To prepare a 4% solution of herbicide totaling 2 gallons, how many ounces of herbicide are required?

To determine how many ounces of herbicide are needed to prepare a 4% solution totaling 2 gallons, first, it's important to convert gallons to ounces, as the final measurement is required in ounces. There are 128 ounces in a gallon. Therefore, 2 gallons would equal 256 ounces (2 x 128).

Next, calculating 4% of 256 ounces helps find the correct quantity of herbicide required. To do this, multiply the total volume (256 ounces) by the desired concentration (4%, or 0.04 in decimal form):

[

256 \times 0.04 = 10.24 \text{ ounces}

]

Since the question typically involves rounding to the nearest practical measurement, the rounded amount here is 10 ounces. This aligns with the answer choice indicating 10 ounces of herbicide, confirming that the correct amount needed for a 4% herbicide solution in a 2-gallon total is indeed 10 ounces.

This method demonstrates not only how to calculate necessary amounts for chemical dilutions but also emphasizes the importance of unit conversions and percentage calculations in practical pesticide application scenarios.