A level south west regional mock gce 2022 chemistry 2
A level south west regional mock gce 2022 chemistry 2
. (a) i) What do you understand by “A mole”
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ii) 7.50 g of a hydrated copper (II) sulphate (C11SO4.nH20) on heating gave 4.8 g of anhydrous
copper (II) sulphate. Determine the value of n (moles of water of crystallization).
(3 marks)
b) i) State Raoult’s law.
(ii) At 25 °C, the vapour pressure of pure methanol and ethanol are 8.1 x 104 Pa and 4.5 x 104 Pa
respectively. For a mixture of 12.8 g methanol and 9.2 g ethanol, calculate;
(A) The mole fraction of each component.
(B) The partial pressure of each component.
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(4 marks)
(c) i) For the molecule NCI3
(A) Draw its dot and cross diagram
1 1
1.
(B) Draw and state its shape
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(ii) Account for the regular increase in boiling point of the hydrides of Group IV (Group 14), carbon to
lead and the abnormally high boiling point of water compared to the other hydrides of group VI (Group
16), Oxygen toTellurium.
