is there any way the pandemic helps this society?
\(22 \times 12\)
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\(\sf\bold{❍ Given:-}\)

NaOH is dissolved in certain kilograms of solvent and molality of solution 0.5m.

Again , same among of NaOH is dissolved in 100 grams of solvent than initial , then molality becomes 0.625m.

$\space$

Now lets find the amount of NaOH and the initial mass of solvent.

Let,

$\space$

$\sf\bold{ ❍ We\:know,}$

$\sf{Molality(m)=}$ $\sf\dfrac{No.of\:moles\:of\:solute}{No.of\:solvent\:in\:kg}$

$\space$

$\sf\bold{Putting\:the\:formula:-}$

$\space$

$\sf\huge\underline\bold{ ❍Case:1}$

$\space$

$\longmapsto$ $\sf\small{0.5}$ $\sf\dfrac{x}{y}$

$\space$

$\longmapsto$ $\sf{0.5y = x }$

$\space$

$\longmapsto$ $\sf{multiply\:by\:2→ y = 2x}$

$\space$

$\sf\huge\underline\bold{ ❍Case:2}$

$\space$

$\longmapsto$ $\sf\small{0.625}$ $\sf\small\dfrac{x}{y}$ = $\sf\dfrac{x}{y=100g}$

$\space$

$\longmapsto$ $\sf\small{0.625}$ $\sf\dfrac{x}{y-100/1000kg}$ = $\sf\dfrac{x}{y-0.1kg}$

$\space$

$\longmapsto$ $\sf{0.625(y-0.1kg)=x}$

$\space$

$\longmapsto$ $\sf{0.625y-0.0625=x}$

$\space$

$\sf\small\bold{By\:putting\:the\:value\:of \:"x" we\: get:}$

$\space$

$\longmapsto$ $\sf{0.625(2x)-0.0625 = x}$

$\space$

$\longmapsto$ $\sf{1.25x 0.0625 = x}$

$\space$

$\longmapsto$ $\sf{1.25x - x = 0.0625}$

$\space$

$\longmapsto$ $\sf{0.25x = = 0.0625}$

$\space$

$\longmapsto$ $\sf\small{x=}$ $\sf\dfrac{0.0625}{0.25}$= $\sf\bold{x=0.25}$

$\space$

$\sf{So,y=2(x)=2\times0.25=}$ $\sf\bold{y=0.5}$

$\space$

$\sf\small{Initial\:mass\:of\:solvent:0.5kg=500g}$

$\space$

$\sf{Now,}$

Amount of NaOH=

$\space$ $\space$ $\space$ $\space$ $\space$ $\sf{=x\times molar\:mass}$

$\space$ $\space$ $\space$ $\space$ $\space$ $\sf{=0.25\times 40=10}$

$\space$

$\sf\underline{\underline{ ⚘ Hence,amount\:of\:NaOH=10kg}}$

_______________________________

Answer:

okay

Explanation:

Coconut, palm, mangroves, water lily, water mint, are a few examples of plants whose seed are dispersed by the water.

It will take 13.2 hours for 28 g of the substance to be depleted to 3.5 g.

We can use the following radioactive decay formula to solve this problem:

N = N0 * (1/2)^(t/T)

Where:

N = Final amount of the substance

N0 = Initial amount of the substance

t = Time passed

T = Half-life of the substance

Let's first find the number of half-lives that will pass as 28 g of the substance is depleted to 3.5 g:

28 g * (1/2)^(n) = 3.5 g

(1/2)^(n) = 3.5 g / 28 g

(1/2)^(n) = 0.125

n = log(0.125)/log(1/2)

n = 3

So, 3 half-lives will pass. Since the half-life is 4.4 hours, the total time it will take is:

t = n * T

t = 3 * 4.4 hr

t = 13.2 hr

Therefore, it will take 13.2 hours for 28 g of the substance to be depleted to 3.5 g.

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Answer: the answer is A. Zinc (ZN)

Explanation: jus did a quiz with this quest thx for da points good luck :D

Answer:

100 degree celcius, because it is the melting point of ice ob

Answer: The correct answer is 100 °C, because it is the boiling point of water.

Explanation: A heating curve has two flat lines(Or plateaus). The first one is the melting point, the second one is the boiling point. In your problem, C is the second flat line, so it is boiling point.

