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2 years ago

What is the fi nal concentration of a 0.6 M NaCl solution if its volume is doubled and the number of moles of solute is tripled?

Chemistry

1 answer:

pshichka [43]2 years ago

4 0

Answer: The final concentration of solution will be 0.9 M.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=\frac{n}{V_s}$

where,

n= moles of solute

$V_s$ = volume of solution in L

Given : molarity = 0.6 i.e. 0.6 moles are present in 1 L of solution.

Given: volume is doubled and moles are tripled

Thus moles = $0.6\times 3=1.8 moles$

volume = $1L\times 2= 2L$

$Molarity=\frac{1.8moles}{2L}=0.9M$

Therefore, the final concentration of solution will be 0.9 M.

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In the electrochemical cell using the redox reaction below, the anode half reaction is ________. Sn4+ (aq) + Fe (s) → Sn2+ (aq)

kenny6666 [7]

Answer:

The anode half reaction is : $Fe(s)\rightarrow Fe^{2+}(aq.)+2e^{-}$

Explanation:

In electrochemical cell, oxidation occurs in anode and reduction occurs in cathode.

In oxidation, electrons are being released by a species. In reduction, electrons are being consumed by a species.

We can split the given cell reaction into two half-cell reaction such as-

Oxidation (anode): $Fe(s)\rightarrow Fe^{2+}(aq.)+2e^{-}$

Reduction (cathode): $Sn^{4+}(aq.)+2e^{-}\rightarrow Sn^{2+}(aq.)$

------------------------------------------------------------------------------------------------------------

overall: $Fe(s)+Sn^{4+}(aq.)\rightarrow Fe^{2+}(aq.)+Sn^{2+}(aq.)$

So the anode half reaction is : $Fe(s)\rightarrow Fe^{2+}(aq.)+2e^{-}$

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2 years ago

The mechanism for the reaction described by 2N2O5(g) ---> 4NO2(g) + O2(g) is suggested to be (1) N2O5(g) (k1)--->(K-1) NO2

aliina [53]

Go add me on Snapchat christian3cruz

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2 years ago

According to the equation below, how many moles of Ca(OH)2 are required to react with 1.36 mol H3PO4 to produce Ca3(PO4)2? 3Ca(O

allsm [11]

Answer: The amount of calcium hydroxide needed to react is 2.04 moles

Explanation:

We are given:

Moles of phosphoric acid = 1.36 moles

For the given chemical equation:

$3Ca(OH)_2+2H_3PO_4\rightarrow Ca_3(PO_4)_2+6H_2O$

By Stoichiometry of the reaction:

2 moles of phosphoric acid reacts with 3 moles of calcium hydroxide

So, 1.36 moles of phosphoric acid will react with = $\frac{3}{2}\times 1.36=2.04mol$ of calcium hydroxide

Hence, the amount of calcium hydroxide needed to react is 2.04 moles

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2 years ago

Which of the following shows an accurate combustion reaction?

Jet001 [13]

Answer:

Cu + O₂ → CuO₂

Explanation:

A combustion reaction is the reaction with oxygen along with the release of energy in form of heat or light.

Organic compounds (like CH₄) undergo combustion forming water and CO₂.

The combustion reaction of CH₄ is:

CH₄ + 2O₂ → CO₂ + 2H₂O

Hence, the first equation from the choices is not showing the combustion reaction of CH₄.

Not only organic compounds can undergo combustion. Metals and no metals can undergo combustion, i.e. metals and no metals can react with oxygen releasing light or heat.

The reaction of copper and oxygen (second choice) is a combustion reaction:

Cu + O₂ → CuO₂

The formation of water (2H₂ + O₂ → 2H₂O) is other example of a combustion reaction where no organic compounds are involved.

On the other hand, the other two equations from the choice list are not reactions with oxygen, so they do not show combustion reactions.

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2 years ago

Give four different chemical meanings for the word element and an example of each

Naddika [18.5K]

Answer ;

-An element is a substance containing only one type of atom, for example; H2 or 02 (consisting of atoms that all have the same number of protons).

-Microscopic, single atom of that element

-Macroscopic, sample of that element large enough to weigh on a balance

- A substance that cannot be broken down chemically; e.g; sodium metal,

Explanation;

-An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.

-An element is uniquely determined by the number of protons in the nuclei of its atoms.

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2 years ago