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3 years ago

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What are stars and galaxy made of?

2 answers:

goldfiish [28.3K]3 years ago

4 0

What are stars made of? Basically, stars are big exploding balls of gas, mostly hydrogen and helium. Our nearest star, the Sun, is so hot that the huge amount of hydrogen is undergoing a constant star-wide nuclear reaction, like in a hydrogen bomb.

In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a "bulge," a "disk" containing "spiral arms," and a "halo." Elliptical galaxies have a "bulge-shape" and a "halo," but do not have a "disk.

Hope it helped

kakasveta [241]3 years ago

3 0

A. Younger stars and gaseous nebulae

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How many moles are in 89 liters of water vapor?

Brut [27]

Answer:

4 moles

Explanation:

A mole is equal to 6.02214076 × 1023 of any chemical unit (atoms, molecules, ions)

To find number of moles in 89 litres of water vapor use the following formula:

1 mole = 22.4 L

That is 1 L = $\frac{1}{24}$ mole

Volume of water vapor = 89 litres

Therefore,

Number of moles in 89 litres = $\frac{89}{24}=3.7$ ≈ 4 moles

5 0

3 years ago

What is the density of an object that has a volume of 66.528 centimeters and a mass of 38.3 grams?

jok3333 [9.3K]

Answer:

<h3>The answer is 0.58 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question we have

$density = \frac{ 38.3}{66.528} \\ = 0.575697450...$

We have the final answer as

<h3>0.58 g/cm³</h3>

Hope this helps you

5 0

3 years ago

How does the process of cell division replace damaged cells?

Tomtit [17]

The cells split up into two to repair the damaged cell so it should be A.

4 0

4 years ago

Read 2 more answers

natural rubidium has the average mass of 85.4678 and is composed of isotopes 85 Rb(mass = 84.9117) and 87 Rb. The ratio of atoms

mote1985 [20]

Answer:

Mass of Rb-87 is 86.913 amu.

Explanation:

Given data:

Average mass of rubidium = 85.4678 amu

Mass of Rb-85 = 84.9117

Ratio of 85Rb/87Rb in natural rubidium = 2.591

Mass of Rb = ?

Solution:

The ration of both isotope is 2.591 to 1. Which means that for 2.591 atoms of Rb-85 there is one Rb-87.

For 100% naturally occurring Rb = 2.591 + 1 = 3.591

% abundance of Rb-85 = 2.591/ 3.591 = 0.722

% abundance of Rb-87 = 1 - 0.722= 0.278

84.9117 × 0.722 + X × 0.278 = 85.4678

61.306 + X × 0.278 = 85.4678

X × 0.278 = 85.4678 - 61.306

X × 0.278 = 24.1618

X = 24.1618 / 0.278

X = 86.913 amu

8 0

3 years ago

Acetylene gas (C2H2) is used in welding torches. When it reacts with oxygen, it produces

Vikki [24]

Mass C₂H₂ needed : 22.165 g

<h3>Further explanation</h3>

Reaction

2C₂H₂+ 5O₂ ⇒ 4CO₂ + 2H₂O

75.0 grams of CO₂ , mol CO₂ (MW=44 g/mol) :

$\tt \dfrac{75}{44}=1.705$

mol C₂H₂ :

$\tt \dfrac{2}{4}\times 1.705=0.8525$

mass C₂H₂ (MW=26 g/mol) :

$\tt 0.8525\times 26=22.165~g$

8 0

3 years ago