The gaseous reaction A (g) arrow 2B(g)+C(g) is found to be first order with respect to A . If the reaction is started with PA=90 torr the pressure after 10 min is found to be 180 torr . The rate constant of the reaction is

Question

The gaseous reaction A (g) arrow 2B(g)+C(g) is found to be first order with respect to A . If the reaction is started with PA=90 torr the pressure after 10 min is found to be 180 torr . The rate constant of the reaction is (A) 1.15 × 10- 3 texts- 1 (B) 2.30 × 10- 3 s- 1 (C) 3.45 × 10- 3 s- 1 (D) 4.60 × 10- 3 s- 1

Tardigrade Admin · Accepted Answer

A(g) arrow 2B(g)+C (g) ((P)0- p) 2p p Ptotal=P0+2p=180 torr p=45 torr textk = (1/ textt) ln (90/45) = 1.15 × 10- 3 texts- 1

Q. The gaseous reaction $A (g) \to 2 B (g) + C (g)$ is found to be first order with respect to $A$ . If the reaction is started with $P_{A} = 90 t orr$ the pressure after $10 min$ is found to be $180 t orr$ . The rate constant of the reaction is

$1.15 \times 1 0^{- 3} s^{- 1}$

$2.30 \times 1 0^{- 3} s^{- 1}$

$3.45 \times 1 0^{- 3} s^{- 1}$

$4.60 \times 1 0^{- 3} s^{- 1}$

$A (g) \to 2 B (g) + C (g)$
$((P)_{0} - p) 2 p p$
$P_{t o t a l} = P_{0} + 2 p = 180 t orr$
$p = 45 t orr$
$k = \frac{1}{t} l n \frac{90}{45} = 1.15 \times 1 0^{- 3} s^{- 1}$

Q. The gaseous reaction A(g)→2B(g)+C(g) is found to be first order with respect to A . If the reaction is started with PA​=90torr the pressure after 10min is found to be 180torr . The rate constant of the reaction is

1.15×10−3s−1

2.30×10−3s−1

3.45×10−3s−1

4.60×10−3s−1