We are asked to calculate the original pressure of the system.
Boyle's law states the relationship between pressure and volume of gases. It states that pressure of gas is inversely proportional to volume of gases at constant temperature.
P1V1 = P2V2
parameters for the first instance on the left side and parameters for the second instance are on the right side of the equation
P - original pressure
P x 365.2 mL = 241.3 Torr x 478.2 mL
P = 316.0 Torr
Answer:
a chart
Explanation:
a chart a chart is the answer
Explanation:
When the covalent bonds in a molecule are polarized so that one portion of the molecule experiences a positive charge and the other portion of the molecule experiences a negative charge. This separation of opposite charges creates an electric dipole.
Answer:
The total heat required is 4088.6 J
Explanation:
We have three processes which involve heat absorption. We have to calculate the heat of each process and then to calculate the total heat.
1- liquid ethanol is heated from 25ºC (298 K) to the boiling point 78.5ºc (351.5 K). We use specifi heat of liquid ethanol to calculate the heat absorbed in this part:
H1= m x Sh x ΔT
H1= m x Sh x (Tfinal - Tinitial)
H1= 3.95 g x 2.45 J/g.K x (351.5 K -298 K)
H1= 517.7 J
2- State change: liquid ethanol is vaporized it turns gaseous ethanol The process occur at constant temperature (78.5ºC= 351.5 K). We need the molecular weight of ethanol (2 x 14 + 5 + 16 + 1= 46 g/mol) to cancel mol unit:
H2= m x ΔHvap x 1/Mw
H2= 3.95 g x 40.5 KJ/mol x 1 mol/46 g
H2= 3.477 KJ= 3477 J
3- Gaseous ethanol is heated from 78.5ºC to a final temperature of 95ºC (368 K). We use the specific heat of gaseous ethanol:
H3= m x Sh x ΔT
H3= 3.95 g x 1.43 J/g.K x (368 K - 351.5 K)
H3= 93.2 J
The total heat required is calculated as follows:
Htotal= H1 + H2 + H3
Htotal= 517.7 J + 3477.7 J + 93.2 J
Htotal= 4088.6 J
<u>Answer:</u>
<em>54.9 mg of the radioisotope are still active after 110 min.</em>
<u>Explanation:</u>
Half-life of F-18 is found to be 109.7 minutes
Rate constant
t = time taken = 110 minutes
[A] is the final quantity
is the initial quantity
Plugging the values and solving for [A]
[A] = 54.9 mg is the Answer