18,-27,36,( ),54
A.45
B.44
C.-45
D.-44
参考答案:C
When is __________ birthday?[ ]
A. your father
B. your father's
C. you father's
已知中和热的数值是57.3KJ/mol。下列反应物混合时,产生的热量等于57.3KJ的是 [ ]
A.1mol/L稀HCl(aq)和1mol/L稀NaOH(aq)
B.500mL2.0mol/L的HCl(aq)和500mL2.0mol/L的NaOH(aq)
C.500mL2.0mol/L的CH3COOH(aq)和500mL2.0mol/L的NaOH(aq)
D.1mol/L稀CH3COOH(aq)和1mol/L稀NaOH(aq)