Amount Of Substance

Question 1

What is the ideal gas equation?

Answer 1

pV=nRT

Question 2

What is the % yield?

Answer 2

Actual yield/ theoretic yield X100

Question 3

How do you calculate concentration in moldm-3

Answer 3

Moles/vol (dm3)

Question 4

How do you calculate concentration in gdm-3

Answer 4

Concentration in Moldm-3 X Mr

Question 5

What are concordat results?

Answer 5

Results within 0.10 of each other (including the trail experiment if 3 concordat results can’t be found)

Question 6

How do you calculate percentage purity?

Answer 6

Mass of pure substance (g) / mass of impure sample (g) X100

Question 7

How can you increase atom economy’s?

Answer 7

Find a suitable market to sell the other products

Question 8

What is % atom economy?

Answer 8

Mass of desired product / total mass of reaction X100

Question 9

What is the difference between empirical and molecular formula?

Answer 9

Empirical= smallest whole number ratio
Molecular= actual ratio

Question 10

What is relative molecular mass?

Answer 10

The average mass of one molecule relative to 1/12th the mass of a C-12 atom?

Question 11

What is relative atomic mass?

Answer 11

The weighted average mass of 1 atom of an element taking into account all naturally occurring isotopes relative to 1/12th the mass of a C-12 atom

Question 12

How do you calculate moles?

Answer 12

Mass/ Mr

Question 13

How many particles are in 1 mole of a substance?

Answer 13

6.02x10^23

Avogadro’s constant

Question 14

How do you write an ionic equation?

Answer 14

1) stoichiometric equation
2) seperate ions for (aq) solutions
3) cancel same ions

Question 15

How do you convert from C to K?

Answer 15

Add 273