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Tcecarenko [31]
3 years ago
15

URGENT! Will give 20 points.

Chemistry
2 answers:
Nataly [62]3 years ago
7 0
Idk why but for some reason the picture isnt ahowing up
Katena32 [7]3 years ago
6 0

Answer:

there is no picture...

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What is the molarity of a solution in which 175.8<br> grams of NaCl is dissolved in 1.5 L of water?
Sophie [7]
175.8 g NaCl to moles:
(175.8 g)/(58.44 g/mol) = 3.008 mol NaCl

Molarity = moles of solute/volume of solution in liters

(3.008 mol NaCl)/(1.5 L) = 2.0 M.

The molarity of this solution would be 2.0 M.
8 0
3 years ago
Match the events related to the formation of the universe with the stages in which they occurred
Ira Lisetskai [31]

Answer : The chronological order events related to the formation of the universe with the stages in which they occurred are given below;

  1. Expansion from an infinitely hot point  - Which is also called as the Planck era from which the big bang theory arrived. It is assumed that from the moment of initial expansion to 10^{-43} seconds afterwards, and many also refer that it was from an infinitely hot point.
  2. Hydrogen fuses into helium  - This was called as the era of Nucleosynthesis which resulted from the Fusion and it continued in the Era of Nucleosynthesis ( which is 0.001 seconds – 3 minutes)
  3. The first neutral atom begins to form - Era of atoms, it began in around 380,000 years – 1 billion years or so.

For better understanding please refer the attachment.

3 0
4 years ago
Key words why a rusty nail is chemical
boyakko [2]
Becuase you can't change it back to the shiny nail that it was at first So so therefore its a chemical and chemicals can not be changed back into its regular state.
4 0
3 years ago
A chemist working for Udensi industries wants to create a new ink for tattoos and cosmetics. Determine the theoretical yield of
leva [86]

Answer:

35.36 g

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

8Fe + S₈ —> 8FeS

Next, we shall determine the mass of Fe that reacted and the mass of FeS produced from the balanced equation. This can be obtained as follow:

Molar mass of Fe = 56 g/mol

Mass of Fe from the balanced equation = 8 × 56 = 448 g

Molar mass of FeS = 56 + 32 = 88 g/mol

Mass of FeS from the balanced equation = 8 × 88 = 704 g

SUMMARY:

From the balanced equation above,

448 g of Fe reacted to produce 704 g of FeS.

Finally, we shall determine the theoretical yield of FeS as follow:

From the balanced equation above,

448 g of Fe reacted to produce 704 g of FeS.

Therefore, 22.5 g of Fe will react to produce = (22.5 × 704)/448 = 35.36 g of FeS.

Thus, the theoretical yield of FeS is 35.36 g

3 0
3 years ago
The formation of nitric oxide (N2(g) + O2(g) Imported Asset 2NO(g)) has a Kc value of 4.7 × 10-31. A classmate claims that this
riadik2000 [5.3K]
Answer is: her reasoning is flawed, because <span>Kc is very small, so the concentration of nitric(II) oxide is also very small. </span>

Balanced chemical reaction: N₂(g) + O₂(g) ⇄<span> 2NO(g).
</span>The equilibrium constant<span> (Kc) is a ratio of the concentration of the products (in this reaction nitrogen(II) oxide) to the concentration of the reactants (in this reaction nitrogen and oxygen):
</span>Kc = [NO]² / [N₂] · [O₂].
Kc = 4.7·10⁻³¹.
If we take equilibrium concentration of oxygen and nitrogen to be 1 M:
[N₂] = [O₂] = 1 M.
[NO] = √[N₂] · [O₂] · Kc.
[NO] = 6.855·10⁻¹⁶ M; equilibrium concentration of nitric oxide.
5 0
4 years ago
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