calculate the mass required to prepare 2.5 L of 1.0 M NaOH solution. Given that the molar mass for NaOH is 40 g/mol.

Answers

Answer 1

Answer:

Answer:

$100\; \rm g$ of ${\rm NaOH}\; (s)$ would be required.

Explanation:

The quantity of solute in a solution of concentration $c$ and volume $V$ would be $n = c \cdot V$ .

It is given that volume $V = 2.5\; \rm L$ for the solution in this question. It is also given that the concentration of the $\rm NaOH$ solute in this solution is $c = 1.0\; \rm M$ , which is the equivalent to $c = 1.0\; \rm mol \cdot L^(-1)$ .

Apply the equation $n = c \cdot V$ to find the quantity of $\rm NaOH$ in this solution:

$\begin{aligned}n &= c \cdot V \n &= 1.0\; \rm mol \cdot L^(-1) * 2.5\; \rm L \n &= 2.5\; \rm mol\end{aligned}$ .

Multiply the quantity $n$ of $\rm NaOH$ in this solution with the formula mass $M$ of ${\rm NaOH}\!$ to find the corresponding mass:

$\begin{aligned}m &= n \cdot M \n &= 2.5\; \rm mol * 40\; \rm g \cdot mol^(-1) \n &= 100\; \rm g\end{aligned}$ .

Thus, this solution would contain $100\; \rm g$ of ${\rm NaOH}$ .

It would thus take $100\; \rm g$ of ${\rm NaOH}$ to prepare this solution.

Answer 2

Answer:

Answer:

The required mass to prepare 2.5 L of 1.0 M NaOH solution is 100 g

Explanation:

We do this by preparing the equation:

Mass = concentration (mol/L) x volume (L) x Molar mass

Mass = 1.0 M x 2.5 L x 40 g/mol

Mass = 100 g

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A 10.0-milliliter sample of NaOH(aq) is neutralized by 40.0 milliliters of 0.50 M HCl. What is the molarity of the NaOH(aq)?(1) 1.0 M (3) 0.25 M(2) 2.0 M (4) 0.50 M

Answers

The reaction equation of this is NaOH + HCl = NaCl + H2O. So the mol number of NaOH and HCl are the same. So we can get equation: 40*0.5=10*[NaOH]. (both side of equation is using the same unit of volume) [NaOH]=2.0 M. The answer is (2) 2.0 M.

Answer:2.0M

Explanation

A particle with 12 electrons has a -2 charge. How many protons does it have.

Answers

Well, it has 10 protons.

For, a atom in its neutral state has the same number of protons as electrons. Thatswhy, it has a neutral charge. The protons have a positive charge (1+); the elctrons have a negative charge(1-). So, the charges cancel out. Like, a atom has 11 electrons and 11 protons. See-

11 e- = -11
11 p+ = +11

Then, $+11-11 = 0$ . So, no charge. Its neutral. It happens in case of every atom.

And, if an atom has (2-) charge that means it has two extra electrons. Two more electron than the number of protons. It once had the same number of protons and electrons. Then two more electrons give it a (2-) charge. Thatswhy, if we subtract 2 from 12, we can get the number of protons.

We can calculate the number of protons as, $12-2=10$

Okay, what's the proof? Want it?

We know there are 10 protons and 12 electrons. Let's see it.

$+10-12=-2$

Eureka! That's it. I got it. It's right.

AND ANOTHER QUESTION ARISES, If all atoms have the same number of protons and electrons then, when does the number of electron decrease or increase? How do the atoms come to have positive or negative charge?

Well, this happens because of ionic bonding. I can't explain all these stuff, right here. To obtain more information on bonding, search it on GOOGLE.

What is the difference between periods and groups on the periodic table?

Answers

Periods are rows horizontally along the periodic table whereas groups are vertical columns down the periodic table.
Elements in the same group react similarly. E.g. the group 1 metals (found in the first column of the periodic table) react readily with air and water (this is the similarity) but these reactions become more vigorous / explosive as you go down the group (this is why they are similar but not the same). This is because elements in the same group have the same number of electrons in their outermost energy level (and electrons are responsible for how an element reacts)
Elements in the same period of the periodic table have the same number of inner most (also known as 'main') energy levels so have the same amount of electron shielding.

During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will (1 point).

move across the membrane to the outside of the cell.
stop moving across the membrane.
continue to move across the membrane in both directions.
move across the membrane to the inside of the cell.

Answers

During the diffusion process, when the concentration of molecules on both sides of a membrane is the same, the molecules will continue to move across the membrane in both directions.

will continue to move across the membrane in both directions.

i hope this helps you ( c )

have a wonderful day

~hailey lee~

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg