I have a canon m50, and an adapter + 55-250 f4 lens, the total weight of the lens and adapter is 500gram, is it safe to install a tripod on the camera body, because my mount adapter is broken
I don't think there is a specific max weight for the lens mount, as such, I've never really seen that on any camera I've owned (modern or film) as typically heavy lenses should be supported directly and not via the camera body.
While the M50 mount is welded to the inner metal frame, this not is heavy duty. I would not recommend supporting a heavy lens with the body on a tripod (or on a carry with a strap). Now, is that lens too heavy? My rule of thumb on this is based on whether or not the lens is equipped with its own tripod collar. AFAIK, yours is not, but it's also not specifically designed for your camera. My feeling is err on the side of caution and use the lens in a supported manner.