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2 years ago

Calculate the enthalpy for the reaction D + F = G + H using

Chemistry

1 answer:

Iteru [2.4K]2 years ago

5 0

The enthalpy for the reaction : ΔH = -132

<h3>Further explanation</h3>

Given

Reaction and the enthalpy

Required

the enthalpy

Solution

Hess Law

Reaction 1 reverse :

A + B = G + C ΔH = -277

Reactions 2 and 3 remain the same (unchanged)

C + F = A ΔH = 303

D = B + H ΔH = -158

Add up all the reactions and remove the same compound from two different sides

D + F = G + H ΔH = -132

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How many liters is 1.9 mol of Cl2 at STP?

Lena [83]

Answer:

V = 42.6 L

Explanation:

Given data:

Number of moles of Cl₂ = 1.9 mol

Temperature and pressure = standard

Volume occupy = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

By putting values,

1 atm × V = 1.9 mol ×0.0821 atm.L /mol.K × 273.15 k

V = 42.6 atm.L / 1 atm

V = 42.6 L

8 0

2 years ago

Although both N2 and 02 are naturally present in the air we breathe, high levels of NO and NO2 in the atmosphere occur mainly in

joja [24]

Answer:

(a) Increasing the temperature adds heat which is a reactant shifting the equilibrium rightwards.

(b) Pressure has no effect since the change in the number of moles is zero.

Explanation:

Hello,

In this case, one could represent the given reaction as:

$N_2(g)+O_2(g)+ \Delta _rH \leftrightarrow 2NO$

Since it is endothermic. Thus, solving the (a) statement, one identifies the heat as a reagent, that is why the reaction cools down as it progress, therefore, by increasing the temperature, heat is added, that is, a reagent is added, which shifts the equilibrium rightwards, in other words, more NO is produced so its concentration increases.

Furthermore, for the (b) statement, since the change in the number of moles is zero, based on the stoichiometric coefficients as shown below:

$\Delta \nu =2-1-1=0$

Such value implies that the pressure has no effect on the concentration, taking into account the following form of the law of mass action:

$Kp=Kc(RT)^{\Delta \nu }$

Thus, since $\Delta \nu =0$ , $Kp=Kc$ , so no effect in concentration is due to the pressure.

Best regards.

6 0

3 years ago

What is the hydrogen ion concentrate of orange juice that has a ph of 1

enot [183]

ITS HYDROGEN IONS CONCERNTATION IS MORE BECAUSE ON THE LEFT SIDE OF PH SCALE THERE IS INCREASING OF H+ IONS AND PH IS LESS THAN 7 IS MORE ACIDIC IN NATURE

6 0

3 years ago

Read 2 more answers

2 questions, please help!!

Amanda [17]

i'd go for universal indicator, bromothymol blue and methyl red

i mean, they have the degrees of acidity (specific color changes)

they have wider ranges of color changes which will lead to the strength of acid

you will know the degree of acidity of the cosmetics

in fact, bromothymol blue is used to detect the slightest level of acid or base in a substance

universal indicator has the pH charts; the range is big so that you can measure the level of acidity effectively

methyl red is sensitive too as the other two mentioned earlier

the other way that's not included in your choices is the pH meter

unlike litmus papers which just have 2 results; either red or blue

phenolphthalein only colorless, pale pink

you won't know the degree of acidity

hope that helps

7 0

2 years ago

Suzy steps on the scale and measures her weight to be 125 lbs. How much

igor_vitrenko [27]

Answer:

125 lbs would round to C. 56.8kg

3 0

3 years ago