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Mumz [18]
3 years ago
9

How many kilojoules are associated with the formation of 2 moles of HBr(g)

Chemistry
2 answers:
Lady bird [3.3K]3 years ago
4 0
HBr is formed from hydrogen gas and bromine gas as shown in the reaction below;
            H2(g) + Br2(g) = 2HBr(g)       
The reaction involves bond breaking and bond formation
Decomposition of 1 mole of HBr requires 36.4kj/mol,
But, energy used in decomposition = energy used in formation
Thus,  formation of a mole of HBr is -36.4 kj/mol
Therefore, formation of two moles of HBr would require
   (-36.4 ×2) = 72.8

≈ -73 kj/mol
Hence, the enthalpy of formation of 2 moles of HBr (ΔH) is -73 kj/mol
nexus9112 [7]3 years ago
4 0

  (-36.4 ×2) = 72.8


≈ -73 kj/mol

Hence, the enthalpy of formation of 2 moles of HBr (ΔH) is -73 kj/mol

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What type of reaction is: CaO + H2O -> Ca(OH)2? A. Combustion B. Synthesis C. Double Replacement D. Decomposition
12345 [234]

Answer:

The reaction is B. Synthesis

Explanation:

In the case of this reaction, it corresponds to a synthesis where 2 compounds (calcium oxide and water) are combined to form a new one (calcium hydroxide).

8 0
3 years ago
Which of these is an example of a physical change?
vladimir2022 [97]

Answer:

Their isn't your examples but I will give you mine

Freezing, Evaporation and so on.

6 0
2 years ago
When dissolved in water, koh behaves as an acid that forms k+ and oh- ions. a base that forms ko- and h+ ions. a base that forms
Serggg [28]

Answer:

A base that forms K⁺ and OH⁻ ions.

Explanation:

The KOH is an Arrhenius base.

A is <em>wrong</em>. A base does not form H⁺ ions.

B is <em>wrong</em>. A metal hydroxide forms K⁺ ions, not KO⁻ ions.

D is <em>wrong</em>. The metal forms K⁺ ions, KO⁻ ions.

4 0
3 years ago
how many moles of sodium are present in a sample of sodium having a mass of 137 g? (molar mass is 23.0g)
vivado [14]

Answer:

5.95 moles

Explanation:

No of moles = given mass / molar mass

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7 0
3 years ago
Select the correct hybridization for the central atom based on the electron geometry cocl2 (carbon is the central atom).
Rainbow [258]
In this compound (Phosgene) the central atom (carbon is Sp² Hybridized).

Sp, Sp² and Sp³ can be calculated very simply by doing three steps, 

Step 1:
           Assume triple bond and double bond as one bond and assign s or p to it. In this example carbon double bond oxygen is considered once and let suppose it is s. Now we are having our s.

Step 2:
          Count lone pair of electron, each lone pair counts for s and p. In this case there is no lone pair of electron on carbon, so not included.

Step 3:
          Count single bonds for s and p. As we have already assigned s to the double bond, now one p for one single bond, and other p for the other single bond.

Result:
          So, we counted 1 s for double bond, 1 p for one single and other p for second single bond. As a whole we got,

                                                       Sp²

Practice:
You can practice for hybridization of Oxygen in this molecule. Oxygen has 2 lone pair of electrons. (Hint: Sp² Hybridization)
7 0
3 years ago
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