a chemist needs to prepare 2.50 l of a 0.350 m solution of potassium permanganate (kmno4 ). what mass of kmno4 does she need to make the solution?

Answer: B if two samples of different elements have the same mass, they contain the same number of moles.

Explanation:

Answer:

A

Explanation:

Because I am right

Answer:

the atomic number is 11

Explanation:

Mass of aluminum that can be heated is 11.65 gram

It is given that

initial temperature of aluminium = 24 degrees Celsius = 297 K

final temperature of aluminium = 65 degrees celsius = 338 K

heat gain = 430 j of heat

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Hence it is important as it will give an indication of how much energy will be required to heat or cool an object of a given mass by a given amount.

Q = mc∆T

Q = Heat energy

m = mass of substance

c = specific heat capacity of substance

∆T = change in temperature

So, specific heat capacity for aluminium is 0.9 J/g K

Q = mc∆T

430 = m x 0.9 x (338 - 297)

430 = m x 0.9 x 41

m = 430/0.9 x 41 = 11.65 gram

Hence, Mass of aluminum that can be heated is 11.65 gram

Learn more about Specific Heat capacity here:

https://brainly.com/question/21406849

#SPJ9

Answer:

The answer for

a) p block

b) s block

c) s block

d) d block

They transfer pollen from one flower to another. Hence option A is the correct answer.

Pollen is a mass of microspores in a seed plant that appears as fine dust. Each pollen grain is a minute body of diverse shape and structure that forms in the male structures of seed-bearing plants and is transferred to the female structures by various ways (wind, water, insects, etc.) where fertilization happens.

In summary, pollination is the initial stage in the production of seeds, which results in the formation of new plants.

Learn more about pollination here:

https://brainly.com/question/3431390

#SPJ1

The balanced chemical reaction for the given chemical equation is given by; 3Ba3N2 + 6H2O → 6Ba(OH)2 + 2NH3. Therefore, the balanced values for w, x, y and z are 3, 6, 6, and 2, respectively.

The balanced chemical reaction for the given chemical equation can be obtained by following the below steps;

Count the number of atoms of each element on both sides of the chemical equation

Find the coefficients to balance the number of atoms on both sides of the chemical equation

Check the balance of the chemical equation

Write down the balanced chemical equation by putting coefficients to the molecules. The balanced chemical reaction is; 3Ba3N2 + 6H2O → 6Ba(OH)2 + 2NH3. Therefore, the balanced values for w, x, y and z are 3, 6, 6, and 2, respectively.

More on chemical reaction: https://brainly.com/question/22817140

#SPJ11

Answer:

355Joules

Explanation:

The amount of heat absorbed can be calculated using the formula:

Q = m × c × ∆T

Where;

Q = amount of heat absorbed in joules

m = mass of substance in grams

c = specific heat capacity of solid (0.727 J/g°C)

∆T = final temperature - initial temperature (°C)

According to the information provided in this question;

Q = ?

m = 12.3g

∆T = 62.1°C - 22.4°C = 39.7°C

c = 0.727 J/g°C

Using Q = m × c × ∆T

Q = 12.3 × 0.727 × 39.7

Q = 355.001

Q = 355Joules

Hence, 355J of heat was absorbed

Answer:

A climate change

Explanation:

the surrounding area would be effected in all ways imaginable, such as change in air, soil, water, plants, animals. and if you eat those said animals those harmful things can transfur into you

Accrued expenses is the most likely item on the income statement and balance sheet to vary spontaneously with sales (option 3).

Accrued expenses refer to an expense that a company has incurred but has not yet paid for. For example, wages that employees have earned but not yet received payment for, rent, interest, and taxes that have been accrued but not yet paid are all examples of accrued expenses.

Accrued expenses are spontaneous liabilities, which means they vary in proportion to a company's sales volume. The higher the sales, the more the company is likely to owe in accrued expenses. The company must record the accrued expenses as liabilities on the balance sheet and as expenses on the income statement.

Accrued expenses are likely to increase when sales volume increases, and they decrease when sales volume decreases. It means that accrued expenses are the most likely item on the income statement and balance sheet to vary spontaneously with sales.

Learn more about accrued expenses here:

https://brainly.com/question/28659299

#SPJ11

Star A will have blue color as hottest stars are blue in color.

For more information on color of star kindly visit to

https://brainly.com/question/7513288

#SPJ1

The molar concentration of Al(OH)₃ in the solution is 1.61 M.

we need to calculate the number of moles of Al(OH)3 in the solution:

Number of moles of Al(OH)₃ = mass of Al(OH)3 / molar mass of Al(OH)3

Molar mass of Al(OH)₃ = (1 x atomic mass of Al) + (3 x atomic mass of O) + (3 x atomic mass of H)

Molar mass of Al(OH)₃ = (1 x 26.98 g/mol) + (3 x 16.00 g/mol) + (3 x 1.01 g/mol) = 78.00 g/mol

Number of moles of Al(OH)₃ = 62.7 g / 78.00 g/mol = 0.804 moles

Next, we need to calculate the volume of the solution in liters:

Volume of solution = 500.0 mL = 500.0 mL x (1 L/1000 mL) = 0.500 L

Finally, we can calculate the molar concentration of Al(OH)₃

Molarity = moles of solute/volume of solution in liters

Molarity = 0.804 moles / 0.500 L = 1.61 M

Therefore, the molar concentration of Al(OH)₃ in the solution is 1.61 M.

learn more about Molar Mass here

https://brainly.com/question/837939

#SPJ1

Explanation:

6, -5, -1, 1/2 is wrong because the angular momentum quantum number cannot be negative.

