Answer:
<h2>Molarity = 7 mol / L</h2>
Explanation:
Since the mass of NaCl and it's volume has been given we can find the molarity by using the formula
<h3>

</h3>
where
C is the molarity
m is the mass
M is the molar mass
v is the volume
From the question
v = 0.5 L
m = 205 g
We must first find the molar mass and then substitute the values into the above formula
M( Na) = 23 , M( Cl) = 35.5
Molar mass of NaCl = 23 + 35.5 =
58.5 g/mol
So the molarity of NaCl is

C = 7.00854
We have the final answer as
<h3>Molarity = 7 mol / L</h3>
Hope this helps you
ions because it’s still the same element, however the charge has changed
Answer:
2.1 x 10^24
Explanation:
The number of atoms in a mole will always be the same. The fact that it's lithium is completely irrelevant.
One mole of anything is 6.022 x 10^23 atoms
So if we need to find the number of atoms in 3.5 mol we just need to multiply Avogadro's number by 3.5
3.5 x 6.022 x 10^23
= 21.077 x 10^23
To make it proper scientific notation the first number can't be greater than 10 so let's move the decimal place and increase the exponent
2.1077 x 10^24
Remove the numbers that aren't significant figures
2.1 x 10^24
Boom there's your answer
Hello!
To solve this question, we first have to know the
pKa of the acid:

Now, we can apply the
Henderson-Hasselbach's equation to determine the pH of the buffer solution:
![pH=pKa+ log( \frac{[NaA]}{[HA]} )= 6,25 + log(\frac{(0,609 mol/2L)}{(0,506 mol/2L)})=6,33](https://tex.z-dn.net/?f=pH%3DpKa%2B%20log%28%20%5Cfrac%7B%5BNaA%5D%7D%7B%5BHA%5D%7D%20%29%3D%206%2C25%20%2B%20log%28%5Cfrac%7B%280%2C609%20mol%2F2L%29%7D%7B%280%2C506%20mol%2F2L%29%7D%29%3D6%2C33%20)
So, the
pH of this buffer solution is 6,33Have a nice day!
Answer:Heat is a type of ENERGY. When absorbed by a substance, heat causes inter-particle bonds to weaken and break which leads to a change of state (solid to liquid for example). Heat causing a phase change is NOT sufficient to cause an increase in temperature.
Explanation: