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3 years ago

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The Big Bang really happened. But within milliseconds, the universe expanded or inflated so rapidly that the universe is flat an

d uniform

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telo118 [61]3 years ago

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The combustion of 1 mol ch4 releases 803 kj of energy. how much energy is produced from the combustion of 5.00 mol ch4.

Annette [7]

Answer : The energy produced from the combustion of 5 mole $CH_4$ is $4015KJ$

Solution : Given,

Released energy = 803 KJ

The balanced combustion reaction is,

$CH_4+2O_2\rightarrow CO_2+2H_2O$

As per the question,

1 mole of $CH_4$ releases energy = 803 KJ

5 mole of $CH_4$ produced energy = $\frac{5mole}{1mole}\times 803KJ=4015KJ$

Therefore, the energy produced from the combustion of 5 mole $CH_4$ is $4015KJ$

7 0

4 years ago

..........................

labwork [276]

Mixtures can be physically separated but compounds must be chemically separated.

PLS MARK ME AS THE BRAINLIEST

4 0

4 years ago

what is the molarity of an HCI solution if 25.0 ml of 0.185 M NaOH is required to neutralize 0.0200 L of HCI?

tekilochka [14]

Answer:

0.231 M.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

HCl + NaOH —> NaCl + H2O

From the balanced equation above, we obtained the following data:

Mole ratio of the acid, HCl (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

Next, the data obtained from the question:

Volume of base, NaOH (Vb) = 25 mL

Molarity of base, NaOH (Mb) = 0.185 M

Volume of acid, HCl (Va) = 0.0200 L

Molarity of acid, HCl (Ma) =?

Next, we shall convert 0.0200 L to mL

This can be obtained as follow:

1 L = 1000 mL

Therefore,

0.0200 L = 0.0200 L × 1000 mL /1 L

0.0200 L = 20 mL

Thus, 0.0200 L is equivalent to 20 mL.

Finally, we shall determine the molarity of the acid solution as follow:

Mole ratio of the acid, HCl (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

Volume of base, NaOH (Vb) = 25 mL

Molarity of base, NaOH (Mb) = 0.185 M

Volume of acid, HCl (Va) = 20 mL

Molarity of acid, HCl (Ma) =?

MaVa / MbVb = nA/nB

Ma × 20 / 0.185 × 25 = 1

Ma × 20 / 4.625 = 1

Cross multiply

Ma × 20 = 4.625 × 1

Ma × 20 = 4.625

Divide both side by 20

Ma = 4.625 / 20

Ma = 0.231 M

Thus, the molarity of the acid solution is 0.231 M.

3 0

3 years ago

Describe the temperature changes that occur in ice as energy is added, starting in the frozen state and ending in the vapor stat

Ket [755]

Explanation:

When water is frozen then it is known as ice and its state is solid. So, its molecules will be held closer to each other as they are held by strong intermolecular forces of attraction.

As a result, its temperature will be minimum as its molecules have least kinetic energy.

It is known that kinetic energy of a substance is directly proportional to temperature.

As, K.E = $\frac{3}{2}kT$

where K.E = kinetic energy

T = temperature

k = boltzmann constant

When solid changes into liquid state then it means molecules of a substance has gained kinetic energy due to which there occurs more collisions between the molecules.

Hence, temperature of substance also increases.

Whereas when liquid state of a substance changes intro vapor state then it means that more kinetic energy has gained by the molecules due to which there will be much more collisions between the molecules.

Hence, temperature will be maximum in vapor state.

8 0

3 years ago

What is the difference between a scientific thenry and a scientific law?

ryzh [129]

Answer:

Scientific theories are still to be proven while as scientific laws are already proven.

4 0

3 years ago