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3 years ago

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

2 answers:

6 0

The supergiant stars are considered as the biggest stars in the universe. They can be thousands of times larger than the Sun and can exhibit a mass up to 100 times more. In the case when the supergiants run out of fuel or hydrogen they give rise to a supernova, and then either turn into a black hole or a neutron star.

A neutron star refers to a very dense but little star, comprising neutrons and emerges as the core of the dead supergiant.

A black hole refers to a location in space, more accurately in time-space, which is most generally known for its drastic gravitational influence and for its dark color.

NeTakaya3 years ago

5 0

I believe the correct answer would be "neutron star"

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A gas evolved during the fermentation of sugar was collected. After purification its volume was found to be 25.0 l at 22.5°c and

Ludmilka [50]

Answer:

Moles of gas collected = 0.952 mole

Explanation:

To calculate the number of moles of the gas collected, we use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 702 mmHg

V = Volume of the gas = 25.0 L

T = Temperature of the gas = $22.5^oC=[22.5+273.15]K=295.65\ K$

R = Gas constant = $62.3637\text{ L.mmHg }mol^{-1}K^{-1}$

n = number of moles of gas = ?

Putting values in above equation, we get:

$702\ mmHg\times 25.0\ L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 295.65\ K\\\\n=\frac{702\times 25}{62.3637\times 295.65}\ mol=0.952mol$

<u>Moles of gas collected = 0.952 mole</u>

5 0

3 years ago

What are the groundwater labels?

Sergio [31]

<span>Acetochlor demonstrates characteristics associated with chemicals that have been detected in groundwater. To protect groundwater from contamination, acetochlor product labels restrict the use of acetochlor on porous soils over shallow groundwater:</span>

7 0

3 years ago

Finish this statement: The colder it is the _______________ it is

zloy xaker [14]

"cooler" is your answer

8 0

4 years ago

What is the percent composition by mass for sodium (Na) in sodium phosphate (Na3PO4)? % Na = (______/______)x100% = _______% NNA

ozzi

The percent composition by mass for sodium (Na) in Sodium phosphate (Na₃PO₄) : 42.07%

<h3>Further explanation</h3>

Given

Compound of Sodium phosphate (Na₃PO₄)

Required

The percent composition by mass for sodium (Na)

Solution

<em>The Comparative Law (Proust ) : compounds are formed from elements with the same Mass Comparison</em>

MW Na₃PO₄ = 163,94 g/mol

Ar Na=22,989769g/mol

$\tt \%mass~Na=\dfrac{3.Ar~Na}{MW~Na_3PO_4}\times 100\%\\\\\%mass~Na=\dfrac{3\times 22.99}{163.94}\times 100\%\\\\\%mass~Na=42.07\%~Na$

5 0

3 years ago

Air in a closed cylinder is heated from 25 degree C to 36 degree C. If the initial pressure is 3.80 atm what is the final pressu

Pavlova-9 [17]

Answer: 3.94 atm

Explanation:

Given that,

Initial pressure (P1) = 3.80atm

Initial temperature (T1) = 25°C

since the standard unit of temperature is Kelvin, convert 25°C to Kelvin

(25°C + 273= 298K)

Final pressure P2 = ?

Final temperature T2 = 36°C

(36°C + 273= 309K)

Since pressure and temperature are given while volume is held constant, apply the formula for Pressure's law

P1/T1 = P2/T2

3.80 atm / 298K = P2 / 309K

To get the value of P2, cross multiply

3.80 atm x 309K = P2 x 298K

1174.2 atm•K = 298K•P2

Divide both sides by 298K

1174.2 atm•K/298K = 298K•P2/298K

3.94 atm = P2

Thus, the final pressure is 3.94 atm

5 0

3 years ago

Read 2 more answers