Assuming that all of the gas in the tank in the figure is used to fill balloons with an average volume of 2.0 L of helium, approximately how many balloons could be filled at STP? 
A) about 45 balloons
B) about 106 balloons
C) about 210 balloons
D) about 850 balloons
E) about 1200 balloons
Correct Answer:
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