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3 years ago

The reaction P4 +502P4010 + 712 kcal is

Chemistry

2 answers:

dem82 [27]3 years ago

8 0

Answer:

4) exothermic

Explanation:

$P_4+5O_2>P_4 O_{10}+712 kcal$

$2NO_2 (g)N_2 O_4(g)\\\\\Delta H=-58 KJ per mol$

If the reaction has negative ∆H value then the reaction is exothermic

$N_2 O_4 (g)2NO_2 (g)\\\\\Delta H=+58 KJ per mol$

If the reaction has positive ∆H value then the reaction is endothermic

When Heat energy is given in the equation itself

If it is present on the left side it means that heat is absorbed and the reaction is Endothermic

If it is present on the right side it means heat is given off and the reaction is exothermic

So here we see

$P_4+5O_2>P_4 O_{10}+712 kcal$

Heat energy is present in the equation on the right side so 712 kcal heat is released and the reaction is EXOTHERMIC

igor_vitrenko [27]3 years ago

4 0

Answer:

The reaction is exothermic (option 4)

Explanation:

P4 + 5O2 → P4O10 + 712 kcal

In chemical reactions heat can be absorbed or released:

⇒in the first case, when heat is absorbed, this is called an endothermic reaction. The products have more energy than the reactants. The reaction requires or absorbs energy from it's surroundings. That means that in this reaction energy , in the form of heat, will be absorbed by the reactants.

⇒ when heat is released, this is called an exothermic reaction. The reactants have more energy than the products. The reaction gives or releases energy to it's surroundings. That means that in this reaction energy , in the form of heat, will be released by the reactants.

in the case of P4 + 5O2 → P4O10 + 712 kcal

We notice that on the right side, which is the product side, there is a positive amount of energy. This means that the energy is released by the the reactants, in this reaction. The reaction is exothermic.

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Write the symbol for nitrogen which has 9 neutrons How do I solve this?

diamong [38]

If you mean lewis dot symbol you need a nuclide you get the number of proton (z) its equal to electrons since the atom is nutral then you make the elctron configuraion after that you take the number of electrons on the outer energy level( ex:k²L² in this case its the 2 on the L)and if you have 7 electrons and the atom is nitrogen so it becomes
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7 0

3 years ago

Compare Boyle's law, Charles's law, and Avogadro's law. a. What remains constant in each law? b. What are the variables in each

zavuch27 [327]

Answer:

In Boyle's Law, the variable that remains constant is the absolute temperature of the gas.

In Charle's Law, the variable that remains constant is the pressure of the gas.

In Avogadro's Law, the variables that remain constant are pressure and temperature of the gas.

In Boyle's Law, the variables involved are pressure and volume: the law states that for a fixed mass of ideal gas at constant temperature, the pressure of the gas is inversely proportional to the volume:

$p\propto \frac{1}{V}$

where p is the pressure of the gas and V the volume.

In Charle's Law, the variables involved are volume and temperature: the law states that for a fixed mass of ideal gas at constant pressure, the volume of the gas is directly proportional to the temperature:

$V\propto T$

where V is the volume of the gas and T the temperature.

In Avogadro's Law, the variables involved are the volume and the number of moles: the law states that for an ideal gas kept at constant pressure and temperature, the volume of the gas is directly proportional to the number of moles:

$V\propto n$

Where V is the volume of the gas and n the number of moles.

See the graphs of the three Laws in attachment:

- First graph: Boyle's Law, which shows that the pressure of the gas is inversely proportional to the volume

- Second Graph: Charle's Law, which shows that the volume of the gas is directly proportional to the absolute temperature

- Third graph: Avogadro's Law, which shows that the volume of the gas is directly proportional to the number of moles of the gas

Here we want to re-write the three laws by making V the subject.

For Boyle's law, we get:

$V\propto \frac{1}{p}$

For Charle's Law, we get:

$V\propto T$

For Avogadro's Law, we get:

$V\propto n$

Therefore, we see that the two laws that show a direct proportionality are Charle's Law and Avogadro's Law, while Boyle's Law shows an inverse proportionality between the two variables.