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?
• 36.4%
O 0.364%
O 21.0%
• 52.0%
To find the percentage of oxygen in the gas, we need to find the total mass of the gas and then calculate the mass of oxygen as a proportion of the total mass.
The total mass of the gas is 0.78 g + 0.52 g + 0.13 g = 1.43 g.
The mass of oxygen is 0.52 g.
To find the percentage, we divide the mass of oxygen by the total mass and multiply by 100:
(0.52 g / 1.43 g) * 100 = 36.4%
So, the percentage of the gas that is oxygen is 36.4%.
To find the percentage of oxygen in the gas sample, follow these steps:
1. Calculate the total mass of the gas sample:
Total mass = mass of nitrogen + mass of oxygen + mass of carbon dioxide
Total mass = 0.78 g + 0.52 g + 0.13 g = 1.43 g
2. Calculate the percentage of oxygen:
Percentage of oxygen = (mass of oxygen / total mass) × 100%
Percentage of oxygen = (0.52 g / 1.43 g) × 100% ≈ 36.36%
So, the correct answer is 36.4%.