Question

В состав воздуха входит 21% кислорода и 78% азота по объёму. Расчитать сколько грамм кислородасодержится в 50 литров воздуха при н.у.

Answer 1

50л*0,21=10,5 л 10,5/22,4=0,46875 моль *32=15 г

Answer 2

Calculation of Oxygen Content in 50 Liters of Air at Standard Conditions

To calculate the amount of oxygen in 50 liters of air at standard conditions, we need to know the percentage of oxygen in air and the molar volume of gas at standard conditions.

According to the information provided, air consists of 21% oxygen and 78% nitrogen by volume.

To calculate the amount of oxygen in 50 liters of air, we can use the following steps:

1. Calculate the volume of oxygen in 50 liters of air: - Oxygen volume = 50 liters * 21% = 10.5 liters

2. Convert the volume of oxygen to moles: - To convert the volume of oxygen to moles, we need to know the molar volume of gas at standard conditions. The molar volume of gas at standard conditions is approximately 22.4 liters per mole. - Moles of oxygen = Oxygen volume / Molar volume of gas at standard conditions - Moles of oxygen = 10.5 liters / 22.4 liters per mole ≈ 0.46875 moles

3. Calculate the mass of oxygen in grams: - To calculate the mass of oxygen, we need to know the molar mass of oxygen. The molar mass of oxygen is approximately 32 grams per mole. - Mass of oxygen = Moles of oxygen * Molar mass of oxygen - Mass of oxygen = 0.46875 moles * 32 grams per mole ≈ 15 grams

Therefore, there are approximately 15 grams of oxygen in 50 liters of air at standard conditions.

Please note that the values used in this calculation are approximate and may vary slightly depending on the specific conditions and composition of air.