HELP ASAP! I will give brainiest if you answer all questions correctly.

28) Choose the best answer.

Calculate the amount of heat required or released. You will need to use your Periodic Table, Table B-3 and Table B-4, in your Chemistry Reference Guide.

How much heat is required to raise the temperature of 155 g of liquid ammonia (NH3) at 200 K to ammonia gas at 300 K? Ammonia boils at 240 K.

261 kJ
-204kJ
209kJ
-88kJ
300 kJ



29) Choose the best answer.

Calculate the amount of heat required or released. You will need to use your Periodic Table, Table B-3 and Table B-4, in your Chemistry Reference Guide.

How much heat would be needed to raise the temperature of 255 grams of ice at 253 K to steam at 393 K?

-204kJ
300 kJ
209kJ
-88kJ
788 kJ



30) Choose the best answer.

Calculate the amount of heat required or released. You will need to use your Periodic Table, Table B-3, Table B-4, and Table B-5 in your Chemistry Reference Guide.

How much heat is lost when 2012 g of H2O at 400 K is changed into ice at 263 K?

300 kJ
-880 kJ
299 kJ
-204 kJ
-6201 kJ

Answer:

1000

Explanation:

Answer:

Their number

Explanation:

Freezing is the process of decreasing the activity of the molecules in the medium and their arrangement will change to take on the new shape but no new molecules are added or taken away

Answer:

Chlorine has the highest amongst all of those

Answer:

150.08 g

Explanation:

According the law of conservation of mass, mass can neither be created nor destroyed but is converted from one form to another.

As a result of this, the total mass of reactants must be equal to the total mass of products.

If this is so, we have been told that the mass of AgCl is 150.15 g, the total mass of products is 300.23g.

Therefore; mass of NaNO3 = 300.23 g - 150.15 g = 150.08 g

Answer:1

Explanation: friction is showing us how in the past

Answer:

reproduction and life are connected because when you reproduce you are creating life.

Answer:

The Sugar Act (1764),

The Currency Act (1764),

The Quartering Act (1765),

The Stamp Act (1765)

Explanation:

All of these Led to the american Revolution.

Answer:

13.94 atm

Explanation:

From the question given above, the following data were obtained:

Pressure of H₂ = 2 atm

Pressure of NH₃ = 303 KPa

Pressure of CO₂ = 3000 mmHg

Pressure of N₂ = 3800 torr

Total pressure (Pₜ) in atm =?

Next, we shall convert 303 KPa, 3000 mmHg and 3800 torr to atm.

This can be obtained as follow:

Converting 303 KPa to atm

101.325 KPa = 1 atm

Therefore,

303 KPa = 303 KPa × 1 atm / 101.325 KPa

303 KPa = 2.99 atm

Thus, 303 KPa is equivalent to 2.99 atm.

Converting 3000 mmHg to atm

760 mmHg = 1 atm

Therefore,

3000 mmHg = 3000 mmHg × 1 atm / 760 mmHg

3000 mmHg = 3.95 atm

Thus, 3000 mmHg is equivalent to 3.95 atm

Converting 3800 torr to atm

760 torr = 1 atm

Therefore,

3800 torr = 3800 torr × 1 atm / 760 torr

3800 torr = 5 atm

Thus, 3800 torr is equivalent to 5 atm.

Finally, we shall determine the total pressure of the mixture as follow:

Pressure of H₂ (P₁) = 2 atm

Pressure of NH₃ (P₂) = 2.99 atm

Pressure of CO₂ (P₃) = 3.95 atm

Pressure of N₂ (P₄) = 5 atm

Total pressure (Pₜ) in atm =?

Pₜ = P₁ + P₂ + P₃ + P₄

Pₜ = 2 + 2.99 + 3.95 + 5

Pₜ = 13.94 atm

Therefore, the total pressure of the mixture is 13.94 atm

Answer:

Look at the picture below

Explanation:

Answer:

[tex]velocity = \frac{displacement}{time} \\ = \frac{5}{6} \\ velocity = \frac{5}{6} m {s}^{ - 1} [/tex]

Answer:

Potassium nitrate is a chemical compound with the chemical formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−, and is therefore an alkali metal nitrate. It occurs in nature as a mineral, niter (or nitre in the UK). It is a source of nitrogen, and nitrogen was named after niter.

Explanation:

Answer:

2, 19, 12 and 14 are the coefficients.

Answer:1.395x10^27 molecules of O2

Explanation:

2Fe + 3/2O2 —> Fe2O3

for every 2 atoms of Fe, 1.5 molecules of O2 —> 1.395x10^27

Explanation:

Galileo found Venus went through the entire phase cycle, proving that she revolved completely around the Sun, as predicted by Copernicus in his heliocentric model. ... The phases of Venus could not be explained by Ptolemy's Geocentric Model. Galileo knew that the Roman Catholic Church was incorrect.

Answer:

the population of the region

Hope this helps :)

Answer:

C: The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts

Explanation:

Looking at the options, the correct one is Option C because the actual yield usually depends on the conditions of the reaction, while the theoretical yield usually varies with only the amount of reactant.

Answer:

metallic bonding

Explanation:

Copper wire consists of Cu nuclei (that are positively charged due to the positively charged protons) that are surrounded by a "sea" of delocalized electrons (that are negatively charged that move freely throughout the material which is known as metallic bonding.

Answer:

Metallic bonding.

Explanation:

Pure copper is neither covalent nor ironic. It is a bonding called metallic bonding.

