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3 years ago

When electrons absorb energy and move to higher energy levels, they are in an____ state.

Chemistry

1 answer:

just olya [345]3 years ago

6 0

<h3> $\color{Green}{Answer}$ </h3><h2> $\color{Blue}{Excited - State}$ </h2>

<h2> $\color{Red}{Mark- Brainliest}$ </h2>

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What minimum mass of iron (II) nitrate must be added to 10.0 of a 0.0699 M phosphate solution in order to completely precipitate

ad-work [718]

<u>Answer:</u> The minimum mass of iron (II) nitrate that must be added is 0.188 grams

<u>Explanation:</u>

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of phosphate solution = 0.0699 M

Volume of solution = 10 mL = 0.010 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$0.0699M=\frac{\text{Moles of phosphate solution}}{0.010L}\\\\\text{Moles of phosphate solution}=(0.0699mol/L\times 0.010L)=6.99\times 10^{-4}mol$

The given chemical equation follows:

$2PO_4^{3-}(aq.)+3Fe(NO_3)_2(aq.)\rightarrow Fe_3(PO_4)_2(s)+6NO_3^-(aq.)$

By Stoichiometry of the reaction:

2 moles of phosphate solution reacts with 3 moles of iron (II) nitrate

So, $6.99\times 10^{-4}mol$ of phosphate solution will react with = $\frac{3}{2}\times 6.99\times 10^{-4}=1.049\times 10^{-3}mol$ of iron (II) nitrate

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of iron (II) nitrate = 180 g/mol

Moles of iron (II) nitrate = $1.049\times 10^{-3}$ moles

Putting values in above equation, we get:

$1.049\times 10^{-3}mol=\frac{\text{Mass of iron (II) nitrate}}{180g/mol}\\\\\text{Mass of iron (II) nitrate}=(1.049\times 10^{-3}mol\times 180g/mol)=0.188g$

Hence, the minimum mass of iron (II) nitrate that must be added is 0.188 grams

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4 years ago

What force of attraction holds ionic compounds together

ivolga24 [154]

Answer:

its a strong nuclear force

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2 years ago

(I’m timed please help) What occurs during a solar eclipse? Check all that apply

Ymorist [56]

Answer:

the moon is between the earth and the sun

Explanation:

☀️ = solar eclipse

5 0

4 years ago

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Is it possible to have more atoms on the product side of a chemical reaction than there are on the reactant side? Explain why or

Mice21 [21]

Answer:

No, you cannot.

Explanation:

Due to the Law of Conservation of Energy all chemical equations have to be balcned. The Law of Conservation of energy states that matter cannot be neither created nor destroyed. By having more atoms on either side, you are breaking this law.

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3 years ago

How many atoms are in 3.5 moles of arsenic atoms?

solmaris [256]

Answer:

2.107×10²⁴

Explanation:

no of moles=no of particles/Avogadro's number

3.5=X/6.02×10²³

by cross multiplication

3.5×6.02×10²³

=2.107 ×10²⁴

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3 years ago

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