What is the amount of heat required to completely melt a 200.-gram sample of H20(s) at STP?
1.
334 J
2
836 J
3
66 800
4
452 000 J
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Ответ:
H2SO4→2H++SO4−
⇒ 1 mole acid produce 2 mole H+
[H+]=0.05×2=0.10
pH=−log(0.05×2)=1