HELP ME PLEASE!! CHEMISTRY ASSIGNMENT! CONFUSED AND LOST?

1. what is the relationship between the kinetic energy (temp) and the pressure of a gas?

Increase temp, increase KE, increase pressure.

See formula: PV/T=P2V2/T2...since volume is constant, remove V and V2...P/T=P2/T2

6. If the volume of a container drops from 2500mL to 1500mL, witth an initual temperature of -20°C, what was its final temp?

See Formula: PV/T=P2V2/T2 assume pressure is 1atm, a constant. Convert mL to L and C to K (273.3-20)

1atm(2.5L)/253.3K=1atm(1.5L)/T2=151.98K or -121..3C...and in correct Significant figures: 120C

7. Originally, the pressure of a container is 3atm and the temp. is 0°C. if the temperature becomes 100°C, what will the new pressure become?

P/T=P2/T2: 3atm/273.3K=P2/373.3K=4.1atm or 4atm to correct significant figures

8. Initially, the pressure is 2 atm while the volume is 3L. what is the new pressure when the volume becomes 12L?

PV=P2V2 2atm(3L)=P2(12L) P2= .5atm

9. 1 Mole of gas has a volume of 22.4L at 0°C and 1 atm. what does the volume become when the temperature of the same gas is raised to 25°C?

PV/T=P2V2/T2 1atm(22.4L)/273.3K=P2(22.4L)/298.3K=1.09atm

10. at 25°C and 760mmHG a volume of 159.25L would contain how many moles of gas?

760mmHg=1atm R=universal gas constant= .08206 atmL/molK

PV=nRT 1atm(159.25L)=n(.08206atmL/molK)(298.3K)= 6.51mol

11. If a balloon at room temp (25°C) is blown up to a volume of 10L and the temp is raised to 40°C, what will the new volume of the balloon become?

V/T=V2/T2

10L/298.3K=V2/313.3K= 10.5L

REMEMBER: you can use the formula PV/T=P2V2/T2 for pretty much any of these problems!! Simply eliminate any factors not being used! For example, if you aren't using a changing temperature, make the equation PV=P2V2

PV=nRT is used for determining something where moles of the substance is needed.

For both, remember temperature is in KELVIN, pressure is in ATM, and volume is in L. This will make your life so much easier, if you follow these simple rules!!

What did you do with all the answers I spent ages giving you??