**Question 4**HI can react to form hydrogen and iodine as shown in the reaction below. When this occurs a small amount of heat is given off.\[ 2 \text{HI (g)} \rightarrow \text{H}_2 \text{(g)} + \text{I}_2 \text{(g)} \](Hint: Think about your gas laws. Will the volume of the system be expanding, contracting, or staying the same?)- o \[ w<0, q>0 \]- o \[ w<0, q<0 \]- o \[ w>0, q>0 \]- o \[ w=0, q<0 \]- o \[ w>0, q<0 \]- o \[ w=0, q>0 \]**Hint:**- Endothermic, \[ q > 0 \]- Exothermic, \[ q < 0 \]When a system expands we say work is done BY the system (on the surroundings).When a system contracts, we say work is done ON the system (by the surroundings).What happens if a system neither expands nor contracts?

The balanced chemical equation is: 2HI(g) → H2(g) + I2(g) Number of gaseous moles on the reactant side = 2 Number of gaseous moles on the product side = 1+1 = 2 Change in gaseous moles, ∆ng = 2-2 = 0 Since the change in gaseous moles is 0, there is no change in volume. Hence ∆V = 0 The formula for work done is, w = - Pextx∆V => w = - Pextx0 => w = 0 Since heat is given off by the reaction, the reaction is exothermic. Hence q < 0 Hence 4th option: w = 0 and q < 0 is correct

Science

Chemistry

HI can react to form hydrogen and iodine as shown in the reaction below. When this occurs a small amount of heat is given of 2 HI (g) → H₂(g) + 12 (g) (Hint: Think about your gas laws. Will the volume of the system be expanding, contracting, or staying the same?) w<0, q>0 Ow<0, q<0 Ow>0, q>0 Ow=0, q<0 Ow>0, q<0 Ow=0, q>0

HI can react to form hydrogen and iodine as shown in the reaction below. When this occurs a small amount of heat is given of 2 HI (g) → H₂(g) + 12 (g) (Hint: Think about your gas laws. Will the volume of the system be expanding, contracting, or staying the same?) w<0, q>0 Ow<0, q<0 Ow>0, q>0 Ow=0, q<0 Ow>0, q<0 Ow=0, q>0

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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