Avogadro's Law

Avogadro's Law

AVOGADROS LAW W H AT I S AVO G A D R O S L AW Avogadros Principle equal volumes of gases at the same temperature and pressure contain equal numbers of particles AVOGADROS FORMULA * n represents the amount of gas

V1= V2 n1 n2 This is a direct relationship! So if the amount of gas increases, then the volume increas will ___________. If the amount of gas decreases, then e decrea

these volume will __________. G R A P H F O R AV O G A D R O S L AW What Laws have we learned were also direct relationships, in which their graphs were similar to Avogadros? AVOGADROS LAW Molar Volume for a gas is the volume that one mole of that gas occupies at STP Avogadro showed experimentally that 1

mole of any gas will occupy a volume of 22.4L at STP **Conversion Factor: 1 mol (any AV O G A D R O S L AW: E XA M P L E 1 Calculate the volume that 0.881 moles of oxygen gas at STP will occupy. A V O G A D R O S L A W: EXAMPL E 1 ANSWER Formula:

V1 = ? L n1 = 0.881 mol O2 V2 = 22.4 L n2 = 1 mol O2 V1 = V2 n1at STP: n2 Remember, 22.4 L/mol

V1 .881 mol O2 = 22.4 L 1 mol O2 ---------After---------cross multiplying you end -------------------up with V1(1 mol O19.7 = L (22.4 L)(.881

2) mol O2) 1 mol O2 1 mol O2 V1 = ___________ AV O G A D R O S L AW: E XA M P L E 2 How many grams of N2 will be contained in a 2.0 L flask at STP? (Remember- one mole WEIGHS the formula mass in grams)

A V O G A D R O S L A W: EXAMPL E 2 ANSWER Formula: V1 = V2 n2 First , solve for the number of moles of N2: 2 L N2 | 1 mol N2 = .089 mol N2 | 22.4 L N2 Remember, at STP:

22.4 L/mol V1 = 2.0 L n1 = ? g N 2 V2 = 22.4 L n2 = 1 mol N2 Then, use dimensional analysis to convert from moles of N2 to grams of N2: .089 mol N2 | 28.014 g N2 = |

1 mol N2\ 2.5 g N2 n1

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