Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Question:

Consider the following reaction.

aA +bB →→ cC

whose first and second half-lives are 49.8 and 49.8 minutes respectively.  If the rate constant is equal to 0.01392 and [A]0 = 16.71,  calculate the [A] at t = 67.55 minutes.  

k = ??

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Answer:

Step 1

Given:

The half life of the reaction, (t1/2)=49.8 min.

The rate constant, (K) = 0.01392.

The initial concentration, [A]0 = 16.71

The given time, (t)=  67.55 minutes.

The remaining concentration, [A]= ????

 

 

Step 2