subject
Chemistry, 22.11.2021 23:40 khenalilovespandas

ΕΛΑ 1
a
C
Copper(II) nitrate decomposes on heating. The reaction is endothermic.
2Cu(NO),(s) → 2CuO(s) + 4NO2(g) + 0,(9)
Sketch a reaction pathway diagram for this reaction to include the
activation energy
[3]
b Draw an energy cycle to calculate the standard enthalpy change for
this reaction, using enthalpy changes of formation.
[3]
Calculate the enthalpy change for this reaction using the following
enthalpy changes of formation.
AH, [Cu(NO, ),(s)] = -302.9 kJ mol-'
AH, [CuO(s)] =-157.3 kJ mol-!
AH [NO,(g)] = +33.2 kJ mol-!
[3]
d Copper(II) sulfate is soluble in water. A student dissolved 25.0 g of
copper(II) sulfate in 100 cm of water in a polystyrene beaker stirring
all the time. The temperature of the water fell by 2.9 °C.
i Calculate the enthalpy change of solution of copper(II) sulfate.
(specific heat capacity of water = 4.18 Jg1 °C ; relative
molecular mass of copper(II) sulfate = 249.7 g mol-')
[3]
ii Suggest one source of error in this experiment and explain how
the error affects the results.
[2]
[Total: 14]

ansver
Answers: 2

Other questions on the subject: Chemistry

image
Chemistry, 22.06.2019 16:00, graciewyatt6833
Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.
Answers: 2
image
Chemistry, 22.06.2019 19:30, ijohnh14
Describe the forces both attractive and repulsive that occur as two atoms move closer together.
Answers: 1
image
Chemistry, 22.06.2019 20:30, sydneip6174
We are hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?
Answers: 2
image
Chemistry, 22.06.2019 21:30, ellllaaaxx
Do polar molecules have ionic bonds?
Answers: 3
You know the right answer?
ΕΛΑ 1
a
C
Copper(II) nitrate decomposes on heating. The reaction is endothermic....

Questions in other subjects:

Konu
Mathematics, 09.04.2021 02:00
Konu
Mathematics, 09.04.2021 02:00