For the elementary reaction 2A + B= 3C,if the rate of appearance of C at time ' t ' is 1.3*10^-4 mol L^-1 s^-1 ,calculate at this time (1) rate of reaction (2) rate of disappearance of A.

Question

For the elementary reaction 2A + B= 3C,if the rate of appearance
of C at time ' t ' is 1 3*10-4 mol L-1
s-1 ,calculate at this time (1) rate of reaction (2)
rate of disappearance of A

Priya G N · Accepted Answer

We know that for any reaction of the form:
aA + bB -> cC + dD,
the rate of a reaction is given by the formula: r = (-1/a)(rate
of disappearance of A) = (-1/b)(rate of disappearance of B) =
(1/c)(rate of appearance of C) = (1/d)(rate of appearance of D)
Given reaction : 2A + B -> 3C
Rate of appearance of C = 1 3*10-4 mol L-1
s-1
Here, c = 3
(1) Therefore, Rate of reaction = (1/3)(1 3*10-4 mol
L-1 s-1) = 0 433 *10-4 mol
L-1 s-1
(2) Also we know that rate of reaction = (-1/a)(Rate of
disappearance of A)
Here, a = 2
0 433 * 10-4 = (-1/2) (Rate of disappearance of
A)
Hence, Rate of disappearance of A = 2 * 0 433 * 10-4
= -0 867 10-4 mol L-1 s-1
-ve sign indicates A decreases over time

For the elementary reaction 2A + B= 3C,if the rate of appearance of C at time ' t ' is 1.3*10-4 mol L-1 s-1 ,calculate at this time (1) rate of reaction (2) rate of disappearance of A.

For the elementary reaction 2A + B= 3C,if the rate of appearance of C at time ' t ' is 1.3*10^-4 mol L^-1 s^-1 ,calculate at this time (1) rate of reaction (2) rate of disappearance of A.