Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Deadly_king:
--- Quote from: moon on October 17, 2010, 04:09:43 pm ---I understood it now thanks Deadly_king and thanks 4 u too $!$RatJumper$!$
--- End quote ---
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:
--- Quote from: Ghost Of Highbury~ on October 18, 2010, 11:32:50 am ---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?
--- End quote ---
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:
--- Quote from: SpongeBob on October 18, 2010, 11:48:06 am ---
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
--- End quote ---
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??
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