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3 years ago

One of the reasons that stars are so large is because _____.

Chemistry

2 answers:

nadezda [96]3 years ago

8 0

Answer:

Best answer a.) pressure builds to heat the gases

Explanation:

A star is made up a massive ball of hot gas, large enough that gravity causes it to implode on itself forming a very dense and hot core that then causes nuclear fusion, whereby larger atoms are formed from the combination of much smaller ones, in the process a lot of heat and pressure is generated that then in turn pushes outwards from the core making it larger.

ValentinkaMS [17]3 years ago

4 0

Answer:

They are composed of hydrogen and helium

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200.0 mL of 3.85 M HCl is added to 100.0 mL of 4.6 M barium hydroxide. The reaction goes to completion. What is the concentratio

Ede4ka [16]

Answer:

2.387 mol/L

Explanation:

The reaction that takes place is:

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

First we calculate how many moles of each reagent were added:

HCl ⇒ 200.0 mL * 3.85 M = 203.85 mmol HCl

Ba(OH)₂ ⇒ 100.0 mL * 4.6 M = 460 mmol Ba(OH)₂

460 mmol of Ba(OH)₂ would react completely with (2*460) 920 mmol of HCl. There are not as many mmoles of HCl so Ba(OH)₂ will remain in excess.

Now we calculate how many moles of Ba(OH)₂ reacted, by converting the total number of HCl moles to Ba(OH)₂ moles:

203.85 mmol HCl * $\frac{1mmolBa(OH)_{2}}{2mmolHCl}$ = 101.925 mmol Ba(OH)₂

This means the remaining Ba(OH)₂ is:

460 mmol - 101.925 mmol = 358.075 mmoles Ba(OH)₂

There are two OH⁻ moles per Ba(OH)₂ mol:

OH⁻ moles = 2 * 358.075 = 716.15 mmol OH⁻

Finally we divide the number of OH⁻ moles by the total volume (100 mL + 200 mL):

716.15 mmol OH⁻ / 300.0 mL = 2.387 M

So the answer is 2.387 mol/L

7 0

3 years ago

Can you quess my Hogwarts house? Please explain why you think that and I will give brainliest

vladimir1956 [14]

Answer:

I prob can bc I'm a bad b*tch

lol

8 0

3 years ago

Among timber, wind, and oil, which is a fossil fuel and which is not?

Cloud [144]

Answer:

Oil is a fossil fuel and timber or wood and wind is not. Hope this helps!

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2 years ago

Read 2 more answers

1Which is a dopant for a p-type semiconductor?

aalyn [17]

For a p type of semiconductor we need a dopant which is from 13th group in periodic table

Al , B, Ga, In Tl

So the correct element will be In : Indium

The other elements belongs to 15th group and hence will give n type semiconductor

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3 years ago

Read 2 more answers

What is the effect of adding heat to a gas at constant pressure?

Anna007 [38]

The pressure will continue to build up eventually causing a release of pressure or an explosion.

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3 years ago