Apache is a server and Alfresco an application that runs over Tomcat, another server but for java applications.
So, you cannot have Apache and Tomcat listening in the same port.
In all our java stacks (like Alfresco) Apache handle all request and with file /path/to/bitnami/apps/alfresco/conf/httpd-app.conf you configure what url prefix will handle Tomcat.
For instance in your Alfresco base httpd-app.conf you should have, something like.
That means all url prefix with /share, like www.xyz.com/share will be redirected to Tomcat server through the port 8009, where Tomcat is listening.