Combined Gas Law

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Combined Gas Law putting it all together!
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Combined Gas Law

• P1V1 P2V2

T1
T2
for a fixed amount ( moles) of gas
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Combined Gas Law

• given 5 of 6 variables, can identify 6th
• if a variable is constant, just ignore it
• P1V1 P2V2
• T1 T2

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Avogadros Hypothesis

• equal volumes of gases at same
• T and P contain equal of particles

6.02 x 1023 particles
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Molar Volume

• reminder
• 1 mole of any gas at STP occupies 22.4 L/mol

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3 containers same size, same T, same P, 1mole
gas
Box B N2
Box A He
Box C CH4
What can you say about of molecules in each box?
molecules is the same in each box
(1 mole each substance)
What can you say about of atoms in each box?
B 2 x A C 5 x A