Question

What is the mass of 5.50 L of ethane (C₂H₄) gas at STP? Use atm as the standard pressure unit.

Answer 1

The mass of 5.50 L of ethane gas at STP can be calculated by dividing the volume by the molar volume at STP, then multiplying by ethane's molar mass.

Step-by-step explanation:

To calculate the mass of 5.50 L of ethane (C2H4) gas at STP, we must use the ideal gas law. At STP, one mole of any ideal gas occupies 22.414 L. Therefore, we can find the number of moles of ethane in 5.50 L, and then use its molar mass to find out the mass.

Here are the steps for the calculations:

1. Calculate the number of moles of ethane using its volume at STP:

(5.50 L) / (22.414 L mol-1) = number of moles of ethane

1. Multiply the number of moles by the molar mass of ethane (30.07 g mol-1) to find the mass:

Number of moles of ethane * (30.07 g mol-1) = mass of ethane