Amounts Of Substance

Question 1

How many particles does one mole contain?

Answer 1

6.02x10^23

Question 2

What is empirical formula?

Answer 2

The simplest whole number ratio of atoms of each element present in a compound

Question 3

What is molecular formula?

Answer 3

The actual number of atoms of each element in a molecule

Question 4

How do you find the molecular formula from the empirical formula?

Answer 4

Molar mass / empirical formula = molecular formula

Question 5

How do you calculate the empirical formula?

Answer 5

Divide the mass or percentage by the Ar of each element and divide by the smallest to get a ratio

Question 6

Convert 0 degrees Celsius to kelvin

Answer 6

273K

Question 7

How many grams are there in one tonne?

Answer 7

1x10^6

Question 8

What’s the ideal gas equation?

Answer 8

pV=nRT
p=Pa
V=metres cubed
n=moles
T=K
R=8.314

Question 9

Why may you not achieve the theoretical yield in an experiment?

Answer 9

The reaction may not have completed
Other reactions may have taken place alongside the main one
Purification of the product may result in a loss of product

Question 10

What’s the limiting reagent?

Answer 10

The reactant that is not in excess and will be completely used up to stop the reaction

Question 11

What does a high atom economy mean?

Answer 11

Produce a large proportion of desired products and few waste products
Sustainable as they make the best use of natural resources

Question 12

Definition of a mole

Answer 12

The amount of substance which contains as many particles as there are atoms in 12g of carbon-12