Answer:

I prob can bc I'm a bad b*tch

lol

Answer:

Slytherine

Explanation:

I hope you have a wonderful rest of your day!!!! :)

Answer:

the correct answers is "neutralize"

Explanation:

When an acid is related to a base or also called an alkali and they reach a pH of 7, this acid will be neutralized or it will be canceled as the question says.

This happens so it reaches an equilibrium between both compounds, where the solution medium where these two compounds are is NEITHER ACID NOR BASIC, that is why it is called NEUTRAL medium.

Whenever you read that the pH of a solution is balanced, a neutralized acid, or a ph7 it means that the solution is NEUTRAL.

The pressure in the compartment would be approximately 52.29 atmospheres

The ideal gas law equation can be applied here: PV = nRT

where P is the pressure (in atmospheres or Pascals).

Volume (measured in litres)

The number of moles is n.

R = 0.0821 L atm/mol K, the ideal gas constant.

Temperature (in Kelvin) equals T.

The provided temperature must first be converted from Celsius to Kelvin:

T(K) equals T(°C) plus 273.15 K = 45.0 + 273.15 K = 318.15 K

We may rearrange the ideal gas law equation to solve for pressure if the volume is 0.050 L, we want to determine the pressure, and we have the same number of moles of N2 as in the prior situation.

P = (nRT) / V

P = (1 mol * 0.0821 L atm/mol K * 318.15 K) / 0.050 L P = 52.29 atm is the result of substituting the variables.

Consequently, 52.29 atmospheres would be the compartment's pressure.

for more questions on Pressure
https://brainly.com/question/24719118
#SPJ8

Answer:

Ca(NO3)2 + 2H2O.

Explanation:

The term "neutralization reaction" refers to a chemical process in which an acid is neutralized by a base and water is created as a byproduct.

Nitric acid and calcium hydroxide, which is a base, react to produce calcium nitrate and water as a byproduct.

Answer:

2.5g/ mll

Explanation:

d=m/v

Answer:

Positive

Explanation:

Radioactive materials can sometimes be used to determine various aspects, such as age, composition, or presence of certain substances.

Radioactive isotopes, through their decay processes, emit radiation that can be detected and measured. This property allows scientists to use them in techniques like radiometric dating, radiography, or tracer studies, which help determine the age of objects, analyze the composition of materials, or track the movement of substances in biological or industrial processes.

The use of radioactive materials in scientific research and applications provides valuable tools for studying and understanding a wide range of phenomena. From archaeological dating to medical imaging, radioactive materials have proven to be versatile and essential in numerous fields, enabling us to gain insights into the natural world and improve various aspects of human life.

To know more about Radioactive materials click here:

https://brainly.com/question/3542572

#SPJ11

Answer:

i think it is chemical wait no physical

Explanation:

Answer:

0.88  ⋅mol   of aluminum metal in this molar quantity of salt....

Explanation:

Answer:

Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.

Explanation:

Answer:

Yes

Explanation:

In the activity or reactivity series of metals it turns out that calcium and magnesium are above aluminium

The entropy of 1 mole of N2 molecules, considered as an ideal gas occupying a cubic volume of side 1 cm, is approximately 4:  62 J/K.

To find the entropy of 1 mole of N2 molecules, we need to use the formula for entropy:

S = R * ln(W)

Where:
S is the entropy
R is the gas constant
ln is the natural logarithm
W is the number of microstates or ways the system can be arranged

For an ideal gas, the number of microstates can be calculated using the formula:

W = (V^N) / (N!)

Where:
V is the volume
N is the number of molecules

Given that we have 1 mole of N2 molecules, which is approximately 6.022 x 10^23 molecules, and the volume of the cube is 1 cm^3, we can calculate the entropy.

First, let's convert the volume from cm^3 to m^3:

1 cm^3 = (1 x 10^-2 m)^3 = 1 x 10^-6 m^3

Now, we can substitute the values into the formula for W:

W = ((1 x 10^-6 m^3)^(6.022 x 10^23)) / (6.022 x 10^23)!

To simplify the calculation, we can use the fact that ln(W) is equivalent to ln((V^N) / (N!)) = ln(V^N) - ln(N!).

ln(W) = ln((1 x 10^-6 m^3)^(6.022 x 10^23)) - ln(6.022 x 10^23)!

ln(W) = (6.022 x 10^23) * ln(1 x 10^-6 m^3) - ln(6.022 x 10^23)!

Now, substituting the values of ln(1 x 10^-6 m^3) and ln(6.022 x 10^23) into the equation:

ln(W) = (6.022 x 10^23) * (-13.8155) - ln(6.022 x 10^23)!

Finally, we can use the value of the gas constant, R, which is approximately 8.314 J/(mol·K), to calculate the entropy:

S = R * ln(W) = (8.314 J/(mol·K)) * ((6.022 x 10^23) * (-13.8155) - ln(6.022 x 10^23)!)

learn more about entropy

https://brainly.com/question/6364271

#SPJ11

Answer:

E) 9.0

Explanation:

pH = -log [1×10^-9] = 9

Answer:

1s22s22p63s2.Explanation:. The configuration notation provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom.

Answer:

1,3,2

Explanation:

N2 + 3H2-----> 2NH3