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3 years ago

Why does Earth get more energy from the sun than from all the other stars in the universe combined?

Chemistry

1 answer:

julia-pushkina [17]3 years ago

8 0

Answer:

Explanation:

C is correct because it is extremely close compared to other stars, the closest at 23 light-years(the distance from the Earth to the sun) away.

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Enter your answer in the box provided. How many grams of helium must be added to a balloon containing 6.24 g helium gas to doubl

Archy [21]

Answer : The mass of helium gas added must be 12.48 grams.

Explanation : Given,

Mass of helium (He) gas = 6.24 g

Molar mass of helium = 4 g/mole

First we have to calculate the moles of helium gas.

$\text{Moles of }He=\frac{\text{Mass of }He}{\text{Molar mass of }He}=\frac{6.24g}{4g/mole}=1.56moles$

Now we have to calculate the moles of helium gas at doubled volume.

According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,

$V\propto n$

or,

$\frac{V_1}{V_2}=\frac{n_1}{n_2}$

where,

$V_1$ = initial volume of gas = V

$V_2$ = final volume of gas = 2V

$n_1$ = initial moles of gas = 1.56 mole

$n_2$ = final moles of gas = ?

Now we put all the given values in this formula, we get

$\frac{V}{2V}=\frac{1.56mole}{n_2}$

$n_2=3.12mole$

Now we have to calculate the mass of helium gas at doubled volume.

$\text{Mass of }He=\text{Moles of }He\times \text{Molar mass of }He$

$\text{Mass of }He=3.12mole\times 4g/mole=12.48g$

Therefore, the mass of helium gas added must be 12.48 grams.

4 0

3 years ago

A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. What is the mass percent of carbon in the compound?

chubhunter [2.5K]

Answer:

mass of carbon = 0.438g

Explanation:

mass percentage = 0.00438%

6 0

3 years ago

What tools do you use to find the volume of an irregular object

arsen [322]

<span>You could find the volume of an irregular object by water displacement. You measure the initial volume of water in a beaker, then you place the object in the water. Record the final volume and subtract it from the initial, and there you have the volume of the object.</span>

3 0

4 years ago

Read 2 more answers

Draw the organic product formed when the following compounds undergo a substitution reaction: (c) ethanoic acid and diethylamine

djyliett [7]

The organic product formed when the ethanoic acid and diethylamine compounds undergo a substitution reaction is N, N- diethyl ethanamide.

<h3>What is Substitution reaction? </h3>

Substitution reaction is a reaction in which one group substitute the functional group of another organic compound or it can also be defined as a reaction that involves the replacement of one atom or group of atoms of a compound with another atom or group of atom.

<h3>Types of Substitution reaction</h3>

Substitution Reactions are basically of two types:

nucleophilic reaction and electrophilic reactions. These two types of substitution reactions differ in the types of atom that is attached to its original molecule. In the nucleophilic reactions, the atom is electron-rich species, on the other hand, in the electrophilic reaction, the atom is an electron-deficient species.

Thus, we concluded that the organic product formed when the ethanoic acid and diethylamine compounds undergo a substitution reaction is N, N- diethyl ethanamide.

learn more about substitution reaction:

brainly.com/question/10143438

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