If the sun ran out of energy what would happen to the energy resources on earth

Answers

Answer 1

Answer: It would be too cold for most man-made energy resources to work correctly.

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Find volume of 1 mole of helium gas when the pressure is 1.46 atm and the temperature is 270k

Answers

we can use the ideal gas law equation to find the volume of He
PV = nRT
where P - pressure 1.46 atm x 101 325 Pa/atm = 147 934.5 Pa
V - volume
n - number of moles - 1 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 270 K
substituting these values in the equation
147 934.5 Pa x V = 1 mol x 8.314 Jmol⁻¹K⁻¹ x 270 K
V = 15.17 L
the volume is 15.17 L

Solve the following problem: (12×10^9)÷(6×10^5)

Answers

First, find the exponents in each parenthesis. 10 to the power of 9 is 1,000,000,000. 10 to the power of 5 is 100,000. 1 billion X 12 is 12 billion. 6 times 100 million is 600 million. Then divide. Cross out the 0s and it'll give you 12,000 divided by 6. Which is 2,000. The answer is 2,000.

the answer should be 2x10^4 why cus you have to divide 12/6 is 2 x 10 and 9-5 is 4 for the exponents. so it goes out like this 2x10^4 . hope I helped of not then iam sorry.

After decaying for 48 hours, l/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

Answers

After the first half-life, 1/2 is unchanged. After the 2nd one, 1/4 remains. After the 4th one, 1/16 remains. So you have 4 half-lives in 48 hours, the half-life is thus 12 hours.

In a laboratory investigation, magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. This reaction is represented by the unbalanced equation below.Mg(s) + HCl(aq) ==>H2(g) + MgCl2(aq)

State, in terms of the relative activity of elements, why this reaction is spontaneous.

Answers

The reaction depicted by the equation would be spontaneous because Mg is higher in reactivity than H.

Reactivity series of cations

The reactivity series of anions is such that: K, Na, Ca, Mg, Al, Zn, Fe, Sn, Pb, and H.

Ions at the higherposition in the reactivity series are able to displace those in lower positions in chemical reactions. Whereas, those in lower positions cannot displace those in higher positions.

Mg is far higher than H in the reactivity series, and thus, will be able to displace Hfrom HCl without any forceful procedure.

More on the reactivity series can be found here:brainly.com/question/14652325

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Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?A....Energy is removed from the particles in each change, but more energy is removed in melting than in boiling because the attractions are weaker.

B....Energy is removed from the particles in each change, but more energy is removed in boiling than in melting because the attractions are weaker.

C....Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.

D....Energy is added to the particles in each change, but melting requires more energy than boiling because the attractions must be completely overcome.

Answers

The correct answer is C. When a solid turns into a liquid the intermolecular forces are just weakens enough to allow the molecules to move around each other. When a liquid turns into a gas the intermolecular forces need to be completely broken since gases ideally do not have any attraction between its particles. It takes a lot more energy to completely brake intermolecular attractions than it does to weaken them.
I hope this helps. Let me know if anything is unclear.

C. Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.

The Haber process can be used to produce ammonia (NH3) from hydrogen gas (H2) and nitrogen gas (N2). The balanced equation for this process is shown below. 3H2 N2 Right arrow. 2NH3 The molar mass of NH3 is 17. 03 g/mol. The molar mass of H2 is 2. 0158 g/mol. In a particular reaction, 0. 575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures? 0. 1 0. 102 0. 10209 0. 1021.

Answers

Answer:

Explanation:

We are given that ammonia can be produced from hydrogen gas and nitrogen gas according to the equation:

$\displaystyle 3\text{H$_2$} + \text{N$_2$} \longrightarrow 2\text{NH$_3$}$

We want to determine the mass of hydrogen gas that must have reacted if 0.575 g of NH₃ was produced.

To do so, we can convert from grams of NH₃ to moles of NH₃, moles of NH₃ to moles of H₂, and moles of H₂ to grams of H₂.

We are given that the molar masses of NH₃ and H₂ are 17.03 g/mol and 2.0158 g/mol, respectively.

From the equation, we can see that two moles of NH₃ is produced from every three moles of H₂.

With the initial value, perform dimensional analysis:

$\displaystyle \begin{aligned} 0.575\text{ g NH$_3$}& \cdot \frac{1\text{ mol NH$_3$}}{17.03\text{ g NH$_3$}} \cdot\frac{3\text{ mol H$_2$}}{2\text{ mol NH$_3$}} \cdot \frac{2.0158\text{ g H$_2$}}{1\text{ mol H$_2$}} \n \n & = 0.102\text{ g H$_2$}\end{aligned}$

*Assuming 100% efficiency.

Our final answer should have three significant figures. (The first term has three, the second term has four (the one is exact), the third term is exact, and the fourth term has five. Hence, the product should have only three.)

In conclusion, our answer is B.

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