The symbol equation for combustion of a hydrocarbon is shown below. What number will go before the oxygen reactant when
this equation is balanced?

The given question is incomplete. The complete question is:

How much heat is produced when 24.8 g of [tex]CH_4[/tex] is burned in excess oxygen gas

Given: [tex]CH _4 +2O_2\rightarrow CO_2+2H_2O[/tex]  ΔH= −802 kJ.

Answer: 1243.1 kJ

Explanation:

Heat of combustion is the amount of heat released on complete combustion of 1 mole of substance.

Given :

Amount of heat released on combustion of  1 mole of methane = 802 kJ kJ/mol

According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

1 mole of [tex]CH_4[/tex] weighs = 16 g  

Thus we can say:  

16 g of [tex]CH_4[/tex] on combustion releases heat = 802 kJ

Thus 24.8 g of [tex]CH_4[/tex] on combustion releases =[tex]\frac{802}{16}\times 24.8=1243.1kJ[/tex]

Thus heat released when 24.8 g of methane is burned in excess oxygen gas is 1243.1 kJ

Answer:

Calories are used for physical activity.

Explanation:

Calories provide energy for consumers. You may notice when you drink or eat, you gain more energy. This is because calories are stored in our drinks and foods.

Answer:

They are

Explanation:

They are used to make people obese. The government uses calories to make people weak and unhealthy. For example, McDonalds is known to have many calories in their food. I hate the government.

Answer:

Neon (Ne)

Explanation:

Nitrogen in it's neutral state has valency of 5 and it's electronic configuration is  given as;

1s2 2s2 2p3

However in isocyanic acid, it forms a covalent bond with hydrogen and carbon. Due to this bond, it is able to achieve stable octet configuration. The configuration is given as;

1s2 2s2 2p6

This is the same electronic configuration as Neon

Answer:

I think it's 3.01 meters per second

To find the speed, you divide distance by time. So, you do 100 divided by 33.2, which equals 3.01 I think. I hope this helped.

Answer:

Cartilage does not contain blood vessels (it is avascular) or nerves (it is aneural). Some fibrocartilage such as the meniscus of the knee does however have blood supply in part. Nutrition is supplied to the chondrocytes by diffusion.

Answer: 5491.72

Explanation:

Answer:

A compound

B mixture

And C Element

Explanation:

Answer:

No you can not divide a primary substance into a seperat one because ot wpuld be like divideing the universe

Answer:

the molar mass of any element can be determined by finding the atomic mass of the element on the periodic table for example, if the atomic mass of sulfer is 32.066 amu, then it's molar mass is 32.066 g / mol

Answer:

13.9

Explanation:

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Answer:

C.)

Explanation:

I also saw this question on Brainly! Hope this helps!

Answer:

Malaria

Explanation:

Mosquitos mainly carry Malaria since the dawn of men.

Answer:

malaria

Explanation:

"Malaria" is a mosquito-borne illness that is caused by a parasitic protist called "Plasmodium protozoa." These parasites are carried by mosquitoes. Once a mosquito bites a human, it creates an opening for the parasites to enter. The parasites then become harmful once they enter the human body. They infect the human's Red Blood Cells (RBCs), which causes several symptoms such as fever, fatigue, headache, cough, nausea, etc.

Answer:

Corosive

Explanation:

CORRECT

Answer:

Corosive

Explanation:

Hope this will help

Answer:

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. Salts are also formed in this reaction.

Explanation:

Answer:

white

Explanation:

A white precipitate of barium sulfate forms if sulfate ions are present. The hydrochloric acid is added first to remove any carbonate ions that might be present - they would also produce a white precipitate, giving a false positive result. Barium nitrate solution can be used instead of barium chloride solution

Answer:

Volume occupied by oxygen gas at 15 degree centigrade​ is equal to [tex]316.5[/tex] centimeter cube

Explanation:

Assuming Pressure is constant.

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

where T1 and T2 are temperature in Kelvin

Substituting the give values we get-

[tex]\frac{300}{273} = \frac{V_2}{288}[/tex]

[tex]V_2 = \frac{288*300}{273} \\V_2 = 316.5[/tex]

Volume occupied by oxygen gas at 15 degree centigrade​ is equal to [tex]316.5[/tex] centimeter cube

Answer:Hlo

Explanation:How are you?

The new pressure : P₂ = 1038.39 mmHg

Given

1.5 L container at STP

Heated to 100 °C

Required

The new pressure

Solution

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure).

So P₁ =  1 atm = 760 mmHg

T₁ = 273 K

T₂ = 100 °C+273 = 373 K

Gay Lussac's Law  

When the volume is not changed, the gas pressure is proportional to its absolute temperature  

[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]

Input the value :

P₂=(P₁.T₂)/T₁

P₂=(760 x 373)/273

P₂ = 1038.39 mmHg