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Answer:
14.3 mL
Explanation:
Assume the student used 0.113 g ascorbic acid and 0.0900 mol·L⁻¹ NaOH.
1. Balanced chemical equation.
The formula of ascorbic acid is H₂C₆H₆O₆ (MM = 176.12 g/mol).
However, for the balanced equation, let's write it as H₂A.
![\rm H_{2}A + 2NaOH \longrightarrow Na_{2}A + 2H_{2}O](https://tex.z-dn.net/?f=%5Crm%20H_%7B2%7DA%20%2B%202NaOH%20%5Clongrightarrow%20Na_%7B2%7DA%20%2B%202H_%7B2%7DO)
2. Moles of ascorbic acid
![\text{Moles of H$_{2}$A} =\text{0.113 g H$_{2}$A} \times \dfrac{\text{1 mmol H$_{2}$A}}{\text{0.176 12 mg H$_{2}$}A} = \text{0.6416 mmol H$_{2}$A}](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20H%24_%7B2%7D%24A%7D%20%3D%5Ctext%7B0.113%20g%20H%24_%7B2%7D%24A%7D%20%5Ctimes%20%5Cdfrac%7B%5Ctext%7B1%20mmol%20H%24_%7B2%7D%24A%7D%7D%7B%5Ctext%7B0.176%2012%20mg%20H%24_%7B2%7D%24%7DA%7D%20%3D%20%20%5Ctext%7B0.6416%20mmol%20H%24_%7B2%7D%24A%7D)
3. Moles of NaOH
The molar ratio is 2 mmol NaOH:1 mmol H₂A.
![\text{Moles of NaOH}= \text{0.6416 mmol H$_{2}$A} \times \dfrac{\text{2 mmol NaOH}}{\text{1 mmol H$_{2}$A}} =\text{1.283 mmol NaOH}](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20NaOH%7D%3D%20%20%5Ctext%7B0.6416%20mmol%20H%24_%7B2%7D%24A%7D%20%20%5Ctimes%20%5Cdfrac%7B%5Ctext%7B2%20mmol%20NaOH%7D%7D%7B%5Ctext%7B1%20mmol%20H%24_%7B2%7D%24A%7D%7D%20%3D%5Ctext%7B1.283%20mmol%20NaOH%7D)
4. Volume of NaOH
![V = \text{1.283 mmol NaOH}\times \dfrac{\text{1 mL NaOH}}{\text{0.0900 mmol NaOH}} = \textbf{14.3 mL NaOH}\\\\\text{The student will need $\large \boxed{\textbf{14.3 mL NaOH}}$}](https://tex.z-dn.net/?f=V%20%3D%20%5Ctext%7B1.283%20mmol%20NaOH%7D%5Ctimes%20%5Cdfrac%7B%5Ctext%7B1%20mL%20NaOH%7D%7D%7B%5Ctext%7B0.0900%20mmol%20NaOH%7D%7D%20%3D%20%20%20%5Ctextbf%7B14.3%20mL%20NaOH%7D%5C%5C%5C%5C%5Ctext%7BThe%20student%20will%20need%20%24%5Clarge%20%5Cboxed%7B%5Ctextbf%7B14.3%20mL%20NaOH%7D%7D%24%7D)
Answer:
For the first one, it's B, C, and D. Hydrothermal vents on the seabed, Underwater volcanoes, and the breaking down of rocks.
Second question is C, Fresh water from the glaciers are melting into it.
Explanation:
For the first answer, I can say that they all relate. Hydrothermal vents on the seabed usually break down rocks with their hot water, same as breaking down rocks and the underwater volcanoes as the broken down rocks they broke escape into the water, therefore making it salty.
Second answer, the glaciers are frozen up ice, almost fresh water. So if they melted and mixed into the <u>salty ocean</u>, the ratio of salt and ocean will be different, as the amount of water will be<em> </em>cleaner.
I don't know the others, for this is how much I could help. Sorry if I didn't answer in time!!
Answer:
Because CLEARLY, each mole of glucose, C6H12O6 contains 6⋅mol oxygen atoms.
Answer:
B) conducts electricity
Explanation:
This answer can be answered by the process of elimination. Metals are excellent conductors of electricity, which means A is out, and metals are also known to have medium reactivity and have high melting points, meaning C and D are also out.