How to solve this question?
My teacher explained this in class but I didn’t understand it at all can anyone help?
36 Replies
@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.ayo what this seems to be of States of Matter and some Equilibrium or smthing
equi, pv nrt and solutions
ye teen ka mix
haan this is direct
share attempt na
This is how my teacher did it but I dint understand it
Could you explain the logic behind it?
so do u know the basic formula on vapour desnity an all?
noooooooooooooooooooooo
these formulae
yuck
what sephrina said, do you know this?
i am wondering wht they are maine kabhi nhi dekha hai ye
what are those formulas
dont see not worth your time
basic se line sketch karo and derive ur thing thts the rule
do you follow the t = 0 t = 30 thing?
Yea
Are they not efficient?
they are a cognitive load that are unnecessary
pchem needs to happen from first principles :)
mug vomit helps in some exams that have minutes = number of qs, agreed
whioch part is new?
the formula is just taking a weighted avg
total mass/total moles = molar mass
and vd x 2 = molar mass
that is all there is to this q :)
(after you do the t = 30 part)
But in that won’t you get an equation in two variables
kyu ?
aap ik var isko formula ko jaane do jo teacher ne diya aap ik vaar apni understanding se try karo
aur agr kuch doubt phir bhi aara to batao
Theek hai I’ll try it
what are the two variables?
i only see x
molar mass is vd x2
def hai, look it up online :D
Haan vo to pata hai
When I try to start solving these questions my brain stops working
I never know the first step only
write out given na first
and then see konse formula lag sakta hai
There’s molar mass of d and x right?
Vo karta hu
Phir aur frustrate ho jata hu
aree pehle to aap solve karne se phle calm down karo apna mind aur baki chze hata do
basic se sochne ka try karo aur apni learnt theory dalna try karo
ki uk tht the formula is this ab mereko given ye hai
ab mai aisa kya karu ki is chiz se mujhe vo mil jaaye
and then keep that chain going till u reach the ans
I’ll try that thanks🙂
Yes but how will you find it for D?
yyou have a
so you know how much A exists at t = 30 as well
you know total moles of C and D
molar mass of C is given :)
works?
@YAWN what are the answers? are they 120 and 160 and 0.4, 0,2, 0.2?
if so here's an easy method
first you need to know that VD = M/2 (m= molecular weight). And VD of mixture is Mavg/2. What your teacher has used is the formula for Mavg. They assumed 3x moles of A have been converted and that x and x moles have been formed. The second eqn you can get from the law of conservation of mass. The numerator of this Mavg expression can be replaced by 120 and you can find the value of x.
I can send the written soln if you can't understand it
By using law of conservation of mass it becomes really straightforward
Hey dude I didn’t get this part if you could explain it again please?
That's the total number of moles. Summation of 1-3x, x and X
yes, the total moles. the first eqn I used is the Mavg one, the one you have also sent. The second one is law of conservation of mass. ( the one you marked in white). 120 g of reactant was there initially. So finally at t=30 mins if we multiply the moles of each constituent with its molar mass we'll get the total mass at that instant. And I have equated that to 120. Then I just subbed 120 in the num of the Mavg expression, cuz they're the same.
120 = (moles of A at t=30)Ma + (moles of C at t=30)Mc + (moles of D at t=30)Md (where Ma, Mc and Md are molar masses)
+solved @Sephrina @iTeachChem @ns
Post locked and archived successfully!
Archived by
<@733935450288554055> (733935450288554055)
Time
<t:1751618932:R>
Solved by
<@888280831863451688> (888280831863451688), <@1035556259417571408> (1035556259417571408), <@1239101937866248205> (1239101937866248205)