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Helium-filled Balloon Pressure

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Keith wants a large helium balloon, his mom can only fit 10.0 L in her small car. The temperature outside is 17.0 The balloon has a mass of 500 g He. What pressure should she have the balloon filled with helium?
a) 0.114 kPa
b) 2.98 104 kPa
c) 1.95 kPa
d) 1.14 kPa

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