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(七)已知NaOH+Hcl=Nacl+H_2O+57.32千焦,而Ca(OH(?)(溶液)+H_2SO_4=CaSO_4+2H_2O+130.29千焦。导致130.29不等于2×57.32的因素是(八)从海水中提取金属镁的反应式为:Ca(OH)_2+Mg~(2+)(海水中)=Mg(OH)_2↓+Ca~(2+)
(7) It is known that NaOH + Hcl = Nacl + H_2O + 57.32 kJ and Ca (OH (?) + H_2SO_4 = CaSO_4 + 2H_2O + 130.29 kJ. The factor that causes 130.29 not equal to 2 x 57.32 is ) The reaction equation for extracting metallic magnesium from seawater is: Ca (OH) 2 + Mg ~ (2 +) (seawater) = Mg (OH) 2 + Ca2 +