Answer: Here are the answers
Explanation:
7a) Calcium Chloride +water+carbon dioxide
b)Calcium Oxide +Carbon dioxide
8a) zinc + carbon monoxide
b) Aluminum + Carbon dioxide
c) Lead + carbon dioxide
Answer:
a) boiling pressure:
P = 0.759 atm
b) mole fractions in the vapor phase:
Xethanol(v) = 0.2192
Xwater(v) = 0.7808
Explanation:
Raoult's law:
- Pa = (P*a)×(Xa,(l))
- Xa(l) + Xb(l) = 1
∴ a: water
∴ b: ethanol
∴ Xb(l) = 0.1238
⇒ Xa(l) = 1 - 0.1238 = 0.8762
vapor pressure of the pure components at T = 85.3°C:
∴ P*a(85.3°C) ≅ 400 torr (0.53 atm).....from literature
∴ P*b(85.3°C) ≅ 800 torr (1.053 atm).....from literature
total pressure of the mix:
⇒ Pt = ((0.53 atm)(0.8762)) + ((1.053 atm)(0.1238))
⇒ Pt = 0.5947 atm
boiling point:
- Xb(l) = Xa(l) = 0.5
- P = (P*b - Pt)(0.5) + P*a
⇒ P = ((1.053 atm - 0.5947 atm)(0.5)) + 0.53 atm
⇒ P = 0.759 atm
assuming that the gas system is ideal:
- (Xb(v))(Pt) = (P*b)(Xb(l))
fraction in the vapor fase, ethanol:
⇒ Xb(v) = (P*b)(Xb(l)) / Pt
⇒ Xb(v) = ((1.053 atm)(0.1238)) / (0.5947 atm)
⇒ Xb(v) = 0.2192
∴ Xa(v) = 1 - Xb(v)
⇒ Xa(v) = 1 - 0.2192 = 0.7808
Answer:
C
Explanation:
In thermodynamics, a exothermic system looses heat to the surroundings while an endothermic system absorbs heat from the surroundings.
A system is a part the universe marked off by a specified boundary. The contents of the cup constitutes the system in this case.
The region of space outside the system is called the surroundings. Hence everything outside the cup constitutes the surroundings.
Answer: Osmotic pressure : increases
Explanation:
Osmotic pressure is the minimum pressure which is applied to a solution to prevent the flow of solvent across a semipermeable membrane
= osmotic pressure
C= concentration in Molarity (number of moles of solute dissolved per liter of the solution)
R= solution constant
T= temperature
Thus as osmotic pressure is directly proportional top concentration, osmotic pressure will increase on increasing the concentration of a nonvolatile solute in water.
Answer:
B
Explanation:
carbon 12 is most useful to humans