Answer:

Explanation:

1. a student conduct an experiment she found that her actual yield was

20g. the theoretical yield for the experiment is 25g. calculate the percent

yield for the reaction

Answer:

The unbalanced chemical equation is;

C. N₂O₅ + H₂O → HNO₃

Explanation:

In balancing a chemical reaction equation, only the coefficients of the terms of the reactants and/or the products are adjusted (and not the subscripts to the atoms in the compounds) to ensure that the total number of each element is the same on either side of the arrow for the chemical reaction

A coefficient term is the number multiplier of the compounds and elements in a chemical reaction

Therefore, the balanced chemical equation is obtained by changing the coefficient of the product from the implied '1' to a '2' as follows;

N₂O₅ + H₂O → 2HNO₃

A renewable fuel called ethanol is created from various plant elements known as "biomass."

Thus, Ethanol is used to oxygenate more than 98% of the gasoline sold in the United States. E10 (10% ethanol, 90% gasoline) is typically added to gasoline, which lowers air pollution.

Ethanol is also available in the form of E85 (also known as flex fuel), which can be used in vehicles that can run on any gasoline and ethanol mixture up to an 83% concentration.

Since ethanol has a greater octane rating than gasoline, it offers superior mixing qualities. Engine knocking is prevented and drivability is ensured by minimum octane number regulations for fuel.

Thus, A renewable fuel called ethanol is created from various plant elements known as "biomass."

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Answer:

.355mol

Explanation:

\(?mol=32g * \frac{1mol}{90.1g}\)

Method is dimensional analysis

Cancel out units until you have your answer unit

Answer:

IT IS CORONAAAAAAAAAAAAAAAAAAAAA

Answer:

coronavirus is a lung disease, it makes it so that you have a fever, cough, trouble breathing, mild headaches, and sometimes even nausea. you should be cautious because if your at high risk your gonna have trouble recovering from it. wearing a mask could help protect others from the spread of coronavirus. others wearing a mask prevents you from the spread of coronavirus. if you do catch it, make sure you see your doctor and isolate yourself for two weeks to a month and try not to go out as much.

125 ml of ethanol contain, of ethanol is \(2.44 moles\)

Moles are a unit of measurement used to quantify the amount of a substance. One mole of a substance is equal to 6.02 x 10^23 particles, also known as Avogadro's number. This number is used in many equations to describe the amount of a substance, such as the ideal gas law, which is PV = nRT, where n is the number of moles. Another equation used to describe moles is the mass-molarity equation, which states that the molarity of a solution is equal to the mass of the solute divided by the molar mass multiplied by the volume of the solution.The moles of ethanol present in 125 ml of ethanol can be calculated using the density and the molar mass of ethanol. The molar mass of ethanol is 46 g/mol.

Therefore, the number of moles of ethanol present in 125 ml of ethanol can be calculated using the following equation:

\(Moles=\frac{ (Density * Volume) }{ Molar Mass}\)

Moles = \(\frac{(0.789 g/ml x 125 ml) }{ 46 g/mol}\)

Moles = \(2.44 moles\)

Therefore ,125 ml of ethanol contain, of ethanol \(2.44 moles\) .

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Answer:

The formula mass of Na2S04 is 142.04 g/mol

Answer:

142.04 g/mol

Explanation:

the formula Na2SO4 means:two moles sodium (45.98g), one mile sulfur (32.06g), and four moles oxygen (64.00g) combine to form one mole of sodium surface (142.04g).

Answer:

True

Explanation:

Answer:

Synthesis

Explanation:

Answer:

electrons

Explanation:

The group number tells you the number of electrons in the element's outer shell (or valence shell).

Extra info: Elements with the same number of electrons on their outer shell are grouped together in the periodic table because they have similar properties.

Hope this helps!

Methanol has the highest boiling point.

Methanol, with its hydrogen bonding, has a much higher boiling point than ethane, which has only an instantaneous dipole. The higher boiling point indicates a much stronger attraction between molecules.

The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapor pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).

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The weight of the 3 lb roast purchased by the housewife is 1,360.78 grams.

The weight of an object is the force acting on the object due to gravity.

The weight of an object varies from place to place across the globe due to difference in acceleration due to gravity.

