# Standard Enthalpy of Reaction Question

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter with a total heat capacity of 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using these data, calculate the standard enthalpy of reaction.

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#### Solution Preview

SOLUTION:

First, find the q from this reaction to arrive at internal energy, deltaU

q=448J/K * (-21.1K)

q=-9452.8J

Since the system is closed off, the volume is constant, so q is the ...

#### Solution Summary

How do you calculate the standard enthalpy of a reaction from data taken from an experiment? All of the math necessary to solve this problem is given.

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