Question

50 БАЛЛОВ!!! Этанол подожгли на воздухе. Определите, какой объём воздуха необходим для получения 2,26 л углекислого газа? Считайте объёмную долю кислорода в воздухе равной 21%. Объёмы всех газов измерены при одинаковых условиях.

Answer 1

Ответ:

16

Объяснение: это из фоксфорда

Answer 2

Calculating the Volume of Air Needed to Produce Carbon Dioxide from Burning Ethanol

To calculate the volume of air needed to produce 2.26 liters of carbon dioxide from burning ethanol, we can use the balanced chemical equation for the combustion of ethanol:

C2H5OH + 3O2 → 2CO2 + 3H2O

From this equation, we can see that 1 mole of ethanol (C2H5OH) reacts with 3 moles of oxygen (O2) to produce 2 moles of carbon dioxide (CO2) and 3 moles of water (H2O).

Given that the volume of all gases is measured under the same conditions, we can use the molar volume of a gas at standard temperature and pressure (STP), which is approximately 22.4 liters per mole.

Calculation Steps:

1. Calculate the moles of carbon dioxide produced from 2.26 liters of carbon dioxide. 2. Use the mole ratio from the balanced chemical equation to find the moles of oxygen required. 3. Convert the moles of oxygen to liters using the molar volume of a gas at STP.

Step 1: Calculate Moles of Carbon Dioxide Produced

The molar volume of a gas at STP is approximately 22.4 liters per mole. Therefore, the moles of carbon dioxide produced can be calculated as:

moles of CO2 = volume of CO2 / molar volume at STP

moles of CO2 = 2.26 L / 22.4 L/mol

Step 2: Use Mole Ratio to Find Moles of Oxygen

From the balanced chemical equation, we know that 1 mole of ethanol reacts with 3 moles of oxygen to produce 2 moles of carbon dioxide. Therefore, the moles of oxygen required can be calculated using the mole ratio:

moles of O2 = (moles of CO2 * 3) / 2

Step 3: Convert Moles of Oxygen to Liters

Finally, we can convert the moles of oxygen to liters using the molar volume of a gas at STP:

volume of O2 = moles of O2 * molar volume at STP

volume of O2 = (moles of CO2 * 3 / 2) * 22.4 L/mol

Answer:

By following these steps, we can calculate the volume of air needed to produce 2.26 liters of carbon dioxide from burning ethanol.