In this worksh Workshop 13: Gas Laws such experiments n will discuss a when we s

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In this worksh Workshop 13: Gas Laws such experiments n will discuss a when we so called quickly test hypothesis. often employ science we In this we everyday life series of want to thought experiments We would follow up with a lab experiment or calculations to confirm our conclusions. workshop n for pwe will use thought experiments to discuss the gas laws. In 1834 Emile the first time formulate the Law: We PV nRT, where Mw m/n and R 0.08206 L atm/mol-K will deal a 1.50 g sample of diatomic gas initially in 1.20 L balloon at 307 in Hg and 27oC. with 1. Let's start by [For exams you don't need to remember the individual gas laws] determining the identity of this gas. Hint you need to use the ideal gas law. The gas inside the balloon is 2. Charles's law. You put this balloon in your freezer where it is -30°C. When you open the freezer in half an hour, what do you expect to see what will happen to the balloon's volume Discuss this with your group. (a) The volume of this balloon wi (increase/decrease) lslightly dramatically). In this experiment Opressure/emperature/amount of gas (islane) Constant. (b) Calculate the new volume using the ideal gas law. (c) Now explain the change in volume from behavior of the gas molecules (d) Fill in the blanks Charles's law (the law of volumes, 1787): For a given amount (moles) of an ideal gas at constant to its absolute pressure, the volume is temperature

Explanation / Answer

Q1.

for the identity of the gas:

PV = nRT

n = mass/MW

MW = molar weight of compound

so

PV = masS/MW * RT

MW = mass*RT/(PV)

substitute all data

T = 27°C = 300 K; R = 62.4

MW = mass*RT/(PV)

P = 30.7 in = 30.7*2.54 = 77.978 cm = 779.78 mm

MW = 1.50*62.4*300/(1.2*779.78 ) = 30.0084 g/mol

this could be NO --> nitrogen monoxide

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