chemistry need some help fast!!!

[isa2hard]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_qp_23.pdf
for question 2b ii)
i thought it was n=cv? why does it use a different formula on mark scheme

 

[panpan101]

2b? It isnt a calculation question

 

[panpan101]

Use mol ratio to find it. 2 Li : 1 H2, So, the mol of Li divided by 2 when u cross multiply. Then get the volume buy using the formula v = n x 24dm3

 

[x-gamer-x]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_23.pdf
for question 2b ii)
i thought it was n=cv? why does it use a different formula on mark scheme

nah
we cant use this

from equation and from the answer of i we can calculate no. of moles of H2 produced
we will mutiply with 24
and got the vol in dm3

 

[ikyorince]

Is there anyone appearing As chemistry 9701/22 this oct-nov 2013?? The exam in my country got postponed for some reason and I guess they'll take it after two days. So, if any of you have given this paper or any variant 21 or 23, can u post here the questions u remember? a slight help would be remembered forever. I AM A VERY WEAK STUDENT, plz someone help me