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2 years ago

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When the enthalpy of products is higher than that of reactants, such a reaction is said to be endothermic.

<h3>Enthalpy</h3>

The enthalpy of a system refers to the heat content of the system.

When the enthalpy of reactants is higher than that of products in a reaction, such a reaction is said to be exothermic. On the other hand, if the enthalpy of products is higher than that of the reactants, it is endothermic.

More on the enthalpy of systems can be found here: brainly.com/question/13996238

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Hydrogen peroxide decomposes spontaneously to yield water and oxygen gas according to the following reaction equation. 2H202(aq)

inn [45]

Answer : The temperature for non-catalyzed reaction needed will be 456 K

Explanation :

Activation energy : The energy required to initiate the reaction is known as activation energy.

According to the Arrhenius equation,

$K=A\times e^{\frac{-Ea}{RT}}$

Since, the rate for both the reaction are equal.

$K_1=K_2$

$A\times e^{\frac{-Ea_1}{RT_1}}=A\times e^{\frac{-Ea_2}{RT_2}}$

$\frac{Ea_1}{T_1}=\frac{Ea_2}{T_2}$ ..........(1)

where,

$Ea_1$ = activation energy for non-catalyzed reaction = 75 kJ/mol

$Ea_2$ = activation energy for catalyzed reaction = 49 kJ/mol

$T_1$ = temperature for non-catalyzed reaction = ?

$T_2$ = temperature for catalyzed reaction = $25^oC=273+25=298K$

Now put all the given values in the above formula 1, we get:

$\frac{Ea_1}{T_1}=\frac{Ea_2}{T_2}$

$\frac{75kJ/mol}{T_1}=\frac{49kJ/mol}{298K}$

$T_1=456K$

Therefore, the temperature for non-catalyzed reaction needed will be 456 K

3 0

3 years ago

Please help I really need but this time I'm fr I don't have much time ill mark brainliest

FinnZ [79.3K]

Answer:

i fi am not wrong the correct answer is D

Explanation:

5 0

3 years ago

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Which elements make up a water molecule?

shutvik [7]

Answer:

Hydrogen and Oxygen

Explanation:

also it can be written as H2O

3 0

3 years ago

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What is the total number of atoms in CaCO3

nikitadnepr [17]

Answer:

Here you go

Explanation:

Avogadro number is 6.023 x 10(23).

A mole of CaCO3 (calcium carbonate) has one mole (Avogadro number) of Ca atoms, one mole of C atoms and 3 moles of O atoms.

7 0

3 years ago

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What is the amount in moles 3.40 g Zn

Sidana [21]

<h3>Answer:</h3>

0.0520 mol Zn

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

3.40 g Zn

<u>Step 2: Identify Conversions</u>

Molar Mass of Zn - 65.39 g/mol

<u>Step 3: Convert</u>

Set up: $\displaystyle 3.40 \ g \ Zn(\frac{1 \ mol \ Zn}{65.39 \ g \ Zn})$
Divide: $\displaystyle 0.051996 \ mol \ Zn$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

0.051996 mol Zn ≈ 0.0520 mol Zn

3 0

3 years ago