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Standard X

Chemistry

Factors Affecting the Rate of a Chemical Reaction

At 100∘C th...

Question

At $100^{\circ}$ C the gaseous reaction $A \to$ 2B+C was observed to be of first order. On starting with pure A it is found that at the end of 10 minutes the total pressure of system is 176mm.Hg and after a long time 270mm Hg.
Initial pressure of A is:

90mm

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80mm

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70mm

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60mm

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Solution

The correct option is A 90mm
After long time the dissociation of A is complete. The dissociation of one mole of A gives 3 moles of products. At this time, total pressure is 270mm Hg. Hence, the initial pressure of $A = \frac{270}{3} = 90 m m$ .

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Q. At 373 K, a gaseous reaction

A \to 2 B + C

is found to be of first order. Starting with pure A, the total pressure at the end of 10 min. was 176 mm and after a long time when A was completely dissociated, it was 270 mm. The pressure of A at the end of 10 minutes was?

Q. At 373 K,a gaseous reaction

A \to 2 B + C

is found to be of first order.Starting with pure A,the total pressure at the end of 10 min was 176 mm of Hg and after a long time when A was completely dissociated,it was 270 mm of Hg.The pressure of A at the end of 10 minutes was:

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At 100∘C the gaseous reaction A→2B+C was observed to be of first order. On starting with pure A it is found that at the end of 10 minutes the total pressure of system is 176mm.Hg and after a long time 270mm Hg.Initial pressure of A is:

The correct option is A 90mmAfter long time the dissociation of A is complete. The dissociation of one mole of A gives 3 moles of products. At this time, total pressure is 270mm Hg. Hence, the initial pressure of A=2703=90mm.

At $100^{\circ}$ C the gaseous reaction $A \to$ 2B+C was observed to be of first order. On starting with pure A it is found that at the end of 10 minutes the total pressure of system is 176mm.Hg and after a long time 270mm Hg.
Initial pressure of A is:

The correct option is A 90mm
After long time the dissociation of A is complete. The dissociation of one mole of A gives 3 moles of products. At this time, total pressure is 270mm Hg. Hence, the initial pressure of $A = \frac{270}{3} = 90 m m$ .