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Volume of molecule oxygen

  • Thread starter cstout
  • Start date
  • #1
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1. Homework Statement
A mass of 0.736 kg of molecular oxygen is contained in a cylinder at a pressure of 1.0 × 105 Pa and a temperature of 1°C. What volume does the gas occupy?


2. Homework Equations

PV=nRT

V=nRT/P

3. The Attempt at a Solution


n=(.736)(1000)/16 = 46


V = (46)(8.31)(274.15)/(1x10^5)

where n = 46
R = 8.31 J/K/mol
T = 274.15k
P = 1x10^5

but that is not the correct answer, what am i doing wrong??
 

Answers and Replies

  • #2
Dick
Science Advisor
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Molecular oxygen is 0_2, two atoms of oxygen per molecule. That makes the molar mass 32g.
 
  • #3
37
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so would i multiply the mass of .736(1000)32 to find the n, or basically i still am unsure of finding the n
 
  • #4
Dick
Science Advisor
Homework Helper
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618
Multiply? You divided before and that was correct. One mole of O2 has mass 32g. So how many moles is .736kg?
 
  • #5
37
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ahh..thanks, i got it now
 

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