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Q. If there are initially twice as many calcium atoms as there are barium atoms, what will be the ratio of calcium atoms to barium atoms 1.40 weeks later?

Q. A tank having a volume of 0.100 m3 contains helium gas at 135 atm. How many balloons can the tank blow up if each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.50 atm?

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