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natta225 [31]
3 years ago
13

Please help with this question... It's six marks to could you put six marks....

Chemistry
1 answer:
professor190 [17]3 years ago
3 0
Can you take a better pic cant see the questions
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Calculate the standard molar enthalpy for the complete combustion of liquid ethanol (C2H5OH) using the standard enthalpies of fo
PSYCHO15rus [73]

Answer:

Explanation:

For the reaction

C2H5OH (l) + 3 O2(g) = 2CO2(g) + 3 H2O

We can calculate the  standard molar enthalpy of combustion using the standard enthalpies of formation of the species involved in the reaction according to Hess law:

ΔHºc =  2ΔHºf CO2 (g) + 3ΔHºfH2O(l)  - ( ΔHºf C2H5OH (l) - 3ΔHºfO2 (g) )

( we were not give the water state but we know we are at standard conditions so it is in its liquid state )

The ΔHºfs can be found in appropiate reference or texts.

ΔHºc =  2ΔHºf CO2 (g)+ 3ΔHºfH2O(l)  - (  ΔHºf C2H5OH (l) -+3ΔHºfO2 (g) )

= [ 2 ( -393.52 ) + 3 ( -285.83 ) ] - [(  -276.2 + 0 ) ] kJ

ΔHºc =  -1368.33 kJ

5 0
3 years ago
Is chromium a transition metal
oksano4ka [1.4K]
No it is not

hope  this helped


7 0
3 years ago
Read 2 more answers
Describe the difference between at atom and an ion in regards to their substaomic<br> particles.
tangare [24]

Answer:

-Atoms are neutral; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.

-An atom has an equal number of protons and electrons. An ion has an imbalance between the number of protons and electrons.

-An atom has no electrical charge. Ions have an electrical charge because they have an imbalance of protons and electrons.

Explanation:

A cheerful teen willing to help,

wishing you a splendiferous day,

stay salty...

5 0
3 years ago
The eastfork forest contains pine trees, birch trees, and dogwood trees. All the trees in this forest are considered a(n) _____
Vesna [10]

Answer:

The answer is community

I got it correct

Explanation:

6 0
3 years ago
Read 2 more answers
The chemical equation for a reaction between K2Cr2O7 and HCl is shown.
deff fn [24]

K2Cr2O7 + 14HCl → 2CrCl3 + 2KCl + 3Cl2 + 7H2O

the correct option is :

K2Cr2O7, because the oxidation number of Cr changes from +6 to +3.


<u>Oxidation number of Cr in K2Cr2O7 is:</u>

K2Cr2O7 = 2K + 2 Cr + 7 O

= 2(+1) + 2Cr + 7(-2)

= 2 + 2Cr -14

[total charge on K2Cr2O7 = 0], Hence;

2 + 2Cr -14 = 0

2Cr -12 = 0

2Cr = 12

Cr = 12/2

<u>Cr = +6</u>


<u>Oxidation number of Cr in CrCl3 is:</u>

CrCl3 = Cr + 3Cl = 0

Cr + 3(-1) = 0

Cr -3 = 0

<u>Cr = +3</u>

Hence Cr is changing its oxidation number from

+6 in K2Cr2O7 to +3 in CrCl3.

Since the oxidation number of Cr [ +6 → +3] is decreasing here,

Cr is getting reduced.

 

so K2Cr2O7 is an oxidizing agent,as it is getting itself reduced and oxidizes others.

3 0
3 years ago
Read 2 more answers
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