The mole and the Avogadro constant + The ideal gas equation

Question 1

What is Avagadros Constant?

Answer 1

6.022x10^23

Question 2

how to calculate the number of particles?

Answer 2

number of moles x 6.022x10^23

Question 3

how to calculate moles?

Answer 3

mass/mr

or

(conc x volume) / 1000
^ measured in mol dm-3

Question 4

What is the ideal gas equation?

Answer 4

PV = nRT

cm3 –> m3 = x10^-6

Question 5

Answer 5

Answer: C

Explanation:
Nitrogen gas = N2 (diatomic) [mr = 2x14]
so, 6/28 =0.2142857
0.2142857 x L = 1.29 x10^23

There are 14 protons [ 1 nitrogen = 7 protons so times by 2 ]

so, 1.29 x10^-23 x 14 = 1.8 x10^24

Question 6

Answer 6

answer: D

ratio: 1:3 [0.5:1.5 simplified]

F2 is the LR.
20:60

60-20 = 40 = vol of NF3

10cm3 unreacted nitrogen.

Questions is asking for gas mixture so 10 + 40 = 50cm3