pls help i will mark as brainliest​

Answer:

Explain:- 22.4L Imol Page 10 Many gas law problems involve calculating the volume of a gas produced by the reaction of volumes of other gases. The problem solving strategy that we have used throughout your chemistry course is still the same. 10.

The volume would 9.23 moles of oxygen gas occupy at 825 mmHg and 45 C 22.4L.

According to the Ideal Gas Law, all gases contain the same number of molecules at the same temperature, pressure, and volume (but not the same mass).

When the temperature and pressure are close to the point of transforming into a liquid or solid, the Ideal Gas law does not apply.

There are four governing assumptions for a gas to be "ideal": The volume of the gas particles is insignificant. The gas particles are all the same size and have no intermolecular forces with one another. According to Newton's Laws of Motion, the gas particles move at random.

Given :

Volume = ?

Number of moles = 9.23 moles

Temperature = 318K

Pressure = 825 mmHg = 1.08 atm

By an ideal gas equation

PV = nRT

V = nRT/ P

= 9.23 × 0.0821 × 318 /  1.08

= 22.4L

Thus, The volume would 9.23 moles of oxygen gas occupy at 825 mmHg and 45 C is 22.4L.

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Answer:

Sea breeze moves from the areas of higher pressure on the water in the direction of the areas of lower pressure on land.

Explanation:

Sea breeze moves from the areas of higher pressure on the water in the direction of the areas of lower pressure on land. Whereas, land breeze blows from the areas of higher pressure on land to the areas of lower pressure on water.

Answer:

burning wood be a chemical change because it wouldn’t be able to go back to its original form. A physical change would be a broken pencil. The pencil is still a pencil, it’s just a physical change.But if it were burned it would be a chemical change.

Explanation:

.Answer:

2kclo3 --> 2kcl + 3o2 is a decomposition reaction because it is breaking apart (thinks decompose- to break apart/down)

H2 + I2 --> 2HI is a synthesis reaction because synthesis is like creation/ building

think DNA synthesis or the book of genesis in the bible about creation

2 Na + 2 H20 --> NaOH + H2 --- not balanced at all

other one is a balanced equation- the Zn + 2HCl one

Explanation:

Li2O

Fe(NO3)3

Al2O3

CuCl2

ZnSO4

All you have to do here is make sure your charges are balanced when you write the compound. For example, Iron (III) has a +3 charge, and nitrate has a -1 charge. You need 3 nitrates to match that charge, hence Fe(NO3)3.

Answer: The molarity of given solution is 0.476 M.

Explanation:

Given : mass of sample (solute) = 7.0 g

Volume of solution (solvent) = 250 mL

Convert mL into L as follows.

[tex]1 mL = 0.001 L\\ 250 mL = 250 mL \times \frac{0.001 L}{1 mL}\\= 0.25 L[/tex]

Molar mass of NaCl is 58.44 g/mol. Hence, moles of NaCl are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{7.00 g}{58.44 g/mol}\\= 0.119 mol[/tex]

Molarity is the number of moles of a substance present in one liter of solution or solvent.

So, molarity of given solution is calculated as follows.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.119 mol}{0.25 L}\\= 0.476 M[/tex]

Thus, we can conclude that molarity of given solution is 0.476 M.

Answer:

1.4 M

Explanation:

n(HBr)=3.115/81

so, 3.115/81=0.0385mol

according to the reaction, n(HBr)=n(KOH)=0.038 mol

C(KOH)=n/V=0.0385/0.02745

0.0385/0.02745 =1.4 M

in short the answer is 1.4 M (molarity)

Answer:

Magnetic susceptibility is the degree to which a material can be magnetized in an external magnetic field. If the ratio between the induced magnetization and the inducing field is expressed per unit volume, volume susceptibility (k) is defined as.

Explanation:

good luck

Calculation: Molar mass of water = 180 % of water = > 180/286*100 = > 62.93%.

Answer: the percent by mass of water in the hydrate Na2CO3.10H20 is 62.93%.

Answer:

b

Explanation:

reverse the first reaction

multiply the second by 5

multiply the third by 3

3244.8-1967.5-1450.5=-173.2

Answer:

think I did this before and its V

Answer: Its acceleration is -5 meters/second2.

Explanation:

Answer: The final pressure is 116kPa or [tex]116kN/m^2[/tex]

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = [tex]250kN/m^2=250kPa[/tex]   [tex](1kN/m^2=1kPa)[/tex]

[tex]P_2[/tex] = final pressure of gas = ?

[tex]V_1[/tex] = initial volume of gas = v ml

[tex]V_2[/tex] = final volume of gas = [tex]1.8\times v=1.8vml[/tex]

[tex]T_1[/tex] = initial temperature of gas = [tex]75^0C=(75+273)K=348K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]18^0C=(18+273)K=291K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{250kPa\times v}{348}=\frac{P_2\times 1.8v}{291}[/tex]

[tex]P_2=116kPa[/tex]

The final pressure is 116kPa or [tex]116kN/m^2[/tex]

Answer: The final pressure is 1600 torr.

Explanation:

To calculate the final pressure of the system, we use the equation given by Gay Lussac' Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.

Mathematically,

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

where,

[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.

[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.

