How to determine moles of oxygen in a confined space?

Can someone please help with this question:





A tank of oxygen gas contains 175 L of oxygen at 27 degrees C and 4.83 atm pressure. How many moles of oxygen are in the tank?





Thank you in advance!How to determine moles of oxygen in a confined space?
PV=nRT


n=PV/RT


n= number of moles


P=4.83 atm


V=175 L


R=0.082L.atm.mol.mol-1.K-1


K=27+273 K





n=34.3 molHow to determine moles of oxygen in a confined space?
P V = n R T


4.83 atm * 175L = n * 0.082L atm/mloe K * (27 + 273)K


n = (4.83 * 175 ) / ( 0.082 * 300)


n = 34.36 moles
formula: PV=nRT


want: n





step 1: id values, plug into eqn and solve


step 2: check ans





n=PV/RT=(4.83 atm x 175 L)/(.0821 L*atm/mol*K x 300 K)=34.3 mol





Note: when dealing with ideal gas, must convert C to K(temperature).
About 90% of your early Chemistry will be in ratios. The 4.83 is your multiplier! But you are at 27 instead of ST. ST is 0! So the volume must be reduced as if at ST! This brings in the kelvin Temp. You must add absolute zero to the equation. There are other ways,, that is the standard way. 273 Kelvin is 0 C. At least it use to be 40 years ago. You would take the ratio of standard Kevin with the real Kelvin. that is your other multiplier, or divisor.. depending how you go. Math and Chemistry take logic reasoning.. that is up to you... if we have a higher pressure.. do we not have more moles per volume than at standard? So to adjust by volume.. we see it is more.. right? So the factor would give a higher figure.. 4.83 atm would give that many moles more! 27 is added to the 273. Then we see that the number of molecules in the oxygen or any gas would be less as it is above 0 C! so how are you to get the moles? The atmosphere figure would give more.. by that ratio given... the temperature says it is high, and that would give less. 273/(273+27) --- now you should have it. Do both the math,, it does not matter what order.. and you get the answer..study to know-- do not accept opinion of teachers unless proven.. and you see no objections! We never had to say this.. but we have to now! We should have years ago! Earl