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2 years ago

8

How many Iron atoms (Fe) are represented in the following formula?

1 answer:

rosijanka [135]2 years ago

8 0

Answer:

5

Explanation:

pa mark brainliest

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Yuki888 [10]

Answer:

1. Carbon dioxide, increase of green house gas

2. Stop deforestation, cut down amount of cars on the road (encourage public to take public transport), reduce the amount of time u on the air-conditioning

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3 years ago

What is the type of potential energy that develops as the object changes shape

Aleonysh [2.5K]

Answer:

The answer is Elastic Potential Energy

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2 years ago

Start with 100.00 mL of 0.10 M acetic acid, CH3COOH. The solution has a pH of 2.87 at 25 oC. a) Calculate the Ka of acetic acid

jasenka [17]

Answer: a) The $K_a$ of acetic acid at $25^0C$ is $1.82\times 10^{-5}$

b) The percent dissociation for the solution is $4.27\times 10^{-3}$

Explanation:

$CH_3COOH\rightarrow CH_3COO^-H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.10 M and $\alpha$ = ?

Also $pH=-log[H^+]$

$2.87=-log[H^+]$

$[H^+]=1.35\times 10^{-3}M$

$[CH_3COO^-]=1.35\times 10^{-3}M$

$[CH_3COOH]=(0.10M-1.35\times 10^{-3}=0.09806M$

Putting in the values we get:

$K_a=\frac{(1.35\times 10^{-3})^2}{(0.09806)}$

$K_a=1.82\times 10^{-5}$

b) $\alpha=\sqrt\frac{K_a}{c}$

$\alpha=\sqrt\frac{1.82\times 10^{-5}}{0.10}$

$\alpha=4.27\times 10^{-5}$

$\% \alpha=4.27\times 10^{-5}\times 100=4.27\times 10^{-3}$

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3 years ago

Compare/Contrast Make a song, poem, journal, story, etc comparing and contrasting metals, nonmetals, and metalloids. Be sure to

likoan [24]

Answer:

here you go

Explanation:

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3 years ago

What is the missing part of the equation below?

Illusion [34]

<span>A. Missing part is ⁴He₂

You can also calculate it by adding/subtracting for atomic mass & atomic numbers

Hope this helps!
</span>

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3 years ago

Read 2 more answers