1- The volume of a sample of gas is 650. mL at a pressure of 1.60 atm. Assume th
ID: 1007674 • Letter: 1
Question
1- The volume of a sample of gas is 650. mL at a pressure of 1.60 atm. Assume that the temperature is held constant.
a)What is the volume of the sample at a pressure of 2.00 atm?
B)What is the pressure of the sample when the volume is 500. mL?
2) What volume will 5.00 g of N2O gas occupy at 50C and 12.0 atm?
3) How many liters of O2 are required to prepare 5.0 L of HCN?
Half life problems: use the method At = A0e kt = A0e ( 0.693t t1/2 )
4) A sample of 35 16S, a emitter, has an activitiy of 0.100 µCi. In 20.0 days, the activity of the sample has declined to 0.0853 µCi. What is the half-life of 35 16S?
5) The half-life of 59 26Fe is 44.6 days. How long will it take for 95.0% of a sample of this nuclide to decay?
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Explanation / Answer
1.
a. P1V1 = P2V2
(1.6*0.65 = 2*v2)
v2 = FINAL VOLUME = 0.52 L
b. (1.6*0.65 = P2*0.5)
P2 = 2.08 atm
2.
from ideal gas equation
PV = nRT
(12*V) = (5/44)*0.0821*323
v= volume of gas = 0.2511 L
3.
4. k = 1/tln(a/x)
k = (1/20)ln(0.1/0.0853) = 0.00795 day-1
t1/2 = 0.693/0.00795 = 87.17 days
5. k = 0.693/44.6 = 0.0155 day-1
0.0155 = (1/t)ln(100/5)
t = 193.27 days
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