Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | Biology
No Answers Yet
Help Heng Elf! Anyone can contribute an answer, even non-tutors.
How to find the number of repeat units?
Date Posted: 7 years ago
Views: 840
Mass of polystyrene: 0.120g
Molecular mass of styrene (C6H5CH=CH2) =104 g/gmol
Let polystyrene be -(-C6H5CH-CH2-)-n
Number of moles of styrene
= 0.120/104
= 0.001154 mol
Number of molecules:
n= avogadros number x moles
= 0.001154 x 6.022x10^23
= 6.95x10^20
Go and try it yourself!
Molecular mass of styrene (C6H5CH=CH2) =104 g/gmol
Let polystyrene be -(-C6H5CH-CH2-)-n
Number of moles of styrene
= 0.120/104
= 0.001154 mol
Number of molecules:
n= avogadros number x moles
= 0.001154 x 6.022x10^23
= 6.95x10^20
Go and try it yourself!
I thought the qn is asking for number of repeat units?
360 Tutoring Program