Calculate the theoretical enthalpy of reaction where NH4NO3 (s)  →  NH41+ (aq) +  NO31- (aq).   ΔHrxn: Please show work. ---------------------------- ΔHf (kJ/mol): For NO31- it is  -205.0 kJ/mol For NH41+  it is -132.5 kJ/mol For NH4NO3  it is -365.56 kJ/mol

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A chemist measures the energy change AH during the following reaction: 2 HgO(s) → 2 Hg(1)+O,(g) AH=182. kJ Use the information to answer the following questions. endothermic. This reaction is... x10 exothermic. Yes, absorbed. Suppose 56.6g of HgO react. Yes, released. Will any heat be released or absorbed? No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. kJ Round your answer to 3 significant digits.

Consider the reaction   2H2+O2⟶2H2O        Δ?rxn=−484 kJ   Which answer best describes the transfer of heat that occurs when 1.70 mol H21.70 mol H2 reacts? A.) 823 kJ absorbed B.) 484 kJ released C.) 484 kJ absorbed D.) 823 kJ released E.) 411 kJ absorbed F.) 411 kJ released

13. Energy is stored in the body in adenosine triphosphate, ATP, which is formed by reaction between adenosine diphosphate, ADP, and dihydrogen phosphate ions. ADP3-(aq) + H2PO42-(aq) -----> ATP4-(aq) + H2O (l) ΔH° = 38 kJ Is the reaction endothermic or exothermic?

A chemist measures the energy change AH during the following reaction: 2 HgO(s) → 2 Hg(1)+0,(9) AH=182. kJ Use the information to answer the following questions. endothermic. This reaction is... x10 exothermic. Suppose 61.0 g of HgO react. Yes, absorbed. Yes, released. Will any heat be released or absorbed? No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. |kJ Round your answer to 3 significant digits.

AH Changes sign when a Click on the process is reverNod screen when you started and its derivative demonstrate that the reaction enthalpy, AH, changes sign when a process is reversed. button within the activity and analyze the relationship between the two reactions that are displayed. The reaction that was on the 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 Hint(s) ? HA Value Units

cellus_engine.html?ClassID=527350766# 1.00 g of sucrose, C12H22O11, reacts with excess oxygen in a bomb calorimeter with a heat capacity of 12.5 kJ/°C. The initial temperature is 22.0 °C and the final temperature is 23.3 °C. What is the enthalpy of the reaction? AH: [?] kJ/mol Enter either a + or - sign AND the magnitude. Do not round until the end. Use significant figures. AH, rxn (kJ/mol) Enter

How much did our sodium-in-water demonstration raise the temperature of water in the dessicator jar?  The reaction we performed was:                   Na(s) + H2O(l)    NaOH(aq) + 1/2H2(g)                               qreaction = rHo = -184 kJ/mol-rxn Assuming the dessicator jar is well insulated (like our coffee-cup calorimeter), the energy balance is:                  0 = qsystem = qreaction + qwater    qreaction = -qwater                  qreaction = -mwater*Cwater*Twater The data from the demonstration was:  (a) 1.0 kg water, (b) 22.0oC, (d) Cwater = 4.18 J/g-K, (e) mNa = 0.21 g How many moles of sodium were added to the water (in moles)?

Activity.do?locator=Dassignment-take [References] The overall reaction in a commercial heat pack can be represented as 4 Fe(s) + 302(g) → 2 Fe,0, (s) AH =-1652 kJ a. How much heat is released when 4.00 moles of iron are reacted with excess O2? Heat = kJ b. How much heat is released when 1.00 mole of Fe2 O3 is produced? Heat = kJ c. How much heat is released when 1.30 g iron is reacted with excess O2? Heat = kJ d. How much heat is released when 10.8 g Fe and 1.90 g O2 are reacted? Heat = kJ Submit Answer Try Another Version 5 item attempts remaining