MYTUTOR SUBJECT ANSWERS

347 views

Predict the effect of an increase in pressure and temperature on the production of ammonia in the reaction: N2(g) + 3H2(g) <-> 2NH3 (g) , where the change in enthalpy is -92.4 kJ

An increase in temperature and an increase in pressure will have contradictory effects on the reaction.

The effect of an increase in the temperature of a system, on the equilibrium of a reaction, is dependent on whether the reaction is endothermic (positive change in enthalpy) or exothermic (negative change in enthalpy).

The forward reaction is exothermic since the change in enthalpy is negative. If we increase the temperature of the system the extra heat energy is converted into chemical energy. Thus, the position of equilibrium moves towards the endothermic reaction. In the case of our reaction an increase in temperature would shift the position of equilibrium towards the endothermic backwards reaction, reducing the yield of ammonia produced.

A change in pressure will only have an effect on equilibria involving gaseous molecules. An increase in pressure results in more molecules per area within the system. The effect of this upon the position of equilibrium is dependent on the gas molecules on either side of equilibrium. The system reacts to an increase in pressure by favouring a reduction in pressure. Since we have four gas molecules on the left and two on the right of our reaction, an increase in pressure will shift the position of equilibrium to the right, favouring the forward reaction and increasing the overall yield of ammonia produced.

Aaron S. A Level Biology tutor, GCSE Biology tutor, A Level Chemistry...

7 months ago

Answered by Aaron, an A Level Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

97 SUBJECT SPECIALISTS

£20 /hr

Maia P.

Degree: Medicine (Bachelors) - Oxford, Pembroke College University

Subjects offered:Chemistry, Science+ 5 more

Chemistry
Science
Maths
Biology
.BMAT (BioMedical Admissions)
-Oxbridge Preparation-
-Medical School Preparation-

“Relaxed and friendly Oxford medical student with a genuine desire to see others succeed! ”

MyTutor guarantee

£20 /hr

Karishma D.

Degree: Medicine (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Maths+ 3 more

Chemistry
Maths
Biology
-Personal Statements-
-Medical School Preparation-

“Hi guys, I'm a first year medical student at Imperial College London. I chose this degree because it indulges my passion for science whilst allowing me to interact with people, putting what I learn in the lecture theatre into practise...”

£22 /hr

Natasha L.

Degree: Medicine (Other) - Bristol University

Subjects offered:Chemistry, Human Biology+ 8 more

Chemistry
Human Biology
English Literature
English Language
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“Hey! I'm Tash, a 3rd year medical student offering Science and English tutoring and pre-university mentoring. I can't wait to meet you and help you out! ”

About the author

£20 /hr

Aaron S.

Degree: Experimental Pharmacology and Therapeutics (Masters) - University College London University

Subjects offered:Chemistry, Biology+ 1 more

Chemistry
Biology
-Personal Statements-

“My Name is Aaron, I recently graduated with first class honours degree in Biochemistry and am currently undertaking a MSc degree in Experimental pharmacology and therapeutics. I have gained experience tutoring from mentoring undergrad...”

MyTutor guarantee

You may also like...

Other A Level Chemistry questions

Describe the trend in the reactivity of group 2 elements with chlorine as you descend down the group.

Why is phenylamine a weaker organic base than ethylamine?

Why are transition metal complex ions coloured?

Proton NMR Made Easier

View A Level Chemistry tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok