Yes you can use a JR Pass, both ordinary and green, to get from Tokyo to Hiroshima.
You can take the Shinkansen Hikari to either Shin Osaka or Shin Kobe and then change to the Shinkansen Sakura to Hiroshima.
You can check times and dates using this website www.hyperdia.com, in the search details unselect Nozomi/Mizuho/Hayabusa (shinkansen) box and the private railways box. This will give you lines and trains that you can use with a JR Pass.
Comments
Yes you can use a JR Pass, both ordinary and green, to get from Tokyo to Hiroshima.
You can take the Shinkansen Hikari to either Shin Osaka or Shin Kobe and then change to the Shinkansen Sakura to Hiroshima.
You can check times and dates using this website www.hyperdia.com, in the search details unselect Nozomi/Mizuho/Hayabusa (shinkansen) box and the private railways box. This will give you lines and trains that you can use with a JR Pass.
Hope that helps.
Best regards
Japan Experience.