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poshmom poshmom
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13 years ago
#9) 9 mols of CO2 are stored in a 30.0L container at 65C.  What is the pressure of the CO2 in the container?

(Do you use the PV=nRT)?  I had an example and it was confusing.  HELP


#14) Express the concentration of a solution of a solution prepaired by adding 3.4 grams of NaCl to 100 ml of water in Molarity and %(m/v).
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13 years ago
#9)

You're absolutely right! 

V = 30.0 L
n = 9 moles
R = 0.0821 atm*L/mol*K
T = 65°C Rightwards Arrow 338.15 K
P = ?

PV = nRT

P(30.0 L) = (9 moles)(0.0821 atm*L/mol*K)(338.15 K)

P = [(9 moles)(0.0821 atm*L/mol*K)(338.15 K)]/30.0 L

P = 8.33 atm

#14)

Molarity = moles/L

First, find the moles of NaCl:

3.4 g of NaCl x 1 mole of NaCl/58.44 g of NaCl = 0.0582 moles

Since molarity is moles/L and not moles/mL, we must convert 100 mL of water to L:

1 L = 1,000 mL

100 mL x 1 L/1,000 mL = 0.1 L

Molarity = moles/L = 0.0582 moles/0.1 L = 0.582 moles/L

%(m/v) = 3.4 g/100 mL x 100% = 3.4 % (m/v)


Hope this helps!  Smiling Face with Open Mouth
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