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ivann1987 [24]
3 years ago
12

II. Resuelve los siguientes ejercicios (consulta La tabla entalpias estándar de formación, que se encuentra en el apartado de do

cumentos digitales)
1. Calcula la entalpia de reacción del siguiente proceso y menciona si es una reacción endotérmica o exotérmica.
2NO(g) + O 2(g) → 2NO 2 (g)
Chemistry
1 answer:
Afina-wow [57]3 years ago
4 0

For all the people that don't speak this language This is what it says.

Solve the following exercises (see The standard formation enthalpies table, found in the digital documents section)

1. Calculate the enthalpy of the reaction for the following process and state whether it is an endothermic or exothermic reaction

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Determine the volume of a 0.800 M K2Cr2O7 solution required to completely react with 4.24 g of Cu.
Pachacha [2.7K]

<u>Answer:</u> The volume of solution required is 0.0275 L.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of copper = 4.24 g

Molar mass of copper = 63.55 g/mol

Putting values in above equation, we get:

\text{Moles of copper}=\frac{4.24g}{63.55g/mol}=0.067mol

The chemical equation for the reaction of potassium dichromate and copper follows:

K_2Cr_2O_7+3Cu+7H_2SO_4\rightarrow 3CuSO_4+Cr_2(SO_4)_3+K_2SO_4+7H_2O

By Stoichiometry of the reaction:

3 moles of copper reacts with 1 mole of potassium dichromate.

So, 0.067 moles of copper will react with = \frac{1}{3}\times 0.067=0.022mol of potassium dichromate

To calculate the volume of potassium dichromate, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

We are given:

Moles of potassium dichromate = 0.022 mol

Molarity of solution = 0.800 M

Putting values in above equation, we get:

0.08mol/L=\frac{0.022mol}{\text{Volume of solution}}\\\\\text{Volume of solution}=0.0275L

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3 years ago
PLEASE HELP !!!!! PWEASEEEEE
Fantom [35]

Answer:

A option is correct

hope it helps

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Can someone please help me, best answer gets BRAINLIEST
salantis [7]

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9839 is your answer mate .

Plz mark brainliest and follow me ❤❤❤❤

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