Please help me with this chemistry

Answer:

its true hope this helped :)

Answer:

The molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.HOW TO CALCULATE MOLARITY:The molarity of a solution can be calculated by dividing the number of moles by its volume. That is;Molarity = no. of moles ÷ volumeAccording to this question, 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide. The molarity is calculated as follows:Molarity = 0.50mol ÷ 2LMolarity = 0.25MTherefore, the molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.Learn more about molarity at: brainly.com/question/2817451

Explanation:

Mark me brainliest please!!! I spent a lot of time on this!!

Answer:

pH = 6.91

Explanation:

Recall that at 25 °C, we have the relationship:

[tex]\displaystyle \text{pH} + \text{pOH} = 14.00[/tex]

Therefore, the pH of a solution with a pOH of 7.09 is:

[tex]\displaystyle \begin{aligned} \text{pH} + (7.09) & = 14.00 \\ \\ \text{pH} & = 6.91 \end{aligned}[/tex]

Answer:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil

Answer: B

Explanation:

At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, and thus the concentrations of the reactants and products must be constant.

Answer:

48 000 cm^2

Explanation:

8000      1cm cubes

 each 1 cm cube side is  1 cm^2   and there are six sides to the cube , so each cube has   6 cm^2  surface area

  and there are  8000 of them     8000 * 6 cm^2 = 48 000 cm^2

The decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

The initial mass of the radioisotope is calculated as follows;

N = N₀(¹/₂)^t/h

where;

24 M/s = N₀(¹/₂)^(22/32)

24 M/s = N₀(0.62)

N₀ = (24 M/s)/(0.62)

N₀ = 38.7 M/s

Thus, the decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

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Answer:

the answer to your question is 1.00784 u

molar mass of H₂S

= 2.Ar H + 1.Ar S

= 2. 1,00784 u + 1. 32,065 u

= 34.08068 u

Answer:

E. None of these

Explanation:

We know, By GAS laws,

PV = NRT, where p- pressure, v- volume, n- number of moles, R- gas constant ,and T- temperature

Now, In the question, the number of moles remains the same as the gas is the same. so n is constant so we can compare n before and after a temperature change.

[tex]\frac{P1V1}{RT1}[/tex] = [tex]\frac{P2V2}{RT2}[/tex]

where P1= 1 atm, P2 = 10 atm, V1= 20 mL, T1= 10°C and T2= 100°C

We don't have to worry about the standard units as they are present equally on both the sides and get cut, same goes for R( gas constant)

So putting values, we get

[tex]\frac{1*20}{R*10} = \frac{10*V2}{R*100}[/tex]

Cutting, R on both sides and moving contents to the right so that only V2 is left on the left.

[tex]\frac{1*20*100}{10*10} = V2[/tex]

∴ V2 = [tex]\frac{2000}{100}[/tex]

∴ V2 = 20mL

Answer:

A Carbon

Explanation:

Answer:

980,536.2 grams

Explanation:

The mass of a compound is equal to its moles times its molar mass.

The molar mass of PCl3 is 137.33 g/mol

137.33 x 7.14 x 10^3 = 980,536.2

Answer:

Chemical Change

Explanation:

A chemical change is when something is turned into a new substances.

In this example the wood is being turned into ash.

Answer:

False.

Explanation:

Humans are made of matter too :)

Answer:

what is on the surface of the moon.

Explanation:

Based on their pOH values, the difference in [OH– ] concentration between point A and point B is 10^6.

The pH is determined by the concentration of Hydrogen ions [H+]. The higher the concentration of H+ ions, the lower the pH of a substance. If the concentration of H+ is greater than OH-, the material is acidic, i.e. the pH value is less than 7

In this case, the formula for this will be:

[tex]pH= -log[H+][/tex]

So we have:

[tex][OH]= 14-1= 10^{-13}\\[OH] = 14-7=10^{-7}[/tex]

Therefore, the difference in [OH– ] concentration between point A and point B is 10^6.

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Answer: 10^6

Explanation: edge2023

1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.

Answer:

Synthesis Reaction

Explanation:

An synthesis reaction is one in which two or more atoms/molecules react to create a different molecule. These reactions follow the general structure: A + B --> AB.

More specifically, this is an addition reaction. An addition reaction occurs when two or more atoms/molecules combine to create a larger molecule. In this case, carbon and fluorine react to form carbon tetrafluoride, a larger molecule consisting of all the reactants.

This is not a decomposition reaction because these reactions involve a molecule breaking down into atoms or simpler molecules. These reactions follow the general structure: AB --> A + B.

This is not a single-replacement reaction because these reactions involve atoms replacing atoms of a different element in a compound. These reactions follow the general structure: A + BX --> B + AX.

Answer:

False

Explanation:

Answer: B

Explanation: I know

Explanation:

[tex]molar \: mass(mg) = 24g. {mol}^{ - 1} mass = 24.3g \\ molar \: mass(h20) = 18g. {mol}^{ - 1} mass = 12g \\ n = \frac{mass}{molar \: mass} \\ n(mg) = 1.01mol wich \: is \: substance \: a\\ n(h2o) = 0.67mol \: which \: is \: substance \: b \\ \frac{ |n|a }{ |n|b } : \frac{a}{b} \\ \frac{1.01}{0.67}: \frac{1}{2} \\ 1.51 > 0.50 \\ therefore \: substnce \: b \: which \: is \: water \: steam \: is \: limiting \: reagent [/tex]

Answer:

-22750.5J or -2.28× 10⁴J

Explanation:

q=(75.0g)(4.184J)(27.5°C-100.0°C)

q= -22750.5J

q= -2.28× 10⁴J

At STP

So

Apply Boyles law

Answer:

I think the answer should be 147

Explanation:

Answer: The butterfly effect

Explanation:

Answer:

Magnesium

Explanation:

Answer:

speed = wavelength × frequency

wavelength = Speed/frequency

wavelength = 2.998 x 10^8 m/s ÷ 6.1 x 10^9 Hz

wavelength = 0.049m

Answer:

n, the number of moles of gas is the same

Explanation:

PV = n RT     if    P  and V and T  and R are the same , the n must be the same

n = numer of moles