# Problem: If the experiment below is run for 60 s, 0.16 mol A remain. Which of the following statements is or are true?After 60 s there are 0.84 mol B in the flask.The decrease in the number of moles of A from t1 = 0 to t2 = 20 s is greater than that for t1 = 40 to t2 = 60 s.The average rate for the reaction from t1 = 40 to t2 = 60 s is 7.0 10-3 M/s.

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###### FREE Expert Solution
• Analyzing each statement, for Statement I: after 60 s there are 0.84 mol B in the flask

• Checking the diagrams provided, each flask showed that sum of mole A and B, regardless of the time, will always be 1. Where at: 0s, moles A = 1 mol;

20s, moles A = 0.54 moles and moles B = 0.46 moles (0.54 + 0.46 = 1)

40s, moles A = 0.30 moles and moles B = 0.70 moles (0.30 + 0.70 = 1)

• Therefore, at 60s if A is 0.16 moles, then B must be 0.84 moles (1 - 0.16 = 0.84 moles)

Statement I is true

###### Problem Details

If the experiment below is run for 60 s, 0.16 mol A remain. Which of the following statements is or are true?

1. After 60 s there are 0.84 mol B in the flask.
2. The decrease in the number of moles of A from t1 = 0 to t2 = 20 s is greater than that for t1 = 40 to t2 = 60 s.
3. The average rate for the reaction from t1 = 40 to t2 = 60 s is 7.0 10-3 M/s.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Average Rate of Reaction concept. You can view video lessons to learn Average Rate of Reaction. Or if you need more Average Rate of Reaction practice, you can also practice Average Rate of Reaction practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Tang's class at USF.