1. Agenda •Grade test •Turn in Homework •Peanut Lab

2. Test 1.Nothing 2.Standard Temp and Pressure 3.Faster 4.A 5.D 6.C 7.C 8.D 9.A 10.C 11.B 12.C 13.B 14.B 15.B

3. Problem Section 16. PV=nRT (1) (2515torr)(.250L)=n(62.4 torr*L / K*mol )(300K) (1).0336mol * 28 g / mol =.940 g (3) Sig figs, answer, unit

4. Problem Section 17.P T =P 1 +P 2 … (1) (750mmHg)(.78N 2 )= P 1 (1) (750mmHg)(.21O 2 )= P 2 (750mmHg)(.01Ar)= P 3 P 1 =585.0mmHg P 2 =157.5mmHg P 3 =7.5mmHg (3) Sig figs, answer, unit

5. Problem Section 18. PV=nRT (1) (50.6kPa)(10L)=n(8.31 kPa*L / K*mol )(200K) (1).304mol * 6.02 EE 23 molecules / mol = (3) 1.83 EE 23 molecules Sig figs, answer, unit

6. Problem Section 19. √MM b =Time b (1) MM a Time a √71 g / mol =Time b (1) 40 g / mol 120s x = 160s (3) Sig figs, answer, unit

7. Problem Section 20. PV=nRT (1) (P)(.200L)=(4.00 mol )(.0821 atm*L / K*mol )(293K)(1) 481atm (3) Sig figs, answer, unit

8. Problem Section 21.PV=nRT (1) 9.38 gMg 3 N 2 /100.9 g / mol =.0930 molMg 3 N 2.0930 molMg 3 N 2 * 4 molNH 3 /2 molMg 3 N 2 =.186 mol (784 mmHg )(V)=(.186 mol )(62.4 mmHg*L / K*mol )(298 K ) (1) 4.41 L (3) Sig figs, answer, unit

9. Problem Section 22. √MM b =Volume a (1) MM a Volume b √x g / mol =25.0mL (1) 38 g / mol 15.0mL X=106 g / mol (3) Sig figs, answer, unit

10. Skip 23-29

11. Phase Diagram 30. White board 31.Melt 32.Increase the temperature or decrease the pressure 33.Decrease temperature and pressure 34.Increase pressure

12. Peanut Lab