Explanation:
The value of 
:
![K_w=[H^+][OH^-]](https://tex.z-dn.net/?f=K_w%3D%5BH%5E%2B%5D%5BOH%5E-%5D)
a. pOH = 3.51
The sum of pH and pOH is equal to 14.
pH + pOH = 14 (at 25°C)
pH = 14 - 3.51 = 10.49
The pH of the solution is defined as negative logarithm of hydrogen ion concentration in solution.
![pH=-\log[H^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%5BH%5E%2B%5D)
![10.49=-\log[H^+]](https://tex.z-dn.net/?f=10.49%3D-%5Clog%5BH%5E%2B%5D)
![[H^+]=3.2\times 10^{-11}](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D3.2%5Ctimes%2010%5E%7B-11%7D)
is the 
concentration for an aqueous solution with pOH = 3.51 at 25°C.
b.
At a certain temperature, the pH of a neutral solution is 7.56.
Neutral solution means that concentration of hydrogen ion and hydroxide ions are equal.
![[H^+]=[OH^-]](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D%5BOH%5E-%5D)
![7.56=-\log[H^+]](https://tex.z-dn.net/?f=7.56%3D-%5Clog%5BH%5E%2B%5D)
![[H^+]=2.754\times 10^{-8} M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D2.754%5Ctimes%2010%5E%7B-8%7D%20M)
The value of at at this temperature:
![K_w=[H^+][H^+]](https://tex.z-dn.net/?f=K_w%3D%5BH%5E%2B%5D%5BH%5E%2B%5D)
The value of at at this temperature is 
.
Avagadro's number is just a measurement. One mole is 6.022 X 10^23 of anything - atoms, molecules, marbles... anything.
<span>1) If one mole = 6.022 X 10^23, then 8.00mol of H2S is: </span>
<span>(3.00mol H2S) (6.022 X 10^23 molecules H2S / 1 mol H2S) = 1.8060 X 10^24 molecules H2S. </span>
<span>Rounded to 3 sig figs =1.81 X 10^24 molecules H2S
</span>part2.
<span> This one uses moles in the stoichiometric sense as well as the measurement. One formula unit of MgCl2 contains 1 mole Mg and 2 moles Cl. </span>
<span>First, figure out how many moles of formula units there are. </span>
(1.81 X 10^24 FU's) (1mol MgCl2 / 6.022 X 10^23 FU's) = 3.0056mol MgCl2.
<span>Now, we know that there are 2 moles of Cl in every mole of MgCl2 (2 Cl atoms in every unit of MgCl2). From this we can determine how many moles of Cl atoms there are: </span>
<span>(3.0056mol MgCl2) (2mol Cl atoms / 1mol MgCl2) = 6.0112mol Cl atoms. </span>
<span>Now round to 3 sig figs = 10.0mol Cl atoms</span>
D. 2- youre adding two negative charges to a neutral element
Answer:
2CH3OH + 3O2 --> 2CO2 + 4H2O
This is called Combustion of Methanol
Explanation:
Count the numbers of atoms on each sides and try to get the same amount of quantity on each sides, so you'll eventually get "balanced".
or
Watch this video: "How to Balance CH3OH + O2 = CO2+ H2O (Combustion of Methanol)"
Good luck with future work! Keep studying chemistry!
- D
Answer: 2m/s^2
Explanation:
Velocity of skateboard = 20.0 m/s.
Time taken = Ten seconds (10 s)
Acceleration = ?
Recall that acceleration is the change in velocity of a body per unit time.
i.e Acceleration = (velocity / Time)
Acceleration = 20.0m/s ➗ 10 s
Acceleration = 2m/s^2
Thus, Jeffrey acceleration was 2m/s^2
