Gas is collected in a 5.00 liter container at 25 degree C and How many moles of
ID: 525311 • Letter: G
Question
Gas is collected in a 5.00 liter container at 25 degree C and How many moles of oxygen are present in the container? (A) 0.26 (B) 9.79 (C) 1.22 (D) 0.102 What is the concentration of ion in a solution with a pH of 7.35? (A) 4.5 times 10^(B) 2.0 times 10^-7 (C) 3.5 times 10^-7 (D) 6.4 times 10^-4 As the concentration of ion decreases, (A) the pOH increases. (B) the hydroxide ion decreases. (C) the pH increase. (D) the solution becomes more. What is the correct statement about a container in which this chemical equilibrium is established? 2SO_2(g) + O_2 (g) rightwardsharpoonoverleftwardsharpoon 2SO_3 (g) + heat (A) A decrease in the amount of SO_3 will increase the amount of SO_2. (B) An increase in the amount of O_2 will increase the amount of SO_2. (C) A decrease in the temperature will increase the amount of SO_2- (D) A decrease in the volume will decrease the amount of SO_2. temperature of a gas in a rigid, 10-litre container is constant, what happens to the pressure if the moles in the container are doubled? Pressure doubles. Pressure increases by half. increase by some unknown factor. Decrease by some unknown factor. What is the percent by mass of hydrogens in the compound C_2 H_ ? (A) 6.67% (B) 29.1% (C) 75.0% (D) What mass(in milligrams) of Na_2 SO_4 in equivalent to Na_2 SO_4? (A) 5.62 times 10^8 mg (B) 5.62 times 10^mg (C) 5.62 times 10^mg (D) 5.62 times 10^-7 mg According in Valence Shell Electron Pair Theory, which molecular geometry is correct for PCl_2? (A) (B) bent (C) (D) pyramidal Which aqueous solution has the highest boiling point? (A) 0.2 M C_6 H_12 O_6 (B) 0.2 M BaCl (C) M Ga_2(SO_4)_3 (D) 0.1 M CaCl_2 Which substance would have hydrogen bonding as one of its intermolecular forces of attraction? The K_ for a weak acid HA is 1.0 times 10^-6. What is the hydronium ion concentration in a 0.010 M HA solution? (A) 1.0 times 10^-6 M (B) 1.0 times 10^-3 M (C) 1.0 times 10^-4 M (D) 0.01 M A. 50.0 g sample of an unknown substance absorbed 1.64 kJ of energy as it changed from a temperature of 36 degree C to 98 degree C. What is the specific heat of the unknown substance in J/(g middot degree C)? (A) 0.53 (B) 0.76 (C) 1.3 (D) 1.9Explanation / Answer
(47) 4 Fe (s) + 3 O2 (g) ----------> 2 Fe2O3 (s)
During this reaction the oxidation state of oxygen is changed from 0 to - 2. Hence it is reduced.
(A)
(48) Volume, V = 5.00 L
Pressure, P = 380 torr = 380 / 760 atm = 0.5 atm
Temperature, T = 25 + 273 = 298 K
R = 0.0821 L.atm.K-1.mol-1
Ideal gas equation,
P V = n R T
n = 0.5 * 5.00 / (0.0821 * 298)
n = 0.102 mol of Oxygen gas is collected.
(D)
(49)
pH = 7.35
- Log[H3O+] = 7.35
[H3O+] = 10-7.35
[H3O+] = 4.5 * 10-8 M
(A)
(50)
(C) the pH increases. Because they both are inversely related. pH = - Log[H3O+]
(51)
Since the forward reaction is exothermic, the backward reaction is endothermic. On increasing temperature, endothermic reaction is favored, so the equilibrium is shifted towards left side which increases the amount of SO2 and O2.
(C)
(54)
Molar mass of H = 1 g/mol
Molar mass of C2H6 = 30 g/mol
% by mass = (1*6/30) * 100 = 20 %
(B)
(55) 0.562 kg = 0.562 kg * 1000 g./1kg * 1000 mg/1g = 5.62 * 105 mg
(56) (D) PCl3 is in pyramidal shape. Because of cental P has three bond pairs and one lone pair.
(57) (C) 0.1 M Ga2(SO4)3 because each one formula unit can dissociate in to 5 particles. Accroding elevation boiling point, more is the number of particles more is the elevation in boiling point.
(58) (A) Because H is attached to N
(59) (C) [H3O+] = sqrt.(Ka*C) = sqrt.(1.0*10-6*0.010) = 1.0 * 10-4 M
(60)
q = m * s * (t2-t1)
1640 = 50.0 * s * (98 - 36)
s = specific heat of the substance = 0.53 J/0C.g
(A)
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