Answer:

Explanation:
The given reactions are:
PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq) 
AgCl(aq)⇌Ag+(aq)+Cl−(aq) 
Required reaction is:
PbCl2(aq)+2Ag+(aq)⇌2AgCl(aq)+Pb2+(aq)

Answer:
The answer is 4.28 moles
Explanation:
This is super easy okay, you won't forget this!
Basically mole ratios, we're just looking at the coefficients in front of the compounds, multiplying them, and dividing them as we see fit.
In this example, you can see how you need 2 moles of lithium bromide (LiBr) for the reaction, and 2 moles of lithium chloride (LiCl) will be produced.
Basically, the <u>molar ratio</u> is when you divide numbers and see how much of this do I have for that (if that makes sense).
So if you were to divide the 2 moles of LiBr / 2 moles of LiCl = 1. So we know that the mole ratio for LiBr to LiCl is 1:1 or 2:2, either or, it's the same thing.
SO THE BIG IDEA, if we have 4.28 moles of lithium bromide reacting, we should also have 4.28 moles of lithium chloride produced, BECAUSE the <u>mole ratio</u> is 1:1.
I hope this makes sense please tell me if it doesn't, I will try my best to explain a little more.
No because pepperoni pizza is an object.
Hiya!
I believe the answer is...
C.
I hope this is right!

Answer: 1739.6g
Explanation:
P1 = 7.04MPa
T1 = 25°C = 25 + 273 = 298K
n1 = 150mol
P2 = 2MPa
T2 = 19°C = 19 + 273 = 292K
n2 =?
n1T1/P1 = n2T2/P2
(150x298)/7.04 = (n2x292)/2
7.04xn2x292 = 150x298x2
n2 = (150x298x2) /(7.04x292)
n2 = 43.49moles
Molar Mass of Ar = 40g/mol
Mass = n x molar Mass = 43.49x40 = 1739.6g