AppleScript: Open URL in specific tab (Google Chrome)
This works for me on the latest version of macOS Sierra

set myLink to "https://google.com/"

tell application "Google Chrome"
    tell its window 1
        set theTabs to count of tabs -- how mmany open tabs
        set URL of tab 1 to myLink -- insert desired tab
        --set URL of (make new tab) to myLink
    end tell
end tell