In the following reaction : NaO2(s)+H2O(l)⟶NaOH(s)+O2(g)NaO2(s)+H2O(l)⟶NaOH(s)+O2(g)   (YES, this reaction is written correctly). In an experiment at  23.0∘∘C and 755 torr in which water vapor reacts with a quantity of NaO2 , it was found that 3.22 kJ of heat was absorbed. The oxygen gas produced was then collected at 21.0∘∘C and 795 mmHg. What volume (in liters) of oxygen was collected?     Standard ΔH0fΔHf0 NaO2(s) - 260,2 kJ H2O (l) - 285.8 kJ NaOH (s) -425.93 kJ O2 (g) 0

A researcher studying the nutritional value of a new candy places a 4.90 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.61 °C. If the heat capacity of the calorimeter is 48.50 kJ-K-, how many nutritional Calories are there per gram of the candy?

(71) Consider the following reaction. From the given choices of intermediates and/or final products, choose the 5 related to this reaction and put them in order to describe the complete mechanism (all the steps involved) for this reaction.

A simple method for the laboratory preparation of hydrogen involves reaction of zinc with hydrochloric acid;Zn(s) + 2 HCl(aq) → ZnCl 2(aq) + H 2(g) ΔH = -152.5 kJ How much heat in kilojoules is evolved if a total of 1094 mL of H 2 was collected over water at 28.00 ° C and an atmospheric pressure of 275.7 mm Hg. The partial pressure of water at this temperature is 28.35 mm Hg? Assume heat evolved is directly proportional to the moles produced.

12.00 g of Compound with molecular formula C4h8 are burned in a constant-pressure calorimeter containing 15.00 kg of water at 25 °C. The temperature of the water is observed to rise by 8.603 °C. (You may assume all the heat released by the reaction is absorbed by the water, and none by the Calculate the standard heat of formation of Compound X at 25 °C. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits. calorimeter itself.)

Write equations for the reactions of the following Bronsted bases with water: (a) NH3 (b) TeO3 2- (c) CH3CH2CO2

The enthalpy of reaction for the formation of 2.00-mol ozone from 3.00-mol O2 (g): 3 O2 (g) à 2 O3 (g)  is ∆Horxn = 429 kJ at 1 atm and 25 oC. In this question, O2 (g) and O3(g) are rigid molecules and have the ideal gas behavior. Their molar heat capacities at constant pressure are independent of temperature, and follow the values shown in our lecture note (Page 56 in Chapter 2 Part 1). At -35 oC, the enthalpy of reaction for the above reaction ( 3 O2 (g) à 2 O3 (g) ) should be _______ 429 kJ.     Insufficient information     equal to         greater than       less than

A sample of steam with a mass of 0.506 g at a temperature of 100 ∘C condenses into an insulated container holding 4.20 g of water at 3.0 ∘C . For water, ΔH∘vap=40.7kJ/mol and Cwater=4.18J/(g⋅∘C) .

Cl2 (g) + H2 (g) → 2 HCl (g) ΔH0rxn = ‒184.6 kJ 8. What is ΔH0rxn when 4.50 mol HCl (g) forms? (Slides 17 – 18: Stoichiometry of Thermochem. Eq.) Group of answer choices A.‒831 kJ B.‒415 kJ C.‒207 kJ D.831 kJ E.415 kJ

A 3.19 g sample of aniline was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C.  If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔHcombustion in kJ/mol for aniline.   (C6H5NH2, molar mass = 93.13 g/mol)