Question

periodic table
how many moles of helium would you find in a birthday balloon that had a volume of 6.2 l? assume conditions are at stp
a 12 moles
b. 22.4 moles
c. 3.6 moles
d. 0.28 moles

Explanation:

Step1: Recall the molar volume at STP

At STP (Standard Temperature and Pressure), the molar volume of any ideal gas is \(22.4\ \text{L/mol}\). The formula to find the number of moles \(n\) is \(n=\frac{V}{V_m}\), where \(V\) is the volume of the gas and \(V_m = 22.4\ \text{L/mol}\) is the molar volume.

Step2: Substitute the given values

We are given \(V = 6.2\ \text{L}\) and \(V_m=22.4\ \text{L/mol}\). Substituting these values into the formula \(n=\frac{V}{V_m}\), we get \(n=\frac{6.2\ \text{L}}{22.4\ \text{L/mol}}\).

Step3: Calculate the number of moles

\(n=\frac{6.2}{22.4}\approx0.28\ \text{mol}\)

Answer:

D. \(0.28\) moles