# Chapter 7 - Chapter 7 7.6 the combined gas law p1 v1/T1=...

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Chapter 7 7.6 the combined gas law p1 v1/T1= p2v2/T2 no change in moles this law sums up the pressure Volume & moles (avogadro’s law)- state thate the volume of a gas is directly related to the number of moles f gas when pressure and temperatire are not changed V1/n1=v2/n2 (no change in pressure and temperature Ex) 8g of 02 has v=5.00ml what is volume in liters of 8g of oxygn added to the initial 8g of 02. V1= 5.00L n1=8g/ 2(18)= 8/32=1/4 = 0.25 8+8=16 N2= 16/32=0.5 V1/n1= v2/n2, 5.ool/0.25= v2/0.5 V2=5.00L/0.25 x 0.5= 10.0L Pg 279 Standard temperature and pressure STP- is useful to make comparisons between different gases. Standard te,perature= 273 K and pressure =later =760 mmhG) At STP 1 mole of gas occupies 22.4L Volume of 22.4 L of any gas at STP is called molar volume Ex- what is the volume of 64.0g of 02 at STP? @ 1 mole of 02 occupies 22.4 L N= mass/m x m, n02= 64og/32g= 2 moles 02 2 moles of 02 occupies 2(22.4L)= 44.8L Ideal gas Law- pv=n Rt R= gas constant R= 0.0821= liter/mole K you use this when pressure is in atom R = 62.4L mmHG/ mole k

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