A gas has a volume of 5.0 L at a pressure of 50 kPa. Solve for V2 when temperature is held constant and the pressure is increased to 125 kPa.

a. 12.5 L

b. 0.2 L

c. 2.0 L

d. 1250.0 L

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Boron has an average mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of the two isotopes?

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