× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
8
5
z
4
n
4
t
4
3
k
3
x
3
r
3
m
3
j
3
c
3
New Topic  
hieunguyen288 hieunguyen288
wrote...
Posts: 44
Rep: 2 0
10 years ago
What is the mole percent of methanol in your starting solution (composed of 1.5 ml methanol and 6ml isopropanol)
Read 1805 times
2 Replies

Related Topics

Replies
wrote...
Valued Member
On Hiatus
10 years ago
Methanol density is 791,80 kg/m³ or 0,79180 g/ml. So, mass of methanol is 1.5*0,79180=1,1877g
Also, molar mass is 32.04 g mol−1, so M=m/n <=> n=m/M <=> n=1.1877/32.04 = 0,037 mol.  (rounded)

We do the same for isopropanol
Isopropanol density is 786,00 kg/m³ or 0,786 g/ml. So, its mass is: 6*0,786=4,716g.
Molar mass of isopropanol is 60,1 g/mol, so M=m/n <=> n= m/n <=> n=4,716/60,1 = 0,07846921797 = 0,078 mol (rounded)

So, the total mol are:0,037+ 0,078=0,115mol
And, the percentage of methanol mol is: 0,037 / 0,115=0,322 or 32,2% (rounded)



Please review the calculations.
hieunguyen288 Author
wrote...
8 years ago
thank you
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1136 People Browsing
Related Images
  
 107
  
 4945
  
 1053
Your Opinion
Which industry do you think artificial intelligence (AI) will impact the most?
Votes: 484

Previous poll results: What's your favorite math subject?