Suppose it takes 35 min for 4.0 g of sugar to completely react with another reagent added to the flask. What would the reaction rate be?
23
To solve this question, we need to use the concept of reaction rate. Reaction rate is defined as the change in concentration of a reactant or product per unit of time. It is usually expressed as moles per liter per second (mol/L/s) or grams per liter per second (g/L/s).
In this case, we are given that it takes 35 minutes for 4.0 grams of sugar to completely react. However, to calculate the reaction rate, we need to know the concentration of the sugar solution.
Let's assume that the concentration of the sugar solution is 1.0 M (moles per liter). To calculate the reaction rate, we need to convert the given mass of sugar (4.0 g) to moles.
First, we need to find the molar mass of sugar (C12H22O11):
12.01 g/mol (carbon) + 1.01 g/mol (hydrogen) + 16.00 g/mol (oxygen) = 342.34 g/mol
Next, we can use the molar mass to convert grams to moles:
4.0 g / 342.34 g/mol ≈ 0.0117 mol
Now we have the number of moles of sugar (0.0117 mol) and the time it takes to react (35 minutes). To find the reaction rate, we divide the number of moles by the time in seconds:
0.0117 mol / (35 min × 60 s/min) ≈ 0.00000555 mol/s
Therefore, the reaction rate would be approximately 0.00000555 mol/s.
Keep in mind that this calculation assumes the concentration remains constant throughout the reaction. If the concentration changes significantly during the reaction, a different approach might be needed to determine the reaction rate accurately.