Amount of Substance post tests

Question 1

How do you work out the number of atoms from say S8 where each molecule has a ring of 8 atoms
how many atoms of sulfur are there in 0.0120mol?

Answer 1

1. 0.0120 x 8 = 0.0960mol

0.0960 x [6.02 x10^23) = 5.7792 x 10^22

Question 2

Why are there no intermolecular forces in solid sulfur?

Answer 2

only one type of atom

Question 3

What does anhydrous mean?

Answer 3

there are no water of crystallisation

Question 4

Define periodicity

Answer 4

Regular repeating pattern of properties shown across different periods.

Question 5

A bronze- age shield found on Dartmoor contained 2.08 kg of tin,
calculate the number of Tim atoms in this bronze shield.

Answer 5

1. kg —-> g == 2080g

2080/118.7 = 17.253 moles

x by (6.02x10^23) = 1.05 x 10 ^25