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sukhopar [10]
4 years ago
6

Module 2 dba for chemistry questions? flvs

Chemistry
1 answer:
NeX [460]4 years ago
4 0
Can you translate to english?

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Calculate the percent ionization of nitrous acid in a solution that is 0.230 M in nitrous acid. The acid dissociation constant o
djyliett [7]
Ok first, we have to create a balanced equation for the dissolution of nitrous acid.

HNO2 <-> H(+) + NO2(-)

Next, create an ICE table

           HNO2   <-->  H+        NO2-
[]i        0.230M          0M       0M
Δ[]      -x                   +x         +x
[]f        0.230-x          x           x

Then, using the concentration equation, you get

4.5x10^-4 = [H+][NO2-]/[HNO2]

4.5x10^-4 = x*x / .230 - x

However, because the Ka value for nitrous acid is lower than 10^-3, we can assume the amount it dissociates is negligable, 

assume 0.230-x ≈ 0.230

4.5x10^-4 = x^2/0.230

Then, we solve for x by first multiplying both sides by 0.230 and then taking the square root of both sides.

We get the final concentrations of [H+] and [NO2-] to be x, which equals 0.01M.

Then to find percent dissociation, you do final concentration/initial concentration.

0.01M/0.230M = .0434 or 

≈4.34% dissociation.
8 0
3 years ago
A cube with sides 3cm.Its mass is 54g. will it sink or float
zloy xaker [14]

Answer:

It will sink.

Explanation:

Density of water=1gm/cc (In CGS)

Volume of cube=l^3 =3^3= 27cc

Mass of cube =54gm

Density of cube=M/V =54/27 =2gm/cc

Here, density of cube is greater than that of water. So, the cube sinks.

7 0
3 years ago
Can someone help me with these??
ryzh [129]

Answer: let me see I gotta do the work first then I’ll give you the answers

Explanation:

3 0
3 years ago
In nuclear fission, when the nucleus is hit the atom will ....what?
dimaraw [331]

Answer:

When a large, fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission. The nucleus splits into two or more lighter nuclei, releasing kinetic energy, gamma radiation, and free neutrons.

Explanation:

3 0
3 years ago
Leah suffered from a bacterial infection. White blood cells helped her recover from the infection. Which two organ systems are m
siniylev [52]

WBC's that stands for white blood cells, that are cells of the immune system. It helps to protect the body from various infectious diseases. There are different types of white blood cells in the body like T cells, B cells, monocytes etc.  And is circulated in the body by the circulatory system and thus helps in the recovery from the infection.

Thus, immune and circulatory are two organ systems that are involved in the recovery of the infection.


8 0
4 years ago
Read 2 more answers
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