Calculate the atom economy for making hydrogen when zinc is reacted with HCL?

So, there are two parts to this question. 

Firstly, you need to decode the words in the question and transform this into an equation. 

From chemical knowledge, you know: acid + metal --> salt + hydrogen 

So now: HCL + Zn --> ZnCl2 + H2 .... then we balance this to give: 2HCL + Zn --> ZnCl2 + H2 

Secondly, we need to recall the atom economy equation (Mr of desired product / Mr sum of all products  x 100) i.e. what you need/everything produced  x 100  

Desired product Mr i.e. of H2 is: 1 x 2 = 2

All products Mr i.e. ZnCl2 + H2 is: 65 + (2 x 35.5) + (1 x 2) = 138 

2/138 x100 =1.45% :)

Pooja D. GCSE Chemistry tutor, A Level Chemistry tutor, GCSE Biology ...

11 months ago

Answered by Pooja, a GCSE Chemistry tutor with MyTutor

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


£22 /hr

Erato A.

Degree: Biomedical Sciences (Bachelors) - Queen Mary, London University

Subjects offered:Chemistry, Maths+ 3 more

-Personal Statements-
-Medical School Preparation-

“Making students feel empowered and motivated while building good bases before entering to the next level of education.”

William S. 11 Plus Maths tutor, A Level Maths tutor, 13 plus  Maths t...
£18 /hr

William S.

Degree: Medicine (Other) - St. Andrews University

Subjects offered:Chemistry, Physics+ 2 more

Further Mathematics

“I am a medical student at the university of St Andrews. I have always loved maths and sciences, and hope to share that passion with you too! I am patient and very friendly, so hopefully you will enjoy our sessions. Of course, you will...”

£20 /hr

Emily P.

Degree: Psychology (Bachelors) - Exeter University

Subjects offered:Chemistry, Psychology+ 4 more

English Literature
English Language
-Personal Statements-

“Experienced tutor currently studying at a top UK university, I am excited to help you achieve the best grades for you! ”

About the author

£22 /hr

Pooja D.

Degree: Medicine (Bachelors) - Birmingham University

Subjects offered:Chemistry, Science+ 6 more

-Personal Statements-
-Medical School Preparation-

“I have tutored for the past 4 years and have gathered many ways of teaching concepts to students in a way that is easily-digestible and understandable. ”

You may also like...

Posts by Pooja

Calculate the atom economy for making hydrogen when zinc is reacted with HCL?

How do you write your statement to appeal to the requirements of different universities?

What is the difference between mitosis and meiosis?

Other GCSE Chemistry questions

What is the difference between the atomic number and the mass of an element?

What is the bonding structure of a metal

What is an ionic substance? Are ionic substances good conductors of electricity?

Why are alkanes saturated and alkenes unsaturated?

View GCSE 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