NYU Chemistry Worksheet

Question 46 (1 point)Which of the following processes is exothermic?
sublimation of dry ice (CO2(s))
ionization of a lithium atom
breaking of a Cl-Cl bond
formation of ionic compound from its ions
Question 47 (1 point)
At 220°C the equilibrium constant for the following reaction is K = 0.33. Under
these conditions, if flask initially contains 0.42 bar of PCI5, 0.78 bar of Cl2, and no
PC13, determine the final partial pressure of chlorine at equilibrium.
PC13(g) + Cl2(g) = PC15(g)
Question 48 (1 point)
Balance the following chemical reaction using whole numbers:
– Ag(s) + _H2S(g) + – O2(g) → _ Ag2S(s) + _H20(1)
For the formulas, you can use plain text (e.g., Na2CO3).
Question 49 (1 point)
How many atoms of oxygen are found in 0.0894 g of the nickel (II) sulphate
hexahydrate (NiSO4.6H20)?
2.05 x 1020 atoms
2.05 x 1021 atoms
2.20 x 1021 atoms
1.92 x 1021 atoms
Question 50 (1 point)
How many of the following molecules have sp2 hybridization on the central atom?
Question 51 (1 point)
For the reaction of carbon sulfide with oxygen shown below, what happens to the
reaction when the equilibrium is disturbed?
CS2(7)+ 302(g) = CO2(g) + 25O2(g)
A Hº = -1104 kJ/mol
a) The volume of the container is increased
(shifts left/shifts right/no change)
b) The pressure of oxygen is increased
(shifts left/shifts right/no change)
c) Some carbon dioxide is removed
(shifts left/shifts right/no change)
d) The temperature is increased (shifts left/shifts right/no change)
e) The amount of carbon sulfide is increased
(shifts left/shifts right/no change)

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