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arsen [322]
2 years ago
11

The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement?

Chemistry
2 answers:
LiRa [457]2 years ago
4 0
A negative formation enthalpy means that the reaction is exothermic, or that heat is released during the process.
(C,)
Klio2033 [76]2 years ago
3 0

The negative enthalpy of formation of water infers that heat is released during the process.

Answer: Option C

<u>Explanation:</u>

Enthalpy is the measure of internal energy of the system with pressure and volume. And Enthalpy of formations are the measure of change in enthalpy occurred during the formation of products from its elements.

The enthalpy of formation can be defined as the change in enthalpy required to form 1 mole of products from its element. Thus it can be either negative value or positive value. So if the enthalpy of formation is negative that means the heat is released during the process.

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Write a balanced half-reaction for the oxidation of liquid water H2O to aqueous hydrogen peroxide H2O2 in basic aqueous solution
nignag [31]

Answer : The balanced half-reaction in a basic solution will be,

2OH^-(aq)\rightarrow H_2O_2(aq)+2e^-  

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Rules for the balanced chemical equation in basic solution are :

First we have to write into the two half-reactions.

Now balance the main atoms in the reaction.

Now balance the hydrogen and oxygen atoms on both the sides of the reaction.

If the oxygen atoms are not balanced on both the sides then adding water molecules at that side where the more number of oxygen are present.

If the hydrogen atoms are not balanced on both the sides then adding hydroxide ion (OH^-) at that side where the less number of hydrogen are present.

Now balance the charge.

  • The half reaction is :

H_2O(l)\rightarrow H_2O_2(aq)

  • Now balance the oxygen atoms.

H_2O(l)\rightarrow H_2O_2(aq)+H_2O(l)

  • Now balance the hydrogen atoms.

H_2O(l)+2OH^-(aq)\rightarrow H_2O_2(aq)+H_2O(l)

  • Now balance the charge.

H_2O(l)+2OH^-(aq)\rightarrow H_2O_2(aq)+H_2O(l)+2e^-

The balanced half-reaction in a basic solution will be,

2OH^-(aq)\rightarrow H_2O_2(aq)+2e^-

7 0
2 years ago
What is the molarity of 4.35 moles kmno4 dissolved in 750 ml of solution?
Andreyy89
M= #moles / L
 
4.35/.75 = 5.6
7 0
2 years ago
A solution is prepared by diluting 50.00 ml of 2.575 m solution of hno3 to 250.0 ml. what is the molarity of the resulting solut
larisa [96]
Thank you for posting your question here at brainly. Below are the choices that can be found elsewhere:

12.88 M 
<span>0.1278 M </span>
<span>0.2000 M </span>
<span>0.5150 M
</span>
Below is the answer:

<span>5 times diluted (250/50),so 2.575/5=0.515 M
</span>
I hope it helps. 
8 0
2 years ago
Read 2 more answers
Consider the equilibrium reaction. 4A+B↽−−⇀3C After multiplying the reaction by a factor of 2, what is the new equilibrium equat
disa [49]
8A+2B——> 6C
since you multiply by a factor of 2 you do that to each letter
4*2=8
1*2=2
3*2=6
8 0
2 years ago
Methane (CH4) reacts with excess oxygen gas (O2) to produce carbon dioxide (CO2) and water (H2O). What is the percent yield of c
musickatia [10]
(29.8 g) / [0.184 mol (44.00964 g CO2/mol)] =0.832= 83.2% yield CO2

(hope this helps)
4 0
2 years ago
Read 2 more answers
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