Chapter U5.9, Problem 6E

Interpretation Introduction

Interpretation:

The energy released in a given combustion reaction for the entire pellet is to be calculated.

Concept introduction:

The unit conversion system is required to calculate the amount of energy released in a given amount of pellets.

  $1g=0.0022lb$

Answer to Problem 6E

Energy released= $1.42\times {10}^{7}cal$

Explanation of Solution

  $1g=0.0022lb$

It means

  $0.0022lb$ releases energy $=742cal$

  $\begin{array}{c}So, 42lbwillreleaseenergy=\frac{742\times 42}{0.0022}\end{array}$

           $\begin{array}{c}=1.42\times {10}^{7}cal\end{array}$

Conclusion

  $So, 42lbwillreleaseenergy=1.42\times {10}^{7}cal$.