitrogen atoms.
1.38 moles of nitrogen equal16,62110876532.1023 atoms; the molecule of nitrogen is diatomic.
To find the mole fraction of oxygen, you first need to calculate the number of moles of each element. The molar mass of nitrogen is 14 g/mol and oxygen is 16 g/mol. Then, divide the moles of oxygen by the total moles of both elements (oxygen + nitrogen) and multiply by 100 to get the mole percentage of oxygen.
There are 10 moles of oxygen in one mole of P4O10. This is because each molecule of P4O10 contains 4 phosphorus atoms and 10 oxygen atoms.
12.8 grams oxygen (1 mole O/16.0 grams) = 0.800 moles of oxygen
Each mole of ammonia requires one mole of nitrogen atoms. However, the nitrogen in the air occurs as diatomic molecules; therefore, only one-half mole of molecular nitrogen is required for each mole of ammonia.
Divide the larger by the smaller mole number. The smaller mole number is assumed to be 1. 0.40/0.20 = 2 As nitrogen is 0.20 moles we have 1 atom of it and 2 atoms of oxygen, so NO2 is the empirical formula (nitrogen dioxide).
12 moles KClO3 (3 moles O/1 mole KClO3) = 36 moles of oxygen.
0,75 moles of nitrogen
In one molecule of H2O, there are 2 moles of hydrogen (H) and 1 mole of oxygen (O).