Question 6.ex.2: How many moles are contained in 2.0 L of N2 at standard temp...

Step [1] Identify the known quantities and the desired quantity.

2.0 L of N_{2}     ? moles of N_{2}
original quantity      desired quantity

Step [2] Write out the conversion factors.
• Set up conversion factors that relate the number of moles of a gas to volume at STP. Choose the conversion factor that places the unwanted unit, liters, in the denominator so that the units cancel.

Step [3] Solve the problem.
• Multiply the original quantity by the conversion factor to obtain the desired quantity.