Boyle’s+Law.R.Stacey

The first gas law we are going to look at is Boyle's law. in 1662 Robert Boyle discovered that pressure and volume are mathematically related. Doubling pressure on a sample of gas at constant temperature reduces volume by one-half. This law and equation deals with the relationship between Pressure and volume. If the volume goes up, then the pressure goes down, and vise versa. A.  Boyle’s Law : As stated in the book: //Boyle’s law states that the volume of a fixed mass of gas varies inversely with the pressure at a constant temperature.// When you shrink the volume, the pressure increases. When you shrink the pressure, the volume increases. In this law, volume and pressure are proportional, they change in opposite directions. Meaning that if one goes up, the other will go down. Constant: Volume Equation: PInitial x VInitial = PFinal x VFinal

Example Problem: A sample of oxygen gas has a volume of 150 mL when its pressure is 0.947 atm. What will the volume of gas be at pressure of 0.987 atm if the temperature remians constant? (pg. 370 Chem textbook) P1V1=P2V2 Given: V1 of O 2 = 150 mL P1 of O 2 = .987 atm Unknown V2 of O 2. P2    P2  0.987 atm Pictures:
 * First, it is important to write down all of the information you are given in a problem. Then, you will know how to set up the equation and solve for the unknown.
 * Once you know what you are looking for, you need to se the equation up to find the unknown. In this case, we are looking for V2. OYu would do this algebraically to isolate the variable.
 * So, you find that the equation is: V2 = __P1V1__
 * Then, you plug the values in and set the equation up:
 * V2 = __P1V1__= __(0.947 atm)(150.0 mL O 2)__ = 144 mL of O 2



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