Final answer:
The volume of a 7-mole sample of CO2 at Standard Temperature and Pressure (STP) is calculated by multiplying the number of moles by the molar volume of a gas at STP, which results in 156.8 liters.
Step-by-step explanation:
Calculating the Volume of CO2 Gas at STP
To calculate the volume of a 7-mole sample of CO2 gas at Standard Temperature and Pressure (STP), we can use the molar volume of an ideal gas. At STP (0 °C and 1 atmosphere of pressure), one mole of an ideal gas occupies 22.4 liters. Thus, to find the volume of a 7-mole sample, we simply multiply the number of moles by the molar volume:
V = n × molar volume
V = 7 moles × 22.4 L/mole
V = 156.8 L
Therefore, a 7-mole sample of CO2 occupies 156.8 liters at STP.