Need to Write a Code that can find the molecular weight of various compounds

Hi Paul! Thanks a lot!

I tried downloading the Rdisop file and encountered this error:

Error: package ?Rdisop? is not installed for 'arch=x64'

I tried downloading directly from the source using R and got this error:

Error in file(filename, "r", encoding = encoding) : 
  cannot open the connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
  cannot open: HTTP status was '404 Not Found'

So i'm not sure if the source is still there?

I also tried the Rcdk method, and received this error: 
Loading required package: rJava
Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: fun(libname, pkgname)
  error: JAVA_HOME cannot be determined from the Registry
Error: package ?rJava? could not be loaded

So! I downloaded Java and the newest rJava package from
http://www.rforge.net/rJava/
But still received this error:
Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: fun(libname, pkgname)
  error: JAVA_HOME cannot be determined from the Registry
Error: package/namespace load failed for ?rJava?

any ideas? ):

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