Concept explainers
Interpretation:
To determine the volume of hydrogen gas produced at STP during the 3.00 min reactions.
Concept introduction:
In a
The average
Average reaction rate
Here,
Answer to Problem 77A
The volume of hydrogen gas produced at STP during the 3.00 min reactions is 1.38 L.
Explanation of Solution
Given chemical reaction,
Also given the value of mass of Mg and Volume of H and time in table :
Time (min) | Mass of Mg (g) | Volume of H at STP (L) |
0.00 | 6.00 | 0.00 |
3.00 | 4.50 | ? |
From table, one can see that the mass of Mg decreases from 6.00 g at 0.00 min to 4.50 g at 3.00 min. So, the change in time is
Now, the mass of Mg is converted into moles by multiplying it with the conversion factor for the molar mass. Here,
Moles of Mg =
Therefore, the change in the number of moles per liter of Mg is
Using these values now we can calculate the rate of the reaction using the following reaction,
Average reaction rate
Therefore, the average reaction rate is
Now, to calculate the moles of hydrogen gas left after 3 minutes, we multiply the reaction rate by 3.00 minutes.
We know that 1 mole of an ideal gas such as hydrogen occupies 22.4 L at STP. So, to determine the volume of hydrogen gas after 3 minutes we multiply the number of moles 0.0618 mol by the factor
Therefore, the volume of hydrogen gas that was produced during the reaction is 1.38 L.
The volume of hydrogen gas that was produced during the reaction is 1.38 Lat STP during the 3.00 min reactions.
Chapter 16 Solutions
Chemistry: Matter and Change
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