What is the number of moles of 500 liters of he gas at stp?
a) 0.2 mol
b) 90 mol
c) 0.05 mol
d) 22 mol

The correct answer is D

Explanation:

Step 1: Data given

Volume of helium = 500 L

STP:

⇒ 25°C = 298 Kelvin

⇒ 1.00 atm

⇒ 22.4 L

This means 1 mole of Helium gas at STP has a volume of of 22.4 L

Since 22.4 L of Helium gas = 1 mol

Then 500 L of helium gas = (500L/ 22.4L) * 1 mol = 22.3 mol

The correct answer is D

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

answer seismograph;