Sparks CH301 Gas Laws Day 4 Important Information LM 07 & 08 - PowerPoint PPT Presentation

Sparks CH301 Gas Laws Day 4

Important Information LM 07 & 08 and HW 3 – DUE WED 8:45 AM HW2 & LM06 WERE DUE THIS MORNING 8:45 AM

QUIZ QUESTION: INDIVIDUAL WORK, POINTS FOR CORRECT ANSWER Which has a higher molar volume, an ideal gas or liquid water, which has a density of 1 g/ml? A) Ideal gas B) Liquid water

Which has a greater density? A) Ideal gas B) Liquid water

What are we going to learn today? • Expand our use of the ideal gas equation beyond just plugging in numbers. – Determine densities – Determine molar masses – Use in stoichiometry

USEFULLNESS? PV = nRT • Given 3 properties of the state, calculate the 4 th . • Predicts what about the number density (moles per volume) of gases at same P and T? • What can you say about the molar volume (volume per one mole) of different gases at same P and T? • What can you say about the mass densities of different gases at same P and T? • Given P, T and molar mass – calculate mass density of a gas. • Given P, T and density – calculate the molar mass of a gas.

Polling Question: Group work Which balloon has the higher number density? (Same P, T) A. Ar B. He C. they are the same

Polling Question: Group work Which balloon has the higher mass density? (Same P, T) A. Ar B. He C. they are the same

Polling Question: Group work We have two identical containers held at the same T, one contains Ar, one contains He. The containers have the same mass density. Which has the higher pressure? A. Ar B. He C. they are the same

Group work QUIZ: Points for correct answer The oil produced from eucalyptus leaves contains the volatile organic compound eucalyptol. At 190 ºC and 60.0 Torr, a sample of eucalyptol vapor had a density of 0.320 g*L -1 . Calculate the molar mass of eucalyptol.

Group work QUIZ: Points for correct answer The oil produced from eucalyptus leaves contains the volatile organic compound eucalyptol. At 190 ºC and 60.0 Torr, a sample of eucalyptol vapor had a density of 0.320 g*L -1 . Calculate the molar mass of eucalyptol.. a)63 g/mol b)154 g/mol c)0.01 g/mol d)10 g/mol

Group work QUIZ: Points for correct answer • Calculate the density of CO 2 gas at 1.25 atm and 300 K.

Using Gas Laws in Stoichiometry Problems Consider the combustion of methanol, CH 4 , at STP.

• If 15 L gas phase methanol at P=1 atm and T=25°C reacts with excess oxygen in a combustion reaction, what volume of water vapor will be produced?

If 5 L O 2 reacts with 6 L H 2 , how many liters of water vapor could be produced?

Calculate the volume of carbon dioxide, adjusted to 25 ºC and 1.0 atm , that plants need to make 1.00 g of glucose. 6CO 2 (g) + 6H 2 O (l)  C 6 H 12 O 6 (s)+ 6O 2 (g)

What did we learn today? CONCEPT OF NUMBER DENSITY vs MASS DENSITY UTILIZING PV=nRT TO DETERMINE DENSITY AND MOLAR MASS STOICHIOMETRY WITH GAS LAWS

DAY 3 LEARNING OUTCOMES Perform calculations using the ideal gas equation Explain the relationship between the number density and the mass density for a given gas Use the ideal gas law to determine MW of a gas Use the ideal gas law to determine MW density a gas Apply the concept of the gas laws to gas phase reactions and perform stoichiometric calculations Using the gas properties, masses, moles, limiting reagents and percent yields