We are given:

[tex]P_1=800.0torr\\T_1=27^oC=(27+273)K=300K\\P_2=?\\T_2=327^0C=(327+273)K=600K[/tex]

Putting values in above equation, we get:

[tex]\frac{800.0torr}{300K}=\frac{P_2}{600K}\\\\P_2=1600torr[/tex]

Thus the final pressure is 1600 torr.

Explanation:

c . produces bile is not the function of slaiva

Answer:

B. partially digests starch

Answer: The rate increases 3 times on raising the temperature from 20degree to 30 degree​

Explanation:

According to Arrhenius equation with change in temperature, the formula is as follows.

[tex]ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}][/tex]

where [tex]k_2[/tex] = rate constant at temp [tex]T_2[/tex]

[tex]k_1[/tex] = rate constant at temp [tex]T_1[/tex]

[tex]E_a[/tex]= activation energy

R= gas constant

[tex]T_1[/tex]= temperature = [tex]20^0C=(20+273)K=293K[/tex]

[tex]T_2[/tex]= temperature = [tex]30^0C=(30+273)K=303K[/tex]

[tex]ln \frac{k_{2}}{k_{1}} = \frac{-85\times 1000J/mol}{8.314J/Kmol}[\frac{1}{303} - \frac{1}{293}][/tex]

[tex]ln \frac{k_{2}}{k_{1}}=1.15[/tex]

[tex]\frac{k_{2}}{k_{1}}=3[/tex]

Thus rate increases 3 times on raising the temperature from 20degree to 30 degree​

Answer:

? more info

Explanation:

Give users an example of the reactions you've learned about so we can have more of an idea. I'd be glad to help, if you edited your answer, meanwhile I too have homework in need of finishing.

Answer:

hydrophobic: tending to repel or fail to mix with water.

hydrophylic​: having a tendency to mix with, dissolve in, or be wetted by water.

Hope it helps!!!

Answer:

B. People live longer than they used to

Explanation:

None of the other answers are correct.

Answer:

6.321 × 10^22

Explanation:

Mass of Oxygen =

3.36

g

Molar mass of oxygen (

O

2

) = 16 x 2 =

32

g

m

o

l

−

Total molecules in oxygen = Mass in grams/Molar mass x

N

A

=

3.36

32

x

6.02

x

10

23

=

6.321

x

10

22

Note:

N

A

(Avagadro's number) =

6.02

x

10

23

Hope it helps...

Explanation:

This is cause of b) Static Electricity

It is also called Electrostatic force combined together.

Hope it helps ya :)

Answer:

0.9moles of Zn are produced

Explanation:

Based on the reaction:

ZnO + 2Na → Na2O + Zn

1 mole of ZnO reacts with 2 moles of Na to produce 1 mole of Na2O and 1 mole of Zn

For 2 moles of sodium present, 1 mole of Zn is produced (The conversion factor is 2mol Na = 1mol Zn

If 1.8 moles of sodium are present:

1.8mol Na * (1mol Zn / 2mol Na) =

Answer:

A. Find a connection between variables

Explanation:

In the scientific method, the first step is to make an observation. To observe means to carefully monitor phenomena with a view to draw general patterns from specific occurrences.

The second step is to draw up a hypothesis; this is a tentative explanation for the observation.

The next step is to perform an experiment to determine the effect of change in one more variables on another variable. The experiment will confirm or disprove the hypothesis.

The last step is to draw a conclusion. In drawing up a conclusion, a scientist finally establishes the relationship between two variables and finds the connection between them.

Answer:

3Sn + 4HNO3 + H2O → 3H2SnO3 + 4NO

Answer:

A -  Nitrile compound

B-   AlkylAmine

C-   Alcohol

D -  Alkene

Explanation:

(A) undergoes reduction to form alkylamine.

(B) is a primary alkyl amine which on carbylamine test gives a foul smell.

(B) reacts with NaNO2 + HCl undergoes diasotisation following which alcohol is produced.

(C) being a alcohol undergoes hydrolysis to give alkene.

(D) On further reaction with H2S04 by the rule of Markownikoff rule it forms a isomer of (C).

The empirical formula for dioxin (C₁₂H₄Cl₄O₂) is (C₆H₂Cl₂O).

We can determine the components of a chemical compound by looking at its formula. We can determine the precise number of atoms in a compound's molecule using its molecular formula. The ratio of these components is provided by the empirical formula. It is the compound's molecular formula scaled down to its lowest integer ratio.

Empirical formula for dioxin (C₁₂H₄Cl₄O₂) is (C₆H₂Cl₂O).

To determine the emperical formula:

Step1: Determine the masses.

Step 2: Multiply the grams by the atomic mass to get the number of moles.

Step 3: Subtract the least number of moles from the total number of moles of each element.

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Answer:The electron-domain geometry around this central atom is  linear

Explanation:

The hybridization is sp which means the number of electron pairs involved are 2. The electron domain geometry will have two sigma bonds and thus geometry will be linear.

The electron domain geometry will be Trigonal bipyramidal when hybridization is [tex]sp^3d[/tex]

The electron domain geometry will be octahedral when hybridization is [tex]sp^3d^2[/tex]

The electron domain geometry will be Trigonal planar when hybridization is [tex]sp^2[/tex]

The electron domain geometry will be tetrahedral when hybridization is [tex]sp^3[/tex]