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Answer is the attachment:

• [tex]the \: mass \: f \: glucose \: added \: is \: 23grams[/tex]

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To calculate the mass of glucose needed to prepare a 20% glucose solution in 115 mL of water, we need to know the following:

• The definition of a 20% glucose solution
• The density of glucose
• The volume of the glucose solution we want to prepare

First, let's define what a 20% glucose solution means. A 20% glucose solution contains 20 g of glucose per 100 mL of solution.

Next, we need to calculate the mass of glucose required to prepare a 115 mL solution.

20% glucose solution means that 100 mL of solution contains 20 g of glucose.

So, for 1 mL of solution, the mass of glucose is $\frac{20}{100}$ g = 0.2 g.

For 115 mL of solution, the mass of glucose required is:

$0.2 \text{ g/mL} \times 115 \text{ mL} = 23$ g

Therefore, we need 23 grams of glucose to prepare 115 mL of a 20% glucose solution.

[tex]\gray{\text{Hope it helps...❤}}[/tex]