Chemistry Cumulative Exam Questions and Correct Answers

A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution? A. Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L. B. Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L. C. Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L. D. Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L. Answer: B What does the symbol (-Hfus) indicate in a phase change? A. A gas is being formed. B. A gas is being liquefied. C. A solid is being formed. D. A liquid is being vaporized. Answer: C Consider the following reversible reaction.What is the equilibrium constant expression for the given system? A. [CO2]/[C][O2] B. [CO2]/[O2] C. [C][O2]/[CO2] D. [O2]/CO2] Answer: B The molar mass of NaOH is 40.00 g/mol. If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution?Use molarity=moles of solute/liters of solution A. 0.0125 M B. 0.260 M C. 3.85 M D. 7.69 M Answer: B A solar panel combines multi