How many liters of chlorine gas can be produced when 0.98 L of HCl react with excess O2 at STP?
4HCl(g) + O2 (g) -> 2Cl2 (g) + 2H2 O(g)
a. 0.98 L
b. 0.49 L
c. 3.9 L
d. 2.0 L
Answer: B
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