1) since temperature is drop during reaction it means heat is absorbed in reaction so it is endothermic reaction.
2) mass of solution = 15 + 250 = 265 gm
Let specific heat of solution is 4.2 J / gm C
( Assumed solution is extremely diluted)
Heat absorbed = ( 265 gm ) x ( 4.2 J / gm0 C ) x 4 0C = 4452 J
Ans is 4.45 KJ
3) moles of NH4Cl = 15 gm / 53.49 gm mol--1 = 0.28 mol
Since 0.28 mol absorbed heat = 4.45 KJ
So heat absorbed by 1 mol = 4.45 KJ / 0.28 mol = 15.9 KJ / mol
A student dissolves 15.0 g of ammonium chloride (NH,CI) in 250. g of water in a...
A student dissolves 12.1 g of potassium chloride (KCl) in 250. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 21.0 °C to 17.1 °C over the course of 6.9 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: KCl(s) → K (aq) + Cl (aq) You can make any reasonable assumptions about the physical properties of the...
A student dissolves 10.3 g of sodium chloride (NaCl) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water fall from 22.0°C to 21.5°C over the course of 4.4 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NaCl(s) - Na (aq) + Cl" (aq) You can make any reasonable assumptions about the physical properties of the solution. Be...
A student runs two experiments with a constant-volume "bomb" calorimeter containing 1200. g of water (see sketch at right). thermometer stirrer water First, a 8.000 g tablet of benzoic acid (C H CO,H is put into the "bomb" and burned completely in an excess of oxygen. (Benzoic acid is known to have a heat of combustion of 26.454 kJ/g.) The temperature of the water is observed to rise from 12.00 °C to 48.74 °C over a time of 11.3 minutes....
The salt ammonium chloride dissolves in water according to the reaction: NH_CI) —NH4+ (aq) + Cl(aq) (a) Calculate the standard enthalpy change AH° for this reaction, using the following data: AH NHACI() = -314.4 kJ mol-1 AHNH4+(aq) = -132.5 kJ mol-1 AH; Cr(aq) = -167.2 kJ moll kJ (b) Calculate the temperature reached by the solution formed when 36.8 g of NH4Cl is dissolved in 0.186 L of water at 23.7 °C. Approximate the heat capacity of the solution by...
The salt ammonium chloride dissolves in water according to the reaction: NH4Cl(s) NH4+(aq) + Cl-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: NH4Cl(s) = -314.4 kJ mol-1 NH4+(aq) = -132.5 kJ mol-1 Cl-(aq) = -167.2 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 35.3 g of NH4Cl is dissolved in 0.160 L of water at 24.6 °C. Approximate the heat capacity of the solution by the heat capacity...
Incorrect Your answer is incorrect • Row 2: Your answer is wrong. In addition to checking your math, check that you used the right data and DID NOT round any intermediate calculations • Row 3: Your answer is wrong. In addition to checking your moth, check that you used the right data and DID NOT round any intermediate calculations. thermometer stimer A student runs two experiments with a constant volume "bomb" calorimeter containing 1500 g of water (see sketch at...
The salt ammonium perchlorate dissolves in water according to the reaction: NH4ClO4(s) NH4+(aq) + ClO4-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: NH4ClO4(s) = -295.3 kJ mol-1 NH4+(aq) = -132.5 kJ mol-1 ClO4-(aq) = -129.3 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 33.9 g of NH4ClO4 is dissolved in 0.196 L of water at 23.4 °C. Approximate the heat capacity of the solution by the heat capacity...
(1): When a 1.48-g sample of solid ammonium nitrate dissolves in 56.4 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 22.00 oC to 20.09 oC. Calculate H in kJ/mol NH4NO3 for the solution process. NH4NO3(s) NH4+(aq) + NO3-(aq) The specific heat of water is 4.18 J/g-K. Hsolution = __kJ/mol NH4NO3. (2): The reaction S2O82-(aq) + 3 I-(aq) 2 SO42-(aq) + I3-(aq) was studied at a certain temperature with the following results: Experiment [S2O82-(aq)] (M)...
#8 10. Rewrite the nee d ed Part II. Dissolution of malum chloride a water Section A 1. Initial appearance of equilibrium m e Clear 2. Change after addition of cone HICH cloudy Nhile 3. Change after heating mature for 3-4 min Clear 4. Change after cooling mixture Section B Cloudy White Observations of dissolution of solid NH.C in water, The dissolution is cold, Conclusions 5. The equation for the dissolution of NHCl in water is: NH.C($) 5 NH' (aq)...
1. Instant cold packs used to ice athletic injuries on the field contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following reaction: NH4NO3 (s) à NH4 (aq) + NO3- (aq) In order to measure the enthalpy change for this reaction, 1.25 g of NH4NO3 was dissolved in 25.0 g of water. The initial temperature was 25.8 ° C and the final temperature (after all solid...