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3 years ago

The reaction 4al (s) 3o2 (

2 answers:

8 0

The reaction 4al (s) 3o2 (
g. → 2al2o3 (s) δh° = -3351 kj is exothermic________, and therefore heat is _____release ___ by the reaction.

Hunter-Best [27]3 years ago

6 0

Answer: The reaction is exothermic and therefore the heat is released by the reaction.

Explanation:

There are 2 types of reaction based on the heat of the reaction:

Exothermic reactions are defined as the reactions in which energy is released in the form of heat. The enthalpy change $(\Delta H^o)$ of the reaction comes out to be negative for this kind of reaction.
Endothermic reactions are defined as the reactions in which energy is absorbed in the form of heat. The enthalpy change $(\Delta H^o)$ of the reaction comes out to be positive for this kind of reaction.

For the given chemical reaction:

$4Al(s)+3O_2(g)\rightarrow 2Al_2O_3(s);\Delta H^o=-3351kJ$

As, the enthalpy change of the reaction is negative. The reaction is considered as an exothermic reaction.

Hence, the reaction is exothermic and therefore the heat is released by the reaction.

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Halogen are the most reactive due to their electronic configuration

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3 years ago

When the metallic element sodium combines with the nonmetallic element bromine (Br2), is the product a solid, liquid, or gas at

Luden [163]

Answer: it is a solid at room temperature.

Explanation:

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2 years ago

A sample of octane undergoes combustion according to the equation 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O ΔH°rxn = -11018 kJ. What mas

Anna71 [15]

Answer:

$\large \boxed{\text{528.7 g} }$

Explanation:

It often helps to write the heat as if it were a reactant or a product in the thermochemical equation.

Then you can consider it to be 11018 "moles" of "kJ"

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

M_r: 32.00

2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 8H₂O + 11 018 kJ

n/mol: 7280

1. Moles of O₂

The molar ratio is 25 mol O₂:11 018 kJ

$\text{Moles of O}_{2} = \text{7280 kJ} \times \dfrac{\text{25 mol O}_{2}}{\text{11 018 kJ}} = \text{16.52 mol O}_{2}$

2. Mass of O₂

$\text{Mass of C$_{8}$H}_{18} = \text{16.52 mol O}_{2} \times \dfrac{\text{32.00 g O}_{2}}{\text{1 mol O}_{2}} = \textbf{528.6 g O}_{2}\\\text{The reaction requires $\large \boxed{\textbf{528.67 g O}_{2}}$}$

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3 years ago

The atmospheric gases in the thermosphere are heated _____. Pick the best one.

lozanna [386]

by radiation from the Earth's surface

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3 years ago

Read 2 more answers

Express each of the following answers in the IUPAC format. Do not include any capitals or spaces in your name. Separate multiple

lorasvet [3.4K]

The full question is shown in the image attached

Answer:

See explanation

Explanation:

In naming an alkane, the first thing we do is to obtain the parent chain by counting the number of carbon atoms in the chain.

When we obtain that, then we identify the substituents and number them in such a way that they have the lowest numbers. The compounds shown have the following names according to the order in which the structures appear in the image attached;

1. 2-methyl propane

2. 2,4-dimethyl heptane

3. 2,2,3,3-tetramethyl butane

4. 5-ethyl-2,4-dimethyl octane

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3 years ago