DO NOW Turn in your blue Big Chill sheet. Is your project on the back desk? Is your name on it? No blue sheet? Get a white one and fill it out. Get out your handout and notes from yesterday.

“R” is the universal gas constant. IDEAL GAS LAW Ideal Gas Equation: PV = nRT “R” is the universal gas constant.

UNIVERSAL GAS CONSTANTS R = 0.0821 L• atm mol • K R = 62.4 L•mm Hg mol • K R = 62.4 L • torr R = 8.31 L • kPa Why are there four constants?

IDEAL GAS LAW Remember: Always change the temperature to KELVINS and convert volume to LITERS. Check the units of pressure to make sure they are consistent with the “R” constant given or convert the pressure to the gas constant (“R”) you want to use.

IDEAL GAS LAW PRACTICE: How many moles of a gas at 100.0°C does it take to fill a 1.00L flask to a pressure of 1.50atm? V = PV = nRT T = P = R = n =  

IDEAL GAS LAW PRACTICE: What is the volume occupied by 9.45mol of C2H2 at STP? PV = nRT P = R = V = N = T =

HOMEWORK Playing with Cans and Balloons lab due Monday. Handout due Monday.