Agenda •Grade test •Turn in Homework •Peanut Lab

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

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

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

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

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

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

Problem Section 21.PV=nRT (1) 9.38 gMg 3 N 2 /100.9 g / mol =.0930 molMg 3 N 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

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

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

Peanut Lab