Very much depends on what kind of MTB you're looking for, and what you're ready to spend on it. A high-end XC(cross country) MTB can be around 20-22 lbs(less than 10 kg). For an FS DH MTB (full suspension downhill) around 35 lbs(15 kg) is more to be expected. Here is a bunch of mountain bike frames so you can see the difference in weight ratios....
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Depends on how hard you're riding it. At slow speeds over an even surface 300 kg shouldn't be a problem. But hit a curb at that load and with a bit of speed and you'll probably end up collapsing the wheels.
some do, that's just a little bit lighter than usual, as my hardtail weights 29 lbs
Really hard to tell. A race-ready XC(cross country) can be about 18 lbs, while a heavy-duty DH(downhill) bike can be 40 lbs. Freeride, all-mountain bikes will be somewhere inbetween.