If a sample of air contains 0.78 g nitrogen, 0.52 g oxygen, and 0.13 g carbon dioxide, what percentage of the gas is oxygen?
21.0%
0.364%
52.0%
36.4%
To find the percentage of the gas that is oxygen, we need to calculate the total mass of the gases in the sample first.
The total mass of the gas in the sample is:
0.78 g (nitrogen) + 0.52 g (oxygen) + 0.13 g (carbon dioxide) = 1.43 g
To find the percentage of the gas that is oxygen, we can divide the mass of oxygen by the total mass of the gases and multiply by 100.
Percentage of oxygen = (0.52 g / 1.43 g) x 100 = 36.4%
Therefore, the percentage of the gas that is oxygen is 36.4%.
To find the percentage of oxygen in the gas sample, we need to calculate the total mass of the gas and then determine the proportion that is due to oxygen.
The total mass of the gas can be found by summing the masses of nitrogen, oxygen, and carbon dioxide:
Total mass of the gas = mass of nitrogen + mass of oxygen + mass of carbon dioxide
Total mass of the gas = 0.78 g + 0.52 g + 0.13 g = 1.43 g
Now, we can determine the proportion of the gas that is due to oxygen.
Percentage of oxygen = (mass of oxygen / total mass of the gas) * 100
Percentage of oxygen = (0.52 g / 1.43 g) * 100
Percentage of oxygen = 36.4%
Therefore, the percentage of oxygen in the gas sample is 36.4%.