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qaws [65]
3 years ago
10

The large mass extinction in Earths history occurred at the end of which area?

Chemistry
1 answer:
myrzilka [38]3 years ago
6 0
<span>Permian-Triassic was one of the biggest mass extinction on Earth.</span>
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Uranium and ________ are needed to run a nuclear reactor.
Ede4ka [16]
Water.  The energy from the fission reaction is used to heat water.  The water vaporizes which causes pressure rise.  The pressure is used to drive a turbine which runs a generator.
I hope this helps.
7 0
4 years ago
What is the percent of hydrogen by mass in HNO3? (Molar<br> mass of HNO3 = 630 g/mol)
xxMikexx [17]

Answer:

63.01284 g/mol

Explanation:

This compound is also known as Nitric Acid.

Convert grams HNO3 to moles or moles HNO3 to grams

Molecular weight calculation:

1.00794 + 14.0067 + 15.9994*3

Percent composition by element

Element Symbol Atomic Mass # of Atoms Mass Percent

Hydrogen H 1.00794 1 1.600%

Nitrogen N 14.0067 1 22.228%

Oxygen O 15.9994 3 76.172%

6 0
3 years ago
Solution A is 100 times as acidic as solution B. What is the difference in pH values of solution A and solution B
devlian [24]

Answer:

The difference is 2 pH units.

Explanation:

Let's give an arbitrary value to the H⁺ concentration of solution A, [H⁺]ₐ:

  • [H⁺]ₐ = 0.001 M

If that's the case then the pH of solution A would be:

  • pHₐ = -log(0.001) = 3

----

The H⁺ concentration of solution B ( [H⁺]ₓ ) is 100 higher than that, so:

  • [H⁺]ₓ = 0.001 * 100 = 0.1 M

And its pH:

  • pHₓ = -log(0.1) = 1

So the difference in pH values is:

  • pHₐ - pHₓ = 3 - 1 = 2
3 0
3 years ago
A sample of argon gas has a volume of 698.7l. The temp is decreased to 24.8c and the volume also decreases to 499.1l. What was t
Rina8888 [55]
ASsfh 977. Hoon mein
4 0
3 years ago
If you had 10.00 mL of acetic acid that you titrated with .100 M NaOH, and you used 45.15 mL of that base to get a light pink co
3241004551 [841]

Answer:

0.4515 M

Explanation:

In case of titration , the following formula can be used -

M₁V₁ = M₂V₂

where ,

M₁ = concentration of acid ,

V₁ = volume of acid ,

M₂ = concentration of base,

V₂ = volume of base .

from , the question ,

M₁ = ? M

V₁ = 10.0 mL

M₂ = 0.100 M

V₂ = 45.15 mL

Using the above formula , the molarity of acid , can be calculated as ,

M₁V₁ = M₂V₂

M₁ * 10.0mL = 0.100 M  * 45.15 mL  

M₁ = 0.4515 M

Hence, the concentration of the acetic acid = 0.4515 M

4 0
3 years ago
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