Föreläsning 2

Question 1

What are drivers to introduce Green “sustainable” Chemistry?

Answer 1

Reduce CO2 emissions, reduce waste

Reduce costs (e.g. avoid wasted rawmaterial)
Sustainable processing

Question 2

What is the three steps for calculating atom economy?

Answer 2

What is the atom economy for making hydrogen
(H2) by reacting coal (C) with steam (H2O)?
1. Which are the reactants and products?
2. Do you have any by-products? (by products are
not included in the calculation!)
3. Balance the equation.
3. Add the molecular weight of reactants and
product.
AE = [mw of product] / [sum of mw of reactants] ×
100

Question 3

How do you calculate Atom economy for this reaction?

A + B –> C

Answer 3

Atom economy (%) = ([mw of product C] / [mw of A + mw of B])*100

Formula internet: (MW desired product)/(Sum of MW of all reactants) * 100

Question 4

How do you calculate the Atom economy for this reaction?

A+B –> C
C+D –> E
E+F –> G

Answer 4

AE (%) = ([MW of G]/[MW A+MW B+ MWD + MW F])×100

So skip middle products in the denominator

Question 5

Example 1:
What is the atom economy for making hydrogen
(H2) by reacting coal (C) with steam (H2O)?

Answer 5

C + H2O ≠ H2 + CO2

Balansera C + 2H2O –> 2H2 + CO2

AE = (MW summan produkter)/(MW produkter) (ej biprodukter) )

AE = 4/(12+4+32) <-> AE = 0.083 Svar 8.3 %

Question 6

What types of yields are there?

Answer 6

*Theoretical yield: is what you calculate
the yield will be using the balanced
chemical reaction. (g)
* Actual yield is what you actually get in a
chemical reaction. (g)
* Percent yield: (actual
yield/theoretical)x100%