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Wittaler [7]
3 years ago
6

Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this li

st of thermodynamic properties.HCl(g)+NaOH(s)⟶NaCl(s)+H2O(l)
Chemistry
1 answer:
Anastasy [175]3 years ago
7 0

Answer:

-179.06 kJ

Explanation:

Let's consider the following balanced reaction.

HCl(g) + NaOH(s) ⟶ NaCl(s) + H₂O(l)

We can calculate the standard enthalpy change for the reaction (ΔH°r) using the following expression.

ΔH°r = 1 mol × ΔH°f(NaCl(s)) + 1 mol × ΔH°f(H₂O(l)) - 1 mol × ΔH°f(HCl(g)) - 1 mol × ΔH°f(NaOH(s))

ΔH°r = 1 mol × (-411.15 kJ/mol) + 1 mol × (-285.83 kJ/mol) - 1 mol × (-92.31 kJ/mol) - 1 mol × (-425.61 kJ/mol)

ΔH°r = -179.06 kJ

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How many atoms are in this formula PCl6 ?
Debora [2.8K]

The molecule is unstable and impossible to create the PCl_6

Only one way is that change the formula

  • PCl_6-

Lets look at structure(See attachment)

There are total 7atoms

  • P=1
  • Cl=6

4 0
2 years ago
Which statement best describes the total number of carbon atoms during cellular
Arisa [49]

Answer:

statement best describes the total number of carbon atoms during cellular

respiration in the fish is :

The total number of carbon atoms stays the same because the carbon from the carbon-containing food molecules is used to make molecules such as  carbon dioxide

Explanation:

Respiration : It is a process in which energy from the "food" molecule is released in the form of ATP

ATP = Adenosine Triphosphate

There are two kind of respiration process:

1. In the presence of O2 = Aerobic  Oxidation

2. In the absence of O2 = Anaerobic Oxidation

The breakdown of food into CO2 occur by three main process:

Glycolysis

Krebs cycle

Phosphorylation

The reaction for the Decomposition of the Glucose molecule is written as:

C_{6}H_{12}O_{6}+O_{2}\rightarrow 6CO_{2}+6H_{2}O+ATP

It is a oxidation - reduction reaction(Redox).

Here one substance is oxidised and other is reduced.

The number of Carbon atoms in reactant =6

It will produce = 6 CO2 in which the number of C=6

Hence ,

The total number of carbon atoms stays the same because the carbon from the carbon-containing food molecules is used to make molecules such as  carbon dioxide

4 0
3 years ago
A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a twenty-day period.  What pe
liubo4ka [24]

Answer:

2%

Explanation:

Original mass of water in glass = 10 ounces

amount that evaporates each day = 0.01 ounce

number of days = 20 days

Total amount that evaporated = 0.01 x 20 = 0.2 ounce

percentage of water that evaporated during this period = 0.2/10 x 100

                            = 2%

<em>Hence, the percentage of the original amount of water evaporated during this period is 2%</em>

7 0
3 years ago
HELPPP how many Hg grams is .25 moles of CaO??
Eva8 [605]
15.5 grams
is your anwser
6 0
4 years ago
You are given the following boiling point data. Which of the liquids would you expect to have the highest vapor pressure at room
Leokris [45]

Answer:

Diethyl ether

Explanation:

vapor pressure - the pressure exerted by the gaseous molecules on the walls of the container , is called its vapor pressure.

The compound with higher boiling point , will have lower vapor pressure ,

and the compound with lower boiling point , will have higher vapor pressure.

Hence, Boiling point and vapor pressure have inverse relation.

The vapor pressure and boiling point both, depends on the inter molecular interactions , i,e, the interaction between the molecules.  

Since, the compound with stronger inter molecular interactions, will not easily convert to gas, hence will have higher boiling point between , therefore , its vapor pressure would be less.

But the compound with less inter molecular interactions , can easily vaporize to convert to gaseous state and hence will have lower boiling point, therefore, its vapor pressure would be higher .

Among all the options , diethyl ether have lowest boiling point , hence, will have highest vapor pressure , at room temperature.

6 0
3 years ago
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