Chromium has a total of 28 neutrons. This is found because we subtract the number of protons (the atomic number) from the mass number. 52 minus 24 gives us 28. It also has 24 electrons.
Answer:
The answer to your question is 58.5 g of NaCl
Explanation:
Data
mass of NaCl = ?
mass of HCl = 40 g
mass of NaOH = 40 g
Balanced chemical reaction
HCl + NaOH ⇒ H₂O + NaCl
-Calculate the molar mass of the reactants
HCl = 1 + 35.5 = 36.5 g
NaOH = 23 + 16 + 1 = 40 g
-Calculate the limiting reactant
theoretical proportion = HCl/NaOH = 36.5 / 40 = 0.9125
experimental proportion = HCl / NaOH = 40 / 40 = 1
As the experimental proportion was higher than the theoretical proportion, the limiting reactant is NaOH.
-Calculate the molar mass of NaCl
NaCl = 23 + 35.5 = 58.5
-Calculate the experimental mass of NaCl
40 g of NaOH -------------------- 58.5 g of NaCl
40 g of NaOH ------------------- x
x = (40 x 58.5) / 40
x = 58.5 g of NaCl
Answer : The mass percentage of isopropyl alcohol in the solution is, 59.4 %
Explanation :
To calculate the mass percentage of isopropyl alcohol in the solution, we use the equation:
![\text{Mass percent of isopropyl alcohol}=\frac{\text{Mass of isopropyl alcohol}}{\text{Mass of isopropyl alcohol solution}}\times 100](https://tex.z-dn.net/?f=%5Ctext%7BMass%20percent%20of%20isopropyl%20alcohol%7D%3D%5Cfrac%7B%5Ctext%7BMass%20of%20isopropyl%20alcohol%7D%7D%7B%5Ctext%7BMass%20of%20isopropyl%20alcohol%20solution%7D%7D%5Ctimes%20100)
Mass of isopropyl alcohol = 6.68 g
Mass of isopropyl alcohol solution = 3.97 g
Putting values in above equation, we get:
![\text{Mass percent of isopropyl alcohol}=\frac{3.97g}{6.68g}\times 100=59.4\%](https://tex.z-dn.net/?f=%5Ctext%7BMass%20percent%20of%20isopropyl%20alcohol%7D%3D%5Cfrac%7B3.97g%7D%7B6.68g%7D%5Ctimes%20100%3D59.4%5C%25)
Thus, the mass percentage of isopropyl alcohol in the solution is, 59.4 %
Answer:
Kindly check explanation section.
[tectonic activity].
Explanation:
What the team of geologists were talking about is known as the continental drift. The term continental drift which was introduced in the 1500s by people like Abraham Ortelius was mot accepted because the reasons backing it were not sufficient enough. The work on Continental drift was also worked on by people like Charles Lyell, Alfred Russel and Wegener. The term continental shift is used by geologists and other scientists to explain the movement of continents over time. The movement of continents is actually the movement on tectonic plates.
Although the movement of continents has not been accepted generally in those times, there has been modern evidence to back it up such as the record on fossils found in in several continents which are similar.
Diego‘s little brother should be told that different continents move at different rate and the movement is on the tectonic plates.
98.857g Na
To find this, set up an equation as so:
4.3 mol Na = ![\frac{22.99g Na}{1 mol Na}](https://tex.z-dn.net/?f=%5Cfrac%7B22.99g%20Na%7D%7B1%20mol%20Na%7D)
Multiply everything on the top and divide that by everything on the bottom to get the final answer of 98.857g Na.
Hope this helps!