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I am stuck on two questions from my latenite lab. Thanks for your help.

1. Suppose you perform the reaction of magnesium and hydrochloric acid in a different constant pressure calorimeter with a calorimeter constant of 12.75 J/oC. The initial temperature in the calorimeter is 22.5 oC and the final temperature after the reaction is 33.7 oC. What is the value of qcal?

2. Suppose you use a coffee cup calorimeter to measure the heat released in the neutralization reaction between sodium hydroxide and hydrochloric acid. Given the data in the table below, how much heat was released or absorbed in the reaction?


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Reid Wolff
Reid WolffLv2
10 Feb 2019

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Related questions

In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. A student heats 69.54 grams of magnesium to 98.74oC and then drops it into a cup containing 83.18 grams of water at 20.64oC. She measures the final temperature to be 33.40oC. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.54 J/oC.Assuming that no heat is lost to the surroundings calculate the specific heat of magnesium.

In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. A student heats 69.54 grams of magnesium to 98.74oC and then drops it into a cup containing 83.18 grams of water at 20.64oC. She measures the final temperature to be 33.40oC. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.54 J/oC.Assuming that no heat is lost to the surroundings calculate the specific heat of magnesium.

Part A

The aluminum cup inside your calorimeter weighs 40.95 g. You add 59.21 g of 1.0 M acetic acid solution and 49.03 g of 1.0 M sodium hydroxide solution to the calorimeter. Both solutions have an initial temperature of 20.0 oC, and the final temperature after addition is 26.8 oC. What is the heat of neutralization for the amounts of reactants used, in units of J?

Assume that:

the calorimeter is completely insulated

the heat capacity of the empty calorimeter is the heat capacity of the aluminum cup.

the density of the two solutions is the same as that of water: 1.00 g/mL.

the heat capacity of the two slutions is the same as that of water: 4.184 J g-1oC-1.

Perform all calculations without rounding, but then provide your answer to the correct number of significant figures.

View Available Hint(s)

Part B

What are the moles of the limiting reagent?

Part C

What is the molar enthalpy of neutralization determined from the calorimeter experiment, in units of kJ/mol?

Use unrounded values in your calculation, but then provide your answer to the correct number of significant figures.

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