Try Magic Notes and save time.Try it free
Try Magic Notes and save timeCrush your year with the magic of personalized studying.Try it free
Question

# A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 72 J of heat while 35 J of work is done on it. Step 2: The system absorbs 35 J of heat while performing 72 J of work. Calculate ΔE for the overall process.

Solution

Verified
Step 1
1 of 4

We first calculate the energy change ($\Delta E$) of the system on the first step. Heat ($q$) was $\textit{absorbed}$, so the system gains energy $\text{\underline{(positive $q$)}}$. Work ($w$) was $\textit{done to the system}$, so it gains energy again $\text{\underline{(positive $w$)}}$:

\begin{align*} \Delta E_1 &= q + w\\ &= \mathrm{72~J + 35~J}\\ &= \mathrm{107~J} \end{align*}

## Recommended textbook solutions

#### Chemistry: The Molecular Nature of Matter and Change

7th EditionISBN: 9780073511177 (2 more)Patricia Amateis, Silberberg
6,032 solutions

#### Chemistry

9th EditionISBN: 9781133611097 (3 more)Steven S. Zumdahl, Susan A. Zumdahl
5,907 solutions

#### Chemistry

10th EditionISBN: 9781305957404 (1 more)Donald J. DeCoste, Steven S. Zumdahl, Susan A. Zumdahl
6,108 solutions

#### Chemistry, AP Edition

10th EditionISBN: 9781305957732 (1 more)Donald J. DeCoste, Steven S. Zumdahl, Susan A. Zumdahl
6,142 solutions