Chemistry Topic 3 - Quantitative Chemistry

Question 1

What is Avogadro constant equal to?

Answer 1

6.022 x 10^23

Question 2

What will mass of one mole be equal to?

Answer 2

To the relative atomic mass of the atom

Question 3

Formula for mole of a substance?

Answer 3

Mass of substance/ Relative mass of substance

Question 4

What’s concentration?

Answer 4

Mass of a solute in a given volume / Number of moles in a given volume of solution

Question 5

Why may a percentage yield not be 100%

Answer 5

Some product may be lost as separated from mixture
Some reactions go in different ways
Reversible reactions may not always complete

Question 6

What’s atom economy?

Answer 6

Measure of amount of starting material into useful product

Question 6

Advantages of using atom economy?

Answer 6

By minimizing production of unwanted material we save money
Increase sustainability

Question 7

Formula to find concentration of moles in a given volume

Answer 7

Concentration = Number of moles/ volume

Question 8

Formula for yield

Answer 8

yield = ( mass of product made/ theoretical mass ) x 100