# Lab Report

705 Words Oct 15th, 2012 3 Pages
Miguel Paulo D. Valdez
BS Chem-3

EXPERIMENT 14- Heat Effects and Calorimetry
Objective/ Introduction:

Heat is a form of energy, sometimes called thermal energy, which can pass spontaneously from an object at a high temperature to an object at a lower temperature. If the two objects are in contact, they will, given sufficient time, both reach the same temperature. Heat always travels from hot to cold objects and two objects will reach an equilibrium temperature. Heat flow is commonly measured in a device called a calorimeter, an insulating container that minimizes heat exchange between its contents and the surrounding. Heat flow in a device called a calorimeter. In this experiment, we should find the heat capacity of the
A metal sample weighing 45.2 g and at temperature of 100.0 ˚C was placed in a calorimeter containing
38.6 g of water at 25.2 ˚C. At equilibrium the temperature of the water and metal was 33.0 ˚C.

a. What was ∆T for the water?
__________ ˚C
b. What was ∆T for the metal?
__________ ˚C
c. How much heat flowed into the water (cwater = 4.184 J/g˚C)?
__________ J
d. Calculate the specific heat of the metal.
__________ J/g˚C
e. What is the approximate molar mass of the metal?
__________ g/mol

2. When 2.00 g of NaOH were dissolved in 49.0 g water in a calorimeter at 24.0 ˚C, the temperature of the solution went up to 34.5 ˚C.

a. Is the solution reaction exothermic? __________ Why?
b. Calculate q water.
__________ J
c. Find q for the reaction as it occurred in the calorimeter.
__________ J
d. Find the ∆H for the solution of 1.00 g NaOH in water.
__________ J/g
e. Find molar ∆Hsol’n for