CHEMISTRY COLLEGE

Calculate the entropy change for the gas. (2b)Calculate the entropy change when 14 g of nitrogen expand from a volume of 10 L to a volume of 30 L at the same temperature. Assuming ideal behaviour for the nitrogen gas

Answers

Answer 1

Answer:

Explanation:

because T is const so

deltaS=Q/T=nRLn(V2/V1)

=(14/28)x8.314xLn(30/10)=4,567 J/k

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Answers

Answer:

it's b.

Explanation:

thank u so much for this. i appreciate it. lol.

First one
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A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution? Use the periodic table in the toolbar if needed.

Answers

Answer : The mass of NaOH present in the solution is, 0.0625 grams

Explanation : Given,

Mass % = 25 %

Mass of solution = 0.250 g

Formula used :

$Mass\%=\frac{\text{Mass of}NaOH}{\text{Mass of solution}}* 100$

Now put all the given values in this formula, we get the mass of NaOH.

$25=\frac{\text{Mass of}NaOH}{0.250g}* 100$

$\text{Mass of}NaOH=0.0625g$

Therefore, the mass of NaOH present in the solution is, 0.0625 grams

The concentration of NaOH is 25.00% by mass, it means that 25.00% of the mass of the solution is of NaOH. Hence:

$m_(NaOH)=25.00\%* m_(solution)\Longrightarrow m_(NaOH)=(25)/(100)* 0.250~g\iff\n\n\boxed{m_(NaOH)=0.0625~g}$

After a severe accident, a person can write and talk but has to learn towalk again. What part of the nervous system was probably affected? Explain
why?

Answers

Answer:

Answer is cerebellum. And this is the right answer

Brain, because cerebellum (part of the brain) maintain a person's sense of balance

Select all the true statements. Group of answer choices The +3 oxidation state is characteristic of the actinides. All actinides are radioactive. Cerium (Ce) rnakes 100th in abundance (by mass %). Valence-state electronegativity is when a metal with a positive oxidation state has a greater attraction for the bonded electrons (thus a higher electronegativity) than it does when it has a 0 oxidation state. The actinides are silvery and chemically reactive. The lanthanides are in Period 7.

Answers

In the periodic table,the The +3 oxidation state is characteristic of the actinides. All actinides are radioactive.The actinides are silvery and chemically reactive.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

Learn more about periodic table,here:

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Answer:

The +3 oxidation state is characteristic of the actinides.

All actinides are radioactive.

Cerium (Ce) rnakes 100th in abundance (by mass %).

The actinides are silvery and chemically reactive.

What is the potentual energy of 7 kg object, 12 m off the ground?

Answers

Answer:

823.2 J

Explanation:

PE = mgh

= (7 kg) (9.8 m/s^2) (12 m)

= 823.2 J

Answer:

RequiredAnswer:-

Mass=m=7kg

Height=h=12m

Gravitational force=g=10m/s^2

As we know that

${\boxed{\sf Potential\:energy{}_((P.E))=mgh}}$

Substitute the values

${:}\longmapsto$ $\sf P.E=7×12×10$

${:}\longmapsto$ $\sf P.E=84×10$

${:}\longmapsto$ $\sf Potential\:energy=840Joule$

What volume of 0.335 molar hydrochloricacid solution would be required to neutral-
ize completely 39 mL of 0.137 molar sodium
hydroxide solution?
Answer in units of mL.

Answers

The volume of 0.335 molar hydrochloric acid solution would be required to neutralize completely 39 mL of 0.137 molar sodium hydroxide solution is 15.95mL.

How to calculate volume?

The volume of a substance in a neutralization reaction can be calculated using the following formula;

CaVa = CbVb

Where;

Ca = concentration of acid
Va = volume of acid
Cb = concentration of base
Vb = volume of base

According to this question, 0.335 molar hydrochloric acid solution would be required to neutralize completely 39 mL of 0.137 molar sodium hydroxide solution.

0.335 × Va = 39 × 0.137

0.335Va = 5.343

Va = 15.95mL

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