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Chemistry: Post your doubts here!

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2X(NO3)2 --> 2XO + 4NO2 + O2

let x be the Mr of element X

moles of X(NO3)2 = 3/(x+124)

mass of XO = 3 - 1.53 = 1.47 g
moles of XO = 1.47/ (x + 16)

Based on the balanced equation, moles of X(NO3)2 =moles of XO
Therefore, 3/(x+124) = 1.47/ (x + 16)

Solve for x.
oh thank you so much ... i had balanced my equation wrong.
 
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How do you draw the apparatus to collect water and then N2O?
1c:
papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_52.pdf

Collect the water through condensation.

Screen Shot 2015-11-01 at 1.51.33 PM.png

As for the nitrogen oxide, a gas syringe should suffice.
 
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2X(NO3)2 --> 2XO + 4NO2 + O2

let x be the Mr of element X

moles of X(NO3)2 = 3/(x+124)

mass of XO = 3 - 1.53 = 1.47 g
moles of XO = 1.47/ (x + 16)

Based on the balanced equation, moles of X(NO3)2 =moles of XO
Therefore, 3/(x+124) = 1.47/ (x + 16)

Solve for x.
Is the mass of total products always equal to the mass of reactants used?
 
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Water is added to anhydrous aluminium chloride to make a 0.1 mol dm-3 solution.
Which observations are correct?
1 The reaction is endothermic.
Why this statement is incorrect?
 
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Water is added to anhydrous aluminium chloride to make a 0.1 mol dm-3 solution.
Which observations are correct?
1 The reaction is endothermic.
Why this statement is incorrect?
Enthalpy change of hydration is always exothermic, not sure, but till now I have not come up with a question of it with Endothermic. If u know some reaction that is endothermic do lemme know!! Thanks.
 
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Enthalpy change of hydration is always exothermic, not sure, but till now I have not come up with a question of it with Endothermic. If u know some reaction that is endothermic do lemme know!! Thanks.
Why this is enthalpy change of hydration instead of enthalpy change of solution? Thank you !
 
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Why this is enthalpy change of hydration instead of enthalpy change of solution? Thank you !
enthalpy of change hydration is the enthalpy change when "gaseous atoms" dissolve in water while enthalpy of solution is when "ionic compound' dissolves in water.. u can check whats going in your question and relate.
 
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help plzdkvcmkde.PNG
this is a paper 5 question, that means no application booklet, so how am i supposed to write the equation without it
 
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hey!!
can someone please explain this:
When a sample of HI is warmed to a particular temperature the equilibrium below is established.
2HI(g) H2(g) + I2(g)
At this temperature, it is found that the partial pressure of HI(g) is 28 times the partial pressure of H2(g). What is the value of Kp at this temperature?
A 1.28 × 10–3
B 0.035
C 28
D 784
The answer is A.
Thank you!!
 
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hey!!
can someone please explain this:
When a sample of HI is warmed to a particular temperature the equilibrium below is established.
2HI(g) H2(g) + I2(g)
At this temperature, it is found that the partial pressure of HI(g) is 28 times the partial pressure of H2(g). What is the value of Kp at this temperature?
A 1.28 × 10–3
B 0.035
C 28
D 784
The answer is A.
Thank you!!
P^2(HI) = (28)^2
P(H2) = 1
P(I2) = 1
Kp = P(H2).P(I2) / P^2(HI)
Kp = A
 
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