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juin [17]
2 years ago
8

How many moles are in 12.9 grams of Fe?

Chemistry
2 answers:
amid [387]2 years ago
6 0

Answer:

0.1677 is the answer

Explanation:

xeze [42]2 years ago
5 0
0.1677 is the answer
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The period 4 alkaline-earth metal has the name_______ . An isotope of this element having 20 neutrons has amass numberof _______
Cerrena [4.2K]

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.

6 0
3 years ago
Calculate the standard entropy of vaporization of ethanol, C2H5OH, at 285.0 K, given that the molar heat capacity at constant pr
MArishka [77]

Answer: The standard entropy of vaporization of ethanol is 0.275 J/K

Explanation:

C_2H_5OH(l)\rightleftharpoons C_2H_5OH(g)

Using Gibbs Helmholtz equation:

\Delta G=\Delta H-T\Delta S

For a phase change, the reaction remains in equilibrium, thus \Delta G=0

\Delta H=T\Delta S

Given: Temperature = 285.0 K

\Delta H=78.3J/mol

Putting the values in the equation:

78.3J=285.0K\times \Delta S

\Delta S=0.275J/K

Thus  the standard entropy of vaporization of ethanol is 0.275 J/K

4 0
3 years ago
Which of the following pH numbers are basic? (Choose 2)<br> 11<br> 5<br> 7<br> 9
timama [110]

Answer:

7 is the only basic number on a pH scale

8 0
2 years ago
Which is the most important question for deciding if a chemical reaction has occurred?
777dan777 [17]

Answer:

all these are physical properties except release of heat so it's probably heat energy given off

7 0
3 years ago
Read 2 more answers
Which substance will form a solution when mixed with solid sodium chloride?
s2008m [1.1K]

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, CCl4_ and  CH₂OH are the only liquid solvents. However, NaCl is insoluble in CCl_4 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

#SPJ1

4 0
2 years ago
Read 2 more answers
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