Chapter fourteen station problem twenty. We are given the gas, eh? And this gas is going to be converted to just be and this is going to be over a period of time. So let's start How? Point warm all ofthe gas, eh? And since for everyone mawf a reject warm off B, what we convert here is going to be what we have here. So at the times, you ve vill haff zero amount ofthe gas because nothing is converted yet, but it at the second step point zero six seven moles off gas a left. It means the Komar to them one is point zero thirty three. This is equal to this difference at the turnstile. You'LL have point zero four two five and then points your authority and lastly point zero twenty. Now, at the second step, the difference from the initial amount to the final amount is all going to be converted to be. This is going to be a point zero fifty fund similarly similarly from the first two turn in the last are going to be pulling zero seventy and point zero eighty. And that's what you're asking part, eh? It asks. Calculate the number of moles off be each time in the table. Part B asks calculate the average rate ofthe disappearance off A for every forty second in terrible units now zero. And then it increases with every forty second interval hundred twenty, one hundred sixty. So they're asking us the average, um, rate of disappearance and they once the units to be moles over seconds. Now all these numbers are moles, and the time is in seconds. So clearly we're going to divide malls two seconds to get the unit off More seconds. What we have is that this appearance or here off, eh is going to be equal to what we get out of from from B so point zero thirty three Do I buy forty moles per seconds are going to give us point zero zero zero eight two five. This's for this interval. This interval is going to be this time. They're only going to get the difference between these two rather than the entire thing. If ever making the call clich? In from the initial to the last, then we would have to divide by eighty. But this sign we're only going to deal with poise. You're twenty two divided by forty again. And that will give us point zero zero zero fifty five. This interval is going to be points. You're fifteen. Do I buy forty? It shall be called to point zero zero zero three seven five. And the last thing terrible is going to be a point zero ten. The difference between these two do I buy point forty is going to be point zero zero zero. You can fight. And all the units for these are moles per seconds. Unless they were asked Rich off, the fallings will be needed to calculate to raid in units off concentration per time. So concentration means polarity and is the pants on moles over the volume. So what we need is the volume so we can find the concentration hand. Great. Off this appearance would be Morty, divided by time. So what we need is simply the volume over here to be able to get the concentration and rate ofthe disappearance