Answer:

B,C,F

Explanation:

Answer:

b c f

Explanation:

Answer:

In an exothermic reaction, the products are at a lower energy than the reactants. The difference between the energy of the reactants and the energy of the products is called the enthalpy change (∆H) of the reaction. For an exothermic reaction, the enthalpy change is always negative.

Answer:

Explanation:

The answer is 32°F or 0° Celsius.

Hope it helped you.

Answer:

hello

Explanation:

hi

Answer

There is not as much sunlight underwater and therefore less energy can be absorbed therefore a slower process of photosynthesis.    

Explanation:

Answer:

You're answer is correct. The third answer is correct.

Explanation:

Producers have the most energy, since they gain energy directly from the sun. Their energy is then passed up this upside down pyramid, which the energy is decreased by about 10% each time.

#teamtrees #WAP (Water And Plant)

Answer:

1.1 × 10⁵ J

Explanation:

Step 1: Given data

Step 2: Calculate the change in the temperature

ΔT = 192.4 °C - 70 °C = 122 °C

Step 3: Calculate the heat required (Q)

We will use the following expression.

Q = c × m × ΔT

Q = 0.89 J/g.°C × 1000.0 g × 122 °C

Q = 1.1 × 10⁵ J

Answer: B -2.37 -0.34

Explanation: A P E X

The redox reaction consists of the reduction and the oxidation halves and involves the transfer of electrons. The overall voltage for the Mg and Cu is 0.34 - (-2.37). Thus, option C is correct.

A nonspontaneous redox reaction is the loss and gain of the electrons when an external source of voltage is applied to initiate the electrochemical reaction.

The overall voltage of the redox reaction can be given by the oxidation and the reduction of half of the cell as,

Oxidation half: Mg(s) → Mg₂⁺ + 2e⁻  E° = -2.37 v

Reduction half: Cu₂⁺ + 2e⁻ → Cu(s)  E° = + 0.34 v

The overall voltage of the cell (E° cell) is calculated as,

E° cell = E°(reduction) - E°(oxidation)

= +0.34 - (-2.37)

= 2.71 v

Therefore, option C. 0.34 - (-2.37) is the overall voltage for the nonspontaneous redox reaction.

Learn more about redox reaction here:

https://brainly.com/question/14217644

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Your question is incomplete, but most probably your full question was, What is the overall voltage for a redox reaction with the half-reactions Mg(s) → Mg₂⁺ + 2e⁻ and Cu₂⁺ + 2e⁻ → Cu(s)?

A. -2.37 - 0.34

B. 0.34 - 2.37

C. 0.34 - (-2.37)

D. 2.37 - 0.34

The pH = 2.41

Given

5.0% by mass solution of acetic acid

the density of white  vinegar is 1.007 g/cm3

Required

pH

Solution

Molarity of solution :

[tex]\tt M=\dfrac{\%mass\times \rho\times 10}{MW~acetic~acid}\\\\M=\dfrac{5\times 1.007\times 10}{60}\\\\M=0.839[/tex]

Ka for acetic acid = 1.8 x 10⁻⁵

[H⁺] for weak acid :

[tex]\tt [H^+]=\sqrt{Ka.M}[/tex]

Input the value :

[tex]\tt [H^+]=\sqrt{1.8\times 10^{-5}\times 0.839}\\\\(H^+]=0.00388=3.88\times 10^{-3}\\\\pH=3-log~3.88=2.41[/tex]

White vinegar is a 5.0% by mass solution of acetic acid in water and if the density of white vinegar is 1.007 g/cm³ then the pH of solution is 4.8.

pH of any solution will be calculated as:

pH = - log[H⁺], where

[H⁺] = concentration of H⁺ ions

In this question we will calculate the concentration of H⁺ ions as:

[H⁺] = √Ka.M, where

Ka = acid dissociation constant for acetic acid = 1.8 x 10⁻⁵ (known)

M is molarity and this can be calculated as:

M = (% mass × density × 10) / Molar mass of acid

Given that,

% mass = 5.0% by mass solution of acetic acid

density = 1.007 g/cm³

Molar mass of acetic acid = 60

Now putting all these values on the above equation, we get

M = (5 × 1.007 × 10) / 60 = 0.839

Now, we calculate the concentration of H⁺ ions by putting values on that equation as:

[H⁺] = √(1.8 x 10⁻⁵)(0.839)

[H⁺] = 1.5 x 10⁻⁵

So, pH of the solution will be calculated as:

pH = -log(1.5 x 10⁻⁵)

pH = -(-4.8)

pH = 4.8

Hence, pH is 4.8.

To know more about pH, visit the below link:

https://brainly.com/question/10313314

Answer:

The natural abundance of Re-185 is 40% and of Re-187 is 60%

Explanation:

Relative atomic mass is defined as the sum of the mass of each isotope times its relative abundances.

Is Rhenium has only 2 isotopes and the abundances are X and Y we can write:

X + Y = 1 (1)

And:

185X + 187Y = 186.2 (2)

Where X is abundance of Re-185 and Y abundance of Re-187

Replacing (1) in (2):

185X + 187(1-X) = 186.2

185X + 187-187X = 186.2

-2X = -0.8

X = 0.4 = 40%

And Y = 100% - 40% = 60%

Answer:

C) 301.8

Explanation:

Hello!

In this case, since the solution is composed by water and salt, the total resulting mass comes up from adding the mixed mass of each one:

[tex]m_{sol}=m_{w}+m_{salt}[/tex]

Thus, we plug in to obtain:

[tex]m_{sol}=200.4g+101.42g\\\\m_{sol}=301.8g[/tex]

Therefore, the answer should be C) 301.8 as it has four significant figures.

Best regards!