Which one statement is TRUE in regards to a 1.0 M MgCl_2(aq) solution? a. In 1.0
ID: 1060172 • Letter: W
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Which one statement is TRUE in regards to a 1.0 M MgCl_2(aq) solution? a. In 1.0 M MgCl_2(aq) would be a worse electrical conductor than 1.0 M C_12H_22O_11 b. In 1.0 M MgCl_2(aq) is an Arrhenius acid. c. In 1.0 M MgCl_2(aq), water is the solvent. d. To make 1.0 M MgCl_2(aq) dissolve 95.21 mol of MgCl_2 in 1 L of total solution Starting with an 8.073 M HNO_2 stock solution (this is labeled as solution 1), you prepare three standard solutions (labeled 2, 3, and 4) via serial dilution. At each stage, you dilute 10,00 mL of solution to 50.00 mL. What is the concentration of the final solution (i.e. solution 4)? a. 1.615 M b. 1.009 M c. 0.06458 M d. 0.01292 M Of the following gases, has a density of 2.104 g/L at 303 K and 1.31 atm. a. Xe b. He c. Ne d. Kr e. Ar Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation. 2 NaN_2(s) rightarrow 2 Na(s) + 3 Na(s) + 3 N_2(g) What mass (in g) of NaN_3 is required to provide 40.0 L of N_2 at 25 degree C and 763 torr? a. 160 b. 107 c. 71.1 d. 10.3 e. 1.64 A balloon originally had a volume of 4.39 L at 44 degree C and a pressure of 729 torr. The balloon must be cooled to to reduce its volume to 3.78 L (at constant pressure.) a. 0 degree C b. 273 degree C c. 38 degree C d. 368 degree C c. 51 degree C Which one statement is false? a. A can of coke is labeled "140 Calories". This corresponds to 5.9 times 10^-1 kJ. b. If a match is the "system", an exothermic process is occurring in a burning match. c. A reaction is exothermic if the enthalpy of the reactants is higher than the enthalpy of the products. d. I_2(g) rightarrow I_2(l) is an exothermic reaction. Which one statement is false? a. The Standard Heal of Formation of O_2(g) is zero at 25 degree C and 1 atm. b. The heat capacity is the amount of energy required to raise 1 gram of something 1 degree C. c. The change in total internal energy for a system that releases 2.60 times 10^4 kJ of heal and does 6.07 times 10^4 kJ of work on the surroundings is -8.67 times 10^4 kJ. d. Energy is an example of a state function.Explanation / Answer
5) A balloon originally had a volume of 4.39 L at 44 °C and a pressure of 729 torr. The balloon must be cooled to __________°C to reduce its volume to 3.78 L (at constant pressure).
A) 38
B) 0-----answer
C) 273
D) 546
E) 72.9
44+273 =317 k
P1 V1 /T1 = P2V2/T2
T2 = V2 T1/ V1
=3.78 x 317 /4.39=272.95k=0c
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4 .Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN3 (s) 2Na (s) + 3N2 (g). What mass (g) of NaN3 is required to provide 40.0 L of N2 at 25.0 °C and 763 torr?
E) 71.1---answer
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