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3 years ago

In the chemical formula 3NO2 the number 3 is a

Chemistry

1 answer:

Nat2105 [25]3 years ago

8 0

Answer : The number '3' is a moles.

Explanation :

The given chemical formula is, $3NO_2$

As we know that,

For 1 mole of $NO_2$ , there are 1 mole of nitrogen and 2 moles of oxygen.

For 3 mole of $NO_2$ , there are 3 moles of nitrogen and 6 moles of oxygen.

So, from this we conclude that the number '3' present before $NO_2$ represent the number of moles.

Hence, the number '3' is a moles.

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What bonds are broken and octane combustion?

dedylja [7]

Answer:

Common combustion reactions break the bonds of hydrocarbon molecules,

Explanation:

the resulting water and carbon dioxide bonds always release more energy than was used to break the original hydrocarbon bonds. That's why burning materials mainly made up of hydrocarbons produces energy and is exothermic.

7 0

3 years ago

An imaginary planet was just discovered that has a similar environment to our planet Earth. All the chemistry is similar except

Lena [83]

Answer: $\Delta H_{rxn}=-4652$ kJ/mol

Explanation: In a reaction, a bond of a molecule can break or rearrange itself. When it happens, it absorb or release energy.

Bond Energy is the energy necessary to break or to make a particular bond, producing gaseous fragments at atmospheric temperature. This type of energy can be used to show how stable a compound is or how easy a bond can break.

Enthalpy of Reaction is the energy absorption or release at a constant temperature resulting from a chemical reaction.

To calculate the Enthalpy using bond energy, you have:

1) Write the balanced equation with all the all the reactants and products in gaseous form:

$C_{5}H_{12}_{(g)}+8O_{2}_{(g)}$ ⇒ $5CO_{2}_{(g)}+6H_{2}O_{(g)}$

2) Count each bond of each molecule from both sides, including double or triple bonding, if they exists:

Reactants:

$C_{5}H_{12}$ : 12 C-H

4 C-C

O₂ : 1 O=O

Products:

CO₂ : 2 C=O

H₂O : 2 H-O

3) From the balanced reaction, we there are 8 moles of oxygen gas, 5 moles of carbon dioxide and 6 moles of water, which has to be included when adding each side.

$\Sigma H_{reactants}=$ 12.257 + 4.370 + 8.490 = 8484

$\Sigma H_{products}=$ 5.2.740 + 6.2.478 = 13136

4) Calculate Enthalpy of Reaction by:

$\Delta H_{rxn}= \Sigma H_{reactants}-\Sigma H_{products}$

$\Delta H_{rxn}=8484-13136$

$\Delta H_{rxn}=-4652$

The enthalpy of reaction for the combustion of 1 mole of pentane on a just discovered imaginary planet is an exothermic process of magnitude $\Delta H_{rxn}=$ - 4652kJ/mol

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3 years ago

According to Le Chatelier’s principle, what always happens to the equilibrium of a reaction when the temperature is reduced?

Tasya [4]

It always shift to the direction where balance out the reaction
here
It shifts in the exothermic direction.

5 0

3 years ago

Read 2 more answers

What is the molarity when 0.250 moles of nacl is dissolved in water to make a 1.25 l solution?

vovikov84 [41]

Hey There!

number of moles = 0.250 moles NaCl

Volume = 1.25 L

Therefore:

M = n / V

M = 0.250 / 1.25

M = 0.2 mol/L

hope this helps!

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3 years ago

The element that is a transition metal is

slavikrds [6]

There are three noteworthy elements in the transition metals family. These elements are iron,cobalt, and nickel, and they are the only elements known to produce a magnetic field.

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3 years ago