1 lb ------------> 453.592 grams

3 lb ------------> ?

= (3 x 453.592)

= 1,360.78 grams

Thus, the weight of the 3 lb roast purchased by the housewife is 1,360.78 grams.

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Answer:

56.6 g/mol.

Explanation:

Assuming here that we have 100 atoms of each element. The percentage tells us that we have 10 atoms of the 55 isotope, 20 of the 56, and 70 of the 57.  

So the total is 10*55 + 20*56 + 70*57 = 5,660. And to get the average, we just divide by the total number of atoms (100).  

Atomic mass = 5660/100 = 56.6  

To determine the pKb1 of CO32-, we can use the relationship between pKa and pKb for conjugate acid-base pairs:

pKa + pKb = pKw

where pKw is the ionization constant of water, which is approximately 14. Therefore, we can rearrange the equation to solve for pKb:

The pKb value represents the negative logarithm of the equilibrium constant (Kb) for the reaction of a base with water. In this case, we are interested in the equilibrium reaction between CO32- and water, which can be represented as CO32- + H2O ⇌ HCO3- + OH-.

By utilizing the relationship pKa + pKb = pKw, we can rearrange the equation to solve for pKb. Given that pKa1 of H2CO3 is 6.35, we subtract this value from pKw (approximately 14) to obtain pKb1

pKb = pKw - pKa

pKb1 = 14 - 6.35 = 7.65

Since none of the given answer choices matches the calculated value, it seems there might be an error or omission in the available options. Please double-check the answer choices provided or refer to additional information to obtain the correct pKb1 value for CO32-.

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Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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Answer:

Lithium Reaction: Hydrogen Moles

User

The alkali metal lithium reacted with water. Calculate how many grams, moles of hydrogen were released if 56 g of lithium reacted?

ChatGPT

To calculate the number of grams and moles of hydrogen released when 56 g of lithium reacts with water, we need to determine the balanced chemical equation for the reaction.

The balanced chemical equation for the reaction between lithium and water is:

2 Li + 2 H₂O -> 2 LiOH + H₂

From the equation, we can see that 2 moles of lithium react to produce 1 mole of hydrogen gas.

Now, let's calculate the moles of lithium in 56 g of lithium using its molar mass:

Molar mass of lithium (Li) = 6.94 g/mol

Moles of lithium = Mass of lithium / Molar mass of lithium

= 56 g / 6.94 g/mol

≈ 8.06 mol

Since 2 moles of lithium produce 1 mole of hydrogen, we can calculate the moles of hydrogen produced:

Moles of hydrogen = (Moles of lithium) / 2

= 8.06 mol / 2

= 4.03 mol

Finally, we can calculate the grams of hydrogen using the molar mass of hydrogen:

Molar mass of hydrogen (H₂) = 2.02 g/mol

Grams of hydrogen = Moles of hydrogen × Molar mass of hydrogen

= 4.03 mol × 2.02 g/mol

≈ 8.15 g

Therefore, when 56 g of lithium reacts with water, approximately 4.03 moles (or 8.15 grams) of hydrogen gas are released.

It would fail at the first step because the acetaminophen and sucrose would stay solid and would not be separated due to both being insouble in DCM.

A method that courts might employ to modify the case management procedure to meet the needs of specific cases is differentiated case management (DCM). DCM offers a method for handling each case in accordance with the amount of time and resources needed from the legal system.

If you simply have a few points or a small budget, the Discrete Control Module (DCM) is the ideal option for controlling equipment at remote locations. You can control up to 16 control relays while keeping an eye on two alarm inputs.

Acetaminophen, usually referred to as paracetamol, is a drug used to treat fever and mild to moderate discomfort. Tylenol and Panadol are examples of popular brand names.

It lowers temperature and eases pain.

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Answer: Sterilization

Explanation:

The pipette needs to be sterile so that nothing interferes with the DNA sample.

The process that involves a decrease in the dispersal of matter is the precipitation of matter.

Here, precipitation of the solid represents the transformation of the liquid to the solid.

Dispersal of matter refers to the process in which it contains the additional space that should be occupied. For example, in the conversion of the liquid  substance to gaseous substance represents that there should be increment in the dispersion of the matter since the particles of the gas comprises of more empty space at the time when the comparison is to be done with the particles of liquid.

