2 years ago

Help please What percentage of the world does not have a reliable source for clean water?

Chemistry

1 answer:

disa [49]2 years ago

7 0

Answer:9%

Explanation:

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Even when an object appears to be at rest, its atoms and molecules are in constant motion

natita [175]

Answer:

the answer is True

Explanation:

the answer is True

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2 years ago

Which functional group will cause a compound to have a boiling point greater than that predicted only by molar mass?

Mekhanik [1.2K]

Answer: Alcohol

Explanation:

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2 years ago

How is motion involved in your lives?

PolarNik [594]

Answer:

By walking and stuff, duh.

Explanation:

We walk, motion.

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3 years ago

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Calculate the standard free-energy change at 25 ∘C for the following reaction:

lianna [129]

Answer:

Standard free-energy change at $25^{0}\textrm{C}$ is $-3.80\times 10^{2}kJ/mol$

Explanation:

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

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

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

Overall: $Mg(s)+Fe^{2+}(aq.)\rightarrow Mg^{2+}(aq.)+Fe(s)$

Standard cell potential, $E_{cell}^{0}=E_{Fe^{2+}\mid Fe}^{0}-E_{Mg^{2+}\mid Mg}^{0}$

So, $E_{cell}^{0}=(-0.41V)-(-2.38V)=1.97V$

We know, standard free energy change at $25^{0}\textrm{C}$ ( $\Delta G^{0}$ ): $\Delta G^{0}=-nFE_{cell}^{0}$

where, n is number of electron exchanged during cell reaction, 1F equal to 96500 C/mol

Here n = 2

So, $\Delta G^{0}=-(2)\times (96500C/mol)\times (1.97V)=-380210J/mol=-380.21kJ/mol=-3.80\times 10^{2}kJ/mol$

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lianna [129]

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3 years ago

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