Lec-24-Chap-10-3

Lec-24-Chap-10-3 - The Ideal Gas Law The ideal gas law is a...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The ideal gas law ideal gas law is a combination of: The Ideal Gas Law IDEAL GAS LAW PV = nRT or V = nRT P Boyle’s Law V 1 P fixed n and T Avogadro’s Law V n fixed P and T Charles’s Law V T fixed n and P The Ideal Gas Law STP (standard temperature and pressure) Standard T = 273.15 K (0°C = 32°F) Standard P = 1 atm At STP: One mole of a gas occupies 22.414 22.414 L (Easily calculated using V = nRT / P = . .. ) Ideal Gas Law Example What volume will 2.64 mol of N 2 occupy at 0.640 atm and 31.0°C? If 3 variables are known, use the ideal gas law to get the 4 th . PV = nRT V = nRT / P V =(2.64 mol)(0.08206 L atm K -1 mol -1 )(31.0+273.15K) (0.640 atm) V = 103. L choose R so that the units will cancel change to absolute T Gases in Chemical Reactions Consider: 2 C 8 H 18 ( l ) + 25 O 2 (g) 16 CO 2 (g) + 18 H 2 O( l ) 1.0 L of O 1.0 L of O 2 and excess octane react. and excess octane react. V CO2 produced? produced? Stoichiometry and Law of combining volumes. 25 mol O 2 16 mol CO 2 ; 25 L O 2 16 L CO 2 V CO2 = 1.0 L O 2 x (16 L CO 2 / 25 L O 2 ) = 0.64 L CO 2 100. g of octane burns at STP. 100. g of octane burns at STP. V O2 required? required? 100 g octane = 0.8754 mol octane 0.8754 mol octane x (25 O 2 / 2 octane) = 10.94 mol O 2 STP volume: 1 mol occupies 22.41 L V O2 = 10.94 mol O 2 x 22.41 L/mol = 245. L Gases & Chemical Reactions Consider: 2 C 8 H 18 ( l ) + 25 O 2 (g) 16 CO 2 (g) + 18 H 2 O( l ) V O2 = nRT = (125. mol)(62.36 L torr K -1 mol -1 )(298.2 K) P (752 torr) What What V of O of O 2 at 752 torr and 25.0
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Lec-24-Chap-10-3 - The Ideal Gas Law The ideal gas law is a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online