Interpretation: The mass of helium needed to inflate a 5.50 L balloon at STP should be calculated.
Concept Introduction: A factor that uses one set of units to change it to another set of units is said to be a conversion factor.
Answer to Problem 94A
The mass of helium needed to inflate a 5.50 L balloon at STP is
Explanation of Solution
The molar volume of any compound at STP is 22.4 L for 1 mol of the compound.
The required conversion factor is:
On solving,
Thus, the number of moles for 5.50 L balloon at STP filed with helium is
Now, converting the obtained number of moles to mass using conversion factor:
Molar mass of helium is 4 g/mol. So,
Hence, the mass of helium needed to inflate a 5.50 L balloon at STP is
Chapter 10 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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