Moles of NaOH = mass / molar mass = 7 / 40 = 0.175 moles
Energy released = mass of water * Specific heat * Temperature change = 238.5 * 4.184 * (27.66 - 20) = -7.643 KJ
Molar enthalpy = heat / number of moles = -7.643 / 0.175 = -43.67 KJ/mol
6) Enthalpy change = sum of enthalpy of formation of products - sum of enthalpy of formation of reactants
= (4 * 90 + 6 * -286) - (4 * -46 + 5 * enthalpy of formation of O2)
We can't do it without thye missing value for oxygen
7) D.
5-7 help please !! due soon S When 7.0 g of sodium hydroxide (NaOH) is dissolved...
DUE TOMORROW!!! Name Lab Instructor Date SS is Just a Four Letter Word UUUUUUU Pre Lab Assignment Experiment 3: HESS is Just a Four Le Consider the following reactions 1. CH(g) + 2 O2(g) - CO2(g) + 2 H20(1): AH=-890 kJ/mol 2. 2 CH (9) + 4 O2(g) – 2 CO2(g) + 4H2O(): AH=-1780 kJ/mo 3. CO2(g) + 2 H2O(l) - CHug) +2 02(g): AH=890 kJ/mol 4. 2 H2O(l) + 2 H2O(g): AH = 88 kJ/mol Quantitatively, how does the...
Part A When a 1.78 g sample of solid sodium hydroxide was dissolved in a calorimeter in 60.0 g of water, the temperature rose from 4.2 °C to 40.8 °C . Calculate AH (in kJ/mol NaOH) for the following solution process: NaOH(s)- Na (aq) +OH (aq) Assume that it's a perfect calorimeter and that the specific heat of the solution is the same as that of pure water. ΑΣφ ? kJ/mol
When a 3.11 g sample of solid sodium hydroxide was dissolved in a calorimeter in 130.0 g of water, the temperature rose from 18.9 oC to 31.3 o C . Calculate Δ H (in kJ/mol NaOH ) for the following solution process: NaOH(s)→Na+(aq)+OH−(aq). Assume that it’s a perfect calorimeter and that the specific heat of the solution is the same as that of pure water.
Part B Click on the process is revend AH Changes sign when a button within the activity and analyze the relationship between the two reactions that are displayed. The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, AH, changes sign when a process is reversed. Consider the reaction H2O(1)+H2O(g), AH = 44.0kJ What will AH be for the reaction if it is reversed? Express your answer with appropriate units. View Available...
When 50.08 g of 1.00 M NaOH at 23 C is added to 50.22 g of 1.00 M HCl at 23 C, the resulting temperature of the mixture is 29.7 C. (Assume that the calorimeter constant is equal to zero. Assume that the solutions have the same specific heat capacity (4.184 J/g·K) and density (1.00 g/mL) as water. Take care with signs.) a) What is ΔT for this process? b) Calculate qsolution (in J) for this process. c) Calculate qreaction...
Sodium hydroxide reacts with carbon dioxide as follows: 2 NaOH(s) + CO2(g) Na2CO3(s) + H2O(1) If 3.70 mol NaOH and 2.00 mol CO2 are allowed to react, how many moles of the excess reactant remains? 0.15 mol CO2 O 0.30 mol NaOH O 1.70 NaOH 1.00 mol CO2 How much energy is required to change the temperature of 1.50 L of water from 25.0 °C to 100.0 °C? The specific heat capacity of water is 4.184 J/g.°C; density H2O =...
QUESTION 1 The weak acid, HX, is neutralized by sodium hydroxide as shown below HX(aq)+ NaOH(aq) NaCN(aq)+ H20(1) Suppose you carried out this reaction in a coffee cup calorimeter using 50.0 mL of 0.500 M HX and 50.0 mL of 0.500 M NaOH If the temperature of the calorimeter increases by 2.02 C, what is the enthalpy of this neutralization reaction (in kJ/mol)? Assume the density of the solution is 1.00g/mL and that the specific heat is 4.184 J/g "C...
please help me with these annoying multiple choice questions. Thanks Which of the following statements about the reaction shown on the right, in figure 2, is correct? 8. a.) The activation energy of the reverse reaction is smaller than that On patential of the forward reaction b.) The reaction is endothermic c.) The second step of the reaction mechanism is the rate determining step d.) This mechanism is composed of two steps Figure 2: Potential energy diagram of a hypothetical...
i am needing help with question 4 and 5. anything else helps Name Experiment 7 Calorimetry Postlab: Questions 25 points possible Section (day&time) Instructor Due date Answer the following questions using complete sentences and support your answers with swers calculations, if desired. Attach additional pages as necessary. Handwritten or typed an are acceptable.(5 pts per question) 1. If som e of your hot metal remained in the test tube when it was transferred to the eter, would its calculated molar...
I'm struggling with this lab, need help with questions on page 3, explanations please. F11 FiB FIO R F9 FO FE FY F4 Name N E The Enthalpy of Neutralization of Phosphoric Acid As you have seen in previous experiments, a great deal can be learned by conducting an acid- base reaction as a titration. In addition, acid-base reactions can be observed and measured thermodynamically. In this case, the reaction is carried out in a calorimeter. If the temperature of...