Answer:
a) Xbenzene = 0.283
b) Xtoluene = 0.717
Explanation:
At T = 20°C:
⇒ vapor pressure of benzene (P*b) = 75 torr
⇒ vapor pressure toluene (P*t) = 22 torr
Raoult's law:
∴ Pi: partial pressure of i
∴ Xi: mole fraction
∴ P*i: vapor pressure at T
a) solution: benzene (b) + toluene (t)
∴ Psln = 37 torr; at T=20°C
⇒ Psln = Pb + Pt
∴ Pb = (Xb)*(P*b)
∴ Pt = (Xt)*(P*t)
∴ Xb + Xt = 1
⇒ Psln = 37 torr = (Xb)(75 torr) + (1 - Xb)(22 torr)
⇒ 37 torr - 22 torr = (75 torr)Xb - (22 torr)Xb
⇒ 15 torr = 53 torrXb
⇒ Xb = 15 torr / 53 torr
⇒ Xb = 0.283
b) Xb + Xt = 1
⇒ Xt = 1 - Xb
⇒ Xt = 1 - 0.283
⇒ Xt = 0.717
Answer:
1) 10.0 moles of NO
2) 25 moles of NaCl
3) 1200 moles of CO2
1. How many moles of nitrogen monoxide can be made using 5.0 moles of oxygen in the following composition reaction?
N2 + O2 → 2NO
For 1 mol N2 we need 1 mol O2 to produce 2 moles of NO
For 5.0 moles of N2 we need 5.0 moles of O2 to produce 10.0 moles of NO
2. The neutralization of an acid with a base is a double replacement reaction in which a salt and water are formed. If you start with 25 moles of HCl and neutralize it with NaOH how many moles of NaCl will be formed?
HCl + NaOH → NaCl + H2O
For 1 mol HCl we need 1 mol NaOH to produce 1 mol of NaCl and 1 mol H2O
For 25 moles of HCl we need 25 moles of NaOH to produce 25 moles of NaCl and 25 moles of H2O
3. A car burns gasoline (octane – C8H18) with oxygen. If you drive to Salt Lake and burn 150 moles of octane how many moles of carbon dioxide are you producing?
2C8H18 + 25O2 → 16CO2 + 18H2O
For 2 moles of octane we need 25 moles of O2 to produce 16 moles of CO2 and 18 moles of H2O
For 150 moles of octane we need 25*75 = 1875 moles of O2
To produce 16*75 = 1200 moles of CO2 and 18*75= 1350 moles
Explanation:
Answer:
I think the answer is: one element and one compound
Explanation:
I'm really sorry if it's wrong.
Explanation:
Elements that belong to the same period which is seen horizontally in the periodic table have different properties. Elements with similar properties are seen in columns or groups. Elements in the same period have similar principal quantum number and belong to the same principal shell. Hence the answer is that they have different properties that repeat across the next period.
I don’t know what kind of response you want to be written but here are some examples if you are trying to recommend or not recommend your science class to a friend:
Positive View:
Dear (Friend),
My science course is really interesting!
You would not believe the topics we are going to learn this year! We are going to learn about the (topic), (topic), and (topic)! Not only that, did you know that (fun fact)? This science course is probably one of the best classes I ever taken! You should take one of these classes if you are also interested in it.
From your friend, (Name)
Negative View:
Dear (Friend),
My science course is not as interesting and exciting as I thought.. It doesn’t have topics about (topic), (topic), and (topic)... I recommend that you don’t take this course. It really is bad. There is not much to be learned here. But if you really want to join the course, I won’t stop you. After all, that is what you wanted. But I will give good luck to you since you might need it. Don’t say that I didn’t warn you.
From your friend, (Name)
Neutral View:
Dear (Friend),
The science course I’m taking is actually not that bad. It have topics that I don’t really understand but I guess I will just learn it along the school year. If you want to know what kind of topics, the topics they are (topic), (topic), and (topic). They seem hard but if I read from a textbook, I start to understand a bit. Though I wouldn’t recommend it to others, it actually have very interesting knowledge to know about. If you want to join, then join.
From your friend, (Name)
