Answer:
The period 4 alkaline-earth metal has the name Calcium. An isotope of this element having 20 neutrons has a mass number of 40.
Explanation:
Looking at the periodic table 4th row for the alkaline-earth metal, we can find Calcium which has an atomic number of 20 (or protons number, or z). The mass number is given by the sum of protons and neutrons. If the number of protons in this case is 20 and the number of neutrons is also 20, the mass number A = 40.
Answer: The standard entropy of vaporization of ethanol is 0.275 J/K
Explanation:

Using Gibbs Helmholtz equation:

For a phase change, the reaction remains in equilibrium, thus 

Given: Temperature = 285.0 K

Putting the values in the equation:


Thus the standard entropy of vaporization of ethanol is 0.275 J/K
Answer:
7 is the only basic number on a pH scale
Answer:
all these are physical properties except release of heat so it's probably heat energy given off
The substance that will form a solution when mixed with solid sodium chloride would be CH₂OH
<h3>Solubility of NaCl</h3>
A solution is only formed when a solute dissolves in a solvent.
In this case,
and CH₂OH are the only liquid solvents. However, NaCl is insoluble in
while it is soluble in CH₂OH due to its polarity.
Thus, NaCl can form a solution only with CH₂OH.
More on formation of solutions can be found here: brainly.com/question/13469356
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