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3 years ago

How mant atom arre in this compound: 2H2O

Chemistry

1 answer:

Karolina [17]3 years ago

6 0

Answer:

3 atoms

Explanation:

it contains 2 atoms of hydrogen(H) and 1 atom of oxygen(O). So in total there are 3 atoms.

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A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the samp

nikdorinn [45]

Answer:

2.1x10⁹ years

Explanation:

U-238 is a radioactive substance, which decays in radioactive particles. It means that this substance will lose mass, and will form another compound, the Pb-206.

The time need for a compound loses half of its mass is called half-life, and knowing the initial mass (mi) and the final mass (m) the number of half-lives passed (n) can be found by:

m = mi/2ⁿ

The mass of Pb-206 will be the mass that was lost by U-238, so it will be mi - m. Thus, the mass ration can be expressed as:

(mi-m)/m = 0.337/1

mi - m = 0.337m

mi = 1.337m

Substituing mi in the expression of half-life:

m = 1.337m/2ⁿ

2ⁿ = 1.337m/m

2ⁿ = 1.337

ln(2ⁿ) = ln(1.337)

n*ln(2) = ln(1.337)

n = ln(1.337)/ln2

n = 0.4190

The time passed (t), or the age of the sample, is the half-life time multiplied by n:

t = 4.5x10⁹ * 0.4190

t = 1.88x10⁹ ≅ 2.1x10⁹ years

5 0

3 years ago

Submit a data table you made and a atom diagram. Remember to proofread your work before submitting the work. I will give 30 poin

nadezda [96]

Answer:

There's no picture, so I can't help witht his, apologies!

Explanation:

3 0

3 years ago

A child sits on top of a slide at the park. He pushes forward lightly, but does not go down the slide. Pick the sentence that

Vinvika [58]

Answer:

The net force on the child is zero

4 0

3 years ago

Can someone please help it’s chemistry in biology. it’s an emergency!!!!

yanalaym [24]

Reactants: Potassium and Diboride Trioxide
Products: Potassium Oxide and Boron
Balanced equation: 6 K + 1 B2O3 -> 3 K2O + 2 B

6 0

3 years ago

How many moles of oxygen are needed to make 12 moles of magnesium oxide ?

Artemon [7]

Answer:

6 moles of oxygen are needed to make 12 moles of magnesium oxide.

Explanation:

First of all you should know that the balanced chemical equation is:

2 Mg + O₂ → 2 MgO

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So:

$x=\frac{c*b}{a}$

In this case the rule of three applies as follows: if 2 moles of magnesium oxide are produced from 1 mole of oxygen, 12 moles of magnesium oxide from how many moles of oxygen is produced?

$moles of oxygen=\frac{12 moles of magnesium oxide* 1 mole of oxygen}{2 moles of magnesium oxide}$

moles of oxygen= 6

<u><em>6 moles of oxygen are needed to make 12 moles of magnesium oxide.</em></u>

4 0

4 years ago