About the J-10, I have never seen official empty weight figures. Non-official figures range anywhere from 9500kg to 11250kg.
There have never been any official empty weight figures given. Only officially given figures were for J-10A variant, for maximum take off weight at 18600 kg and "normal take off weight" at 12400 kg. I emphasize the term normal there as it's such a vague term. At least maximum take off weight is something that is limited by construction of the plane, usually its undercarriage.
One COULD speculate and say that if J10A carries 2500 kg of fuel internally, another 750 kg of weapons & pylons (again assuming that's a normal A2A load of 4 missiles) and another 80-ish kg for pilot and his equipment, 20 kg for oil and another 90 kg for gun ammo (assuming 250 rounds)
There should also be a load of chaff and flares but I am not sure of its weight. F16s usually carry 120 decoys with a weight of perhaps 12 kg - but that figure does not include the actual ejector box that holds the decoys. And I am not sure if the weight of that is included in the empty weight of the a plane.
Anyway, with all the stuff mentioned we could get to 3452 kg. Substracting that from 12400 kg would yield 8948 kg. Which is quite in the ballpark of what could be expected of J10A. Given its size, its role, perhaps even its expected airframe life - and comparing all that to other planes of similar size, role etc. F-16's empty weight rose from little under 7.5 tons from its first variant to around 8.5 tons for end of the cold war, to little over 9 tons for the late 1990s. And Japanese F-2, which is perhaps also a good comparison, size wise, if slightly larger, is at 9.5 tons of empty weight.
Sorry for I don't know aerodynamic, would anybody help explaining how 2 of the aircraft carry AGM on one wing and empty pylon on the other wing? Wouldn't it cause imbalance on both wings? an AGM weight at least a few hundred kilograms.
Dropping one load and leaving other definitely causes imbalance. But planes have been dealing with such situations for decades. Even with much heavier loads, like bombs weighing 500+ kg. Flight controls compensate for the imbalance by having the control surfaces adjust. Of course, that comes with a drag penalty. And the overall penalty is usually too grave to correct for a long time. So heavier stuff like bombs are in fact usually dropped on both sides of the wing, in pairs.
Are these pylons capable of carrying air to air missiles? Ever been photographed to carry AAMs?
I've never seen a photo where those hardpoints did not carry fuel tanks (or were empty). There's a high likelihood those hardpoints are in fact not wired for any weapons on J10.
