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Analysis of a newly discovered gaseous silicon-fluorine
Chapter 6, Problem 83P(choose chapter or problem)
Analysis of a newly discovered gaseous silicon-fluorine compound shows that it contains 33.01 mass % silicon. At 27°C, 2.60 g of the compound exerts a pressure of 1.50 atm in a 0.250-L vessel. What is the molecular formula of the compound?
Questions & Answers
QUESTION: Problem 83P
Analysis of a newly discovered gaseous silicon-fluorine compound shows that it contains 33.01 mass % silicon. At 27°C, 2.60 g of the compound exerts a pressure of 1.50 atm in a 0.250-L vessel. What is the molecular formula of the compound?
ANSWER:
Solution 83P
Here we have to find out the molecular formula for silicon-fluorine compound.
Step 1
Given:
Mass = 2.60 g
Volume = 0.250 L
Pressure = 1.50 atm
R = 0.0821 L atm mol-1 K-1
The molar mass of silicon fluoride compound can be calculated by using ideal gas equation as follows,
M =
= = 170.77 g/mol
Now the % of F present can be calculated as, 33.01 % Si - 100 = 66.99 % F
Hence we can say that the compound contain 33.01g of Si and 66.99 g of F.