First identify which is being oxidized and reduced. In this case, the Mg is being oxidized and the Hg is being reduced.
Mg --> Mg+2
<span>Hg+2 --> Hg+1
</span>
Then you have to balance each half reaction first with electrons before adding them together in one equation
![Mg](https://tex.z-dn.net/?f=Mg%20)
⇒
![Mg^{+2} + 2e^{-1}](https://tex.z-dn.net/?f=%20Mg%5E%7B%2B2%7D%20%20%2B%20%202e%5E%7B-1%7D%20)
and
![2Hg^{+2} + 2e^{-1}](https://tex.z-dn.net/?f=2Hg%5E%7B%2B2%7D%20%2B%202e%5E%7B-1%7D%20)
⇒
and then combine them together to form
![Mg + 2 Hg^{+2} + 2e](https://tex.z-dn.net/?f=Mg%20%2B%202%20Hg%5E%7B%2B2%7D%20%2B%202e%20)
⇒
![Mg^{+2} + 2e ^{-} + 2 Hg^{+1} + 2 e^{-}](https://tex.z-dn.net/?f=%20Mg%5E%7B%2B2%7D%20%2B%202e%20%5E%7B-%7D%20%2B%202%20Hg%5E%7B%2B1%7D%20%2B%202%20e%5E%7B-%7D%20%20%20%20)
It isn't necessary to keep the electrons but its essential to know how many there are in order to know how many are in the equation in order to calculate the reaction energy. Note: A<span>dd H+ and H2O to balance the H's and O's in acidic solution if needed.</span>
P1=836kPa
T1=54.7+273=327.7K
P2=836+79.9=915.9kPa
T2=?
T2=T1*P2/P1
=327.7*915.9/836
=359K=86 degree celsius
Answer:
3.336.
Explanation:
<em>Herein, the no. of millimoles of the acid (HCOOH) is more than that of the base (NaOH).</em>
<em />
So, <em>concentration of excess acid = [(NV)acid - (NV)base]/V total</em> = [(30.0 mL)(0.1 M) - (29.3 mL)(0.1 M)]/(59.3 mL) = <em>1.18 x 10⁻³ M.</em>
<em></em>
<em> For weak acids; [H⁺] = √Ka.C</em> = √(1.8 x 10⁻⁴)(1.18 x 10⁻³ M) = <em>4.61 x 10⁻⁴ M.</em>
∵ pH = - log[H⁺].
<em>∴ pH = - log(4.61 x 10⁻⁴) = 3.336.</em>
Answer:
Ca(s) + N₂(g) + 3O₂(g) → Ca(NO₃)₂ (s)
Explanation:
The reaction of the formation of Ca(NO₃)₂(s) , is as follows -
Ca + N₂ + O₂ → Ca(NO₃)₂
The above reaction , can be balanced by adding whole numbers ,
Hence , the balanced reaction is as follows -
Ca + N₂ + 3O₂ → Ca(NO₃)₂
The states of the respective molecules is -
the state at which the atoms are most stable or the state at which the atoms are most commonly found .
Hence ,
Calcium is most stable in solid state
Oxygen is most stable in gaseous state
Nitrogen is most stable in gaseous state
hence , the balanced reaction with all the states mentioned is as follows -
Ca(s) + N₂(g) + 3O₂(g) → Ca(NO₃)₂ (s) .