Es 2.
The following table relates the time and the mass of Zn during the reaction between Zn and 0.5M HNO3 :
Zn
2HNO3
H2 Zn(NO3)2
+
+
Time
0.0 s
60.0 s
120.0 s
180.0 5
Mass of Zn (g)
36.2 g
29.6 g
25.0 g
22.08
a) Calculate the reaction rate, in g/s, from time 0 to 60 s.
b) Calculate the reaction rate, in g/s, from time 120s to 180 s.
c) Explain why the rate in calculation "b" is less than that of calculation "a".