At 22.5 ºC and 1.25 atm pressure, a sample of carbon dioxide gas occupies a volume of 2.65 L. How many moles of the gas are present?

1 Answer
Nov 13, 2017

Answer:

#1.36 xx 10^(-1)# #"mol CO"_2#

Explanation:

#PV=nRT#

We want to find the no. of moles, which is #n#, so

#n= (PV)/(RT)#

Here

  • #"P = 1.25 atm"#
  • #V = "2.65 L"#
  • #R= "0.0821 atm(L)/mol(K)"#
  • #T = 22.5^@"C" +273.15 = "295.7 K"#

Now plug it into the formula

#n = (("1.25 atm")("2.65 L"))/(("0.0821 atm(L)/mol(K)")("295.7 K"))#

#n = 3.3125/24.273# #"mol"#

#n = 1.36 xx 10^(-1)# #"mol CO"_2#