Answer:
CO2
Explanation:
All of the other options are elements found on the periodic table but Carbon Dioxide are two elements.
The required volume of 0.10M NaOH solution that student will add is 20 mL.
<h3>How do we calculate the volume?</h3>
Volume of any solution which is required to prepare buffer will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
- M₁ & V₁ are the molarity and volume of NaOH solution.
- M₂ & V₂ are the molarity and volume of HF solution.
On putting values, we get
V₁ = (0.1)(20) / (0.1) = 20mL
Hence required volume of NaOH solution is 20mL.
To know more about molarity & volume, visit the below link:
brainly.com/question/24305514
#SPJ4
Since in endothermic reactions the reactants need heat (positive value):
The change in enthalpy is positive and the reactants contain more energy than the products. (A.)
I found this for your question
