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Tpy6a [65]
4 years ago
7

The element X has 2 valence electrons. its is a

Chemistry
1 answer:
Lesechka [4]4 years ago
6 0

helium, beryllium, magnesium, calcium, strontium, barium, radium. i believe any of these are proper answers.


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Which of the following has a higher electronegativity oxygen or selenium?
vovikov84 [41]
I think it is oxygen
6 0
4 years ago
Calculate the pH of the cathode compartment solution if the cell emf at 298 K is measured to be 0.660 V when (Zn^2+)=0.22 M and(
yaroslaw [1]

Answer:

pH = 2.059

Explanation:

At the Cathode:

The reduction reaction is:

2H^+ + 2e^- \to H_2   \ \ \ \mathbf{E^0_{red}= 0.00 \ V}

At the anode:

At oxidation reaction is:

Zn \to Zn^{2+} +2e^-   \ \ \ \mathbf{E^0_{ox} = 0.76 \ V}

The overall equation for the reaction is:

\mathbf{Zn + 2H^+ \to Zn^{2+} + H_2}

The overall cell potential is:

\mathbf{E^0_{cell}= E^0_{ox} + E^0_{red}}

\mathbf{E^0_{cell}= 0.76 \ V +0.00 \ V}

\mathbf{E^0_{cell}= 0.76\ V}

Using the formula for the Nernst equation:

E = E^0 - ( \dfrac{0.0591}{n})log (Q)\\

where;

E = 0.66

(Zn^2+)=0.22 M

Then

0.66 =0.76- ( \dfrac{0.0591}{2})log \bigg ( \dfrac{[Zn^{2+} ] PH_2}{[H^+]^2} \bigg )

0.66 =0.76- 0.02955 * log \bigg ( \dfrac{0.22*0.87}{[H^+]^2} \bigg )

3.4 = log ( 0.1914) - 2 log [H⁺]

3.4 = -0.7180 - 2 log [H⁺]

3.4 + 0.7180 = - 2 log  [H⁺]

4.118  = - 2  log  [H⁺]

pH = log [H⁺] = 4.118/2

pH = 2.059

8 0
3 years ago
How many atoms are in 8 grams of helium
Mrrafil [7]
12 x 10^23 atoms, i hope this helps
8 0
3 years ago
A student finds that 4700 J of heat are required to raise the temperature of 250.0 g of metal X from 22°C to 63°C. Based on the
Ilya [14]

Explanation:

the answer and explanation is in the picture

please like and Mark as brainliest

5 0
3 years ago
0.450 moles of NaCl are dissolved in 95.0 mL of water. Calculate the molarity of the NaCl solution.
Anarel [89]

Answer:

0.0188 mol

Explanation:

4 0
4 years ago
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