Directions: You must use only your notes and textbook. You may collaborate with

Question

Directions: You must use only your notes and textbook. You may collaborate with your classmates. If you use the internet for any reason relating to this assignment, then you will receive a zero. YOU MUST SHOW ALL YOUR WORK OR NO CREDIT WILL BE GIVEN FOR PROBLEMS An ideal gas originally at 0.85 atm and 66"C was allowed to expand until its final volume, pressure, and temperature were 94 mL, 0.60 atm, and 45, respectively, what was its initial volume? 1. 2. At STP, 0.280 L of a gas weighs 0.400 g. Calculate the molar mass of the gas. 3. A 2.10-L vessel contains 4.65 g of a gas at 1.00 atm and 27.00. a. Calculate the density of the gas in grams per liter b. What is the molar mass of the gas?

Explanation / Answer

Ans 1 : Using the ideal gas law , pV = nRT , we get the relation as :

p1V1T2 = p2V2T1

p1 = 0.85 atm

p2 = 0.60 atm

V1 =

V2 = 0.094 L

T1 = 339.15 K

T2 = 318.15 K

So putting all the values we get :

0.85 x V1 x 318.15 = 0.60 x 0.094 x 339.15

V1 = 0.071 L

So the initial volume will be 71 mL

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