General Chemistry questions

[lan418]

I've been working on these problems for some time. However, i havent been able to rationalize the answer for the following problems.

 

1. A 95.0 mL sample of He(g) is collected over water at 765 Torr and 56 degrees C. If, at these conditions, the "dry" V of this He(g) sample is 79.6 mL, the VP of water at 56 degrees C is closest to

 

1. 94.5 torr

2. 46.9 torr

3. 79.5 torr

4. 153.3 torr

5. 123. 8 torr

 

2. If water is saturated with a mixture of N2 (g) and a second gas at STP to give a solution which freezes at -0.00184 degrees X, and x(greek letter symbol chi) = 0.45 for N2 (g) above the water, the Henry's constant for the second gas is closest to

 

1. 9.6 x 10 E-4 mol/L atm

2. 2.2 x 10 e-3 mol/L atm

3. 5.5 x 10E-4 mol/L atm

4. 2.6 x 10 E -3 mol/L atm

5. 1.7 X10 e-3 mol/L atm

 

3. If a sample of an ideal gas in a closed flask exerts a P(pressure) of 560 torr at 125 degrees X and a P of 960 torr at 250 degrees X and T in degrees X varies linearly as a function of Delta P, absolute zero in degrees X is closest to

 

1. -125 degrees X

2. -25 degrees X

3. -75 degrees X

4. -100 degrees X

5. 50 degrees X

[insane_alien]

1. PV=nRT and then Pt = PP1+PP2+..+PPn

2.no idea

3. PV=nRT

 

hope you didn't expect me to give you the answers

[lan418]

Nope. Your suggustions won't work.