ALL CIE CHEMISTRY DOUBTS HERE !!

[Deadly_king]

I understood it now thanks Deadly_king and thanks 4 u too $!$RatJumper$!$

Anytime dude

[$!$RatJumper$!$]

Guys how do you do P31 w08 Q(1)(c)

I dont understand how to do the the second step.

[Ghost Of Highbury]

1) How many lone pairs and bond pairs of electrons surround XE in XeF4?

2) A typical fertilizer contains the elements N,P and K in the ratio 15g : 30g : 15g per 100g of fertilizer.

The recommended usage of fertilizer is 14g of fertilizer per 5dm^3 of water.

What is the concentration of nitrogen atoms in this solution?

[SpongeBob]

1) How many lone pairs and bond pairs of electrons surround XE in XeF4?

2) A typical fertilizer contains the elements N,P and K in the ratio 15g : 30g : 15g per 100g of fertilizer.

The recommended usage of fertilizer is 14g of fertilizer per 5dm^3 of water.

What is the concentration of nitrogen atoms in this solution?

4 co-ordinate bonds.
So,
4 bond pairs. 2 lone pairs.

15 g in 100
x g in 14
cross multiply
x= 2.1 g

moles= 2.1/14
conc= mol/ dm3
conc= (2.1/14)/ 5
      =0.03 mol/dm3

[Ghost Of Highbury]

4 co-ordinate bonds.
So,
4 bond pairs. 2 lone pairs.

15 g in 100
x g in 14
cross multiply
x= 2.1 g

moles= 2.1/14
conc= mol/ dm3
conc= (2.1/14)/ 5
      =0.03 mol/dm3

thanks a lot

i have a doubt though

the 2nd q says the elements N,P and K are in the "RATIO" 15:30:15 in 100g of the fertilizer

this means that N in 100g of fertilizers is 15/60 * 100 = 25g , rite??

[Arthur Bon Zavi]

thanks a lot

i have a doubt though

the 2nd q says the elements N,P and K are in the "RATIO" 15:30:15 in 100g of the fertilizer

this means that N in 100g of fertilizers is 15/60 * 100 = 25g , rite??

Right!! Go ahead, any more doubts?

[nid404]

thanks a lot

i have a doubt though

the 2nd q says the elements N,P and K are in the "RATIO" 15:30:15 in 100g of the fertilizer

this means that N in 100g of fertilizers is 15/60 * 100 = 25g , rite??

It says ratio of 15g: 30g : 15g They've mentioned the units
 it means 15g of N, 30g of P and 15g of K in 100 g of the fertilizer. The fertilizer is not only made up of N,P and K...there are other compounds/elements/mixtures which make up the rest of the 40g.

[Arthur Bon Zavi]

It says ratio of 15g: 30g : 15g They've mentioned the units
 it means 15g of N, 30g of P and 15g of K in 100 g of the fertilizer. The fertilizer is not only made up of N,P and K...there are other compounds/elements/mixtures which make up the rest of the 40g.

Dumb Girl, refer the question carefully.

Tell me overall what is it and what's wrong?

[nid404]

Dumb Girl, refer the question carefully.

Tell me overall what is it and what's wrong?

I'm not a girl you moron. 

Heh? Nothing is wrong. The person answered it correctly. I'm just clarifying Ghost Of Highbury's doubt. 

[Arthur Bon Zavi]

I'm not a girl you moron. 

Heh? Nothing is wrong. The person answered it correctly. I'm just clarifying Ghost Of Highbury's doubt. 

Can I call u bhaibandh, then.

Yes, thank you for your explanation. That answer was apparently right.

[Ghost Of Highbury]

It says ratio of 15g: 30g : 15g They've mentioned the units
 it means 15g of N, 30g of P and 15g of K in 100 g of the fertilizer. The fertilizer is not only made up of N,P and K...there are other compounds/elements/mixtures which make up the rest of the 40g.

Ahh the unit, darn. Thanks both of u...

[$!$RatJumper$!$]

Guys in as chem paper 31 S09, i dont get how to do q1(c)(part 5).

I realise its something to do with ratios, but i dont get what volumes to use. Please any help would be appreciated asap as my chem prac exam is tomorrow thankx

[SpongeBob]

Can you post the paper?

[$!$RatJumper$!$]

haha dont worry about it now. i already wrote the exam

[SpongeBob]

Hope it went well then!