All categories

3 years ago

Red giant stars defination

2 answers:

8 0

A red giant star is a dying star in the last stages of stellar evolution. In only a few billion years, our own sun will turn into a red giant star, expand and engulf the inner planets, possibly even Earth

kramer3 years ago

6 0

Answer:

A red giant is a luminous giant star of low or intermediate mass in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around 5,000 K or lower.

You might be interested in

Ethylene glycol is used as an antifreeze in car. if 400 g of ethylene glycol is added to 4.00 kg of water, what is the molaity?

Illusion [34]

Data:

solute: ethylene glicol => not ionization

molar mass of ethylene glicol (from internet) = 62.07 g/mol

solute = 400 g

solvent = water = 4.00 kg

m =?

ΔTf = ?

Kf = 1.86 °C/mol

Formulas:

m: number of moles of solute / kg of solvent

ΔTf = Kf*m

number of moles of solute = mass in grams / molar mass

Solution

number of moles of solute = 400 g / 62.07 g/mol = 6.44 moles

m = 6.44 mol / 4 kg = 1.61 m <-------- molality (answer)

ΔTf = 1.86 °C / m * 1.61 m = 2.99 °C <---- lowering if freezing point (answer)

8 0

3 years ago

The force of gravity

Anon25 [30]

Explanation:

D No cap tell me if dis helped <3

3 0

3 years ago

Give the coefficient of y in the following expression. 2xz² - 7xy + 4.

ArbitrLikvidat [17]

Answer:

the coefficient of y is -7

3 0

3 years ago

How do the valence electrons of carbon cause its chemical behavior

Crank

It's not the valences electrons themselves, but the number of valence electrons that determines the chemical properties of an element

3 0

3 years ago

How many dm3 of hydrogen are released when 3 g of potassium is reacted with hydroiodic acid?

nlexa [21]

Answer:

V = 0.0859dm³

Explanation:

Hydroiodic acid, HI, reacts with potassium, K, to produce potassium iodide, KI, and hydrogen, as follows:

2HI + 2K → 2KI + H₂(g)

To solve this question we have to find the moles of hydrogen produced knowing that 2 moles of K produce 1 mole of H₂. With the moles of hydrogen we can find the volume of hydrogen assuming there are STP conditions:

Moles K -Molar mass: 39.0983g/mol-

3g * (1mol / 39.0983g) = 0.0767 moles of K

Moles H₂:

0.0767 moles of K * (1mol H₂ / 2mol K) = 0.03836 moles H₂

Using: PV = nRT; V = nRT / P

Where V is volume in dm³,

n are moles of gas: 0.03836 moles,

R is gas constant = 0.082atm*dm³/molK

T is absolute temperature = 273.15K at STP

and P is pressure = 1atm

The volume of the gas is:

V = 0.03836mol*0.082atm*dm³/molK*273.15K / 1atm

8 0

3 years ago

Red giant stars defination​

Red giant stars defination