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4 years ago

Which of the following is not a source of air pollution related to human activities

Chemistry

2 answers:

tangare [24]4 years ago

8 0

Radon is <span>not a source of air pollution related to human activities</span>

bija089 [108]4 years ago

4 0

Answer: d) radon

Explanation:

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We want to find how much charge is on the electrons in a nickel coin. follow this method. a nickel coin has a mass of about 5 g.

Lady bird [3.3K]

The mass of a nickel coin is 5 g.
1 mol of Ni weighs 58 g. 1 mol contains 6.022 x 10²³ atoms of Ni.
therefore in 58 g there are 6.022 x 10²³ atoms of Ni
then in 5 g the number of Ni atoms are - 6.022 x 10²³ /58 x 5 = 5.2 x 10²² Ni atoms
Therefore number of Ni atoms are 5.2 x 10²² atoms in a nickel coin

3 0

3 years ago

Answer the following questions…

Zina [86]

The concentration of the hydronium ion in hydrochloric acid is 0.0045 M, and the pH of the solution is 2.34.

pH is the potential of the hydrogen or the hydronium ions in the aqueous solution.

As the solution contains $4.5 \times 10^{-3} \;\rm M\;$ HCl the concentration of the hydronium ion will be the same, $4.5 \times 10^{-3} \;\rm M.$

The pH of the solution is calculated as:

$\begin{aligned} \rm pH &= \rm -log[H^{+}]\\\\&= - \rm log (4.5 \times 10^{-3})\\\\&= 2.34\end{aligned}$

The concentration of the hydroxide ion is calculated from pH and hydronium ion as:

$\begin{aligned} \rm [H_{3}O^{+}][OH^{-}] &= 10^{-14}\\\\&= \dfrac{1 \times 10^{-14}}{4.5 \times 10^{-3}}\\\\&= 2.2 \times 10^{12}\end{aligned}$

Now, for the calcium hydroxide solution, the calculations are shown as,

$\begin{aligned} \rm (H_3}\rm O^{+}) &= \rm antilog (-pH)\\\\&= \rm antilog (-8)\\\\&= 10^{-8} \;\rm M\end{aligned}$

pOH is calculated as:

$\begin{aligned} \rm pOH &= 14- 8 = 6\\\\\rm [OH^{-}] &= \rm antilog (-6)\\\\&= 10^{-6} \end{aligned}$

The concentration of calcium hydroxide is calculated as:

$\begin{aligned} &= \dfrac{1}{2} \times \rm [OH^{-}]\\\\&= 5 \times 10^{-4} \;\rm M\end{aligned}$

Therefore, the pH and the pOH give the concentration of the hydrogen or the hydronium ion and the hydroxide ion.

Learn more about pH and pOH here:

brainly.com/question/16062632

#SPJ1

3 0

2 years ago

What is the molarity of a 250ml KCl solution made by diluting 175mL of a 3.00 M solution?

Crank

Answer:

2.1 M

Explanation:

The dilution equation is $M_{s} V_{s} = M_{d} V_{d}$ .

$M_{s}$ = the molarity of the sock solution

$V_{s}$ = the volume of the sock solution

$M_{d}$ = the molarity of the diluted solution

$V_{d}$ = the volume of the diluted solution

The stock solution would be what is doing the diluting, so "175 mL of a 3.00 M solution". So $M_{s}$ = 3.00 M. Then: Converting 175 mL to liters: $175 mL * \frac{1 L}{1000mL} = 0.175 L$ (This is $V_{s}$ )

And converting 250 mL KCl to liters: $250 mL * \frac{1 L}{1000mL} = 0.250 L$ (This will be $V_{d}$ )

Then, we plug in our given into the dilution equation, resulting in:

$3.00 M * 0.175 L = M_{d} * 0.250 L$ (divide both sides by 0.250 L, in order to get $M_{d}$ by itself)

$\frac{3.00 M * 0.175 L}{0.250 L} = M_{d}$

$M_{d} = 2.1 M$

So, the molarity of 250 mL KCl made by diluting 175 mL of a 3.0 M solution would be 2.1 M (mol/L).

Hopefully this helped you understand the topic a little bit better. I just finished molarity and dilutions in Chemistry last week. Good luck!

4 0

3 years ago

What is the name of the compound <br>HPO4

xeze [42]

Answer:

wsde4frtghyujkopldfgyhuji

Explanation:

3 0

3 years ago

Read 2 more answers

If you add ice to a glass of room-temperature water, does the water warm the ice or

ikadub [295]

By the First Law of Thermodynamics heat will flow from the hotter body to the cooler one. The water warms the ice and in doing so the water gets colder.

4 0

4 years ago