A student dissolves 10.8 g of potassium hydroxide (KOH)in 250. g of water in a well-insulated open cup. He then observes the temperature of the water risefrom 21.0 °C to 31.5 °C over the course of 6.3 minutes.Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:коН(б) — к*(ад) + он (аg)You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3significant digits.Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known andpublished values for this reaction.O exothermicIs this reaction exothermic, endothermic, or neither?O endothermicO neitherIf you said the reaction was exothermic or endothermic, calculate the amount ofheat that was released or absorbed by the reaction in this case.kJCalculate the reaction enthalpy AHn per mole of KOH.rxnmolExplanationCheck

Mass of KOH = 10.8 g Moles of KOH = Mass / Molar mass = 10.8g / 56 g/mol = 0.193 mol Mass of…

Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of KOH. rxn

Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of KOH. rxn

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter12: Thermodynamic Processes And Thermochemistry

Section: Chapter Questions

Problem 42P

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Concept explainers

Group 15 elements

The elements of group 15 are phosphorus, nitrogen, bismuth antimony, and arsenic. The most abundant element which is present in the air is nitrogen and the percentage of nitrogen present in the air is 78%. In the free state, the elemental nitrogen is present as diatomic gas (N2). In the organic matter obtained from plants and animals, phosphorus is the dominant element present. In nucleic acids, phosphate groups are present. Phosphates are also found in teeth and bones. The other elements arsenic, bismuth, and antimony are found as sulfides. Arsenopyrite, bismuth glance, and stibnite are examples of sulfides of arsenic, bismuth, and antimony respectively.

Question

A student dissolves 10.8 g of potassium hydroxide (KOH)in 250. g of water in a well-insulated open cup. He then observes the temperature of the water rise
from 21.0 °C to 31.5 °C over the course of 6.3 minutes.
Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:
коН(б) — к*(ад) + он (аg)
You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3
significant digits.
Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and
published values for this reaction.
O exothermic
Is this reaction exothermic, endothermic, or neither?
O endothermic
O neither
If you said the reaction was exothermic or endothermic, calculate the amount of
heat that was released or absorbed by the reaction in this case.
kJ
Calculate the reaction enthalpy AHn per mole of KOH.
rxn
mol
Explanation
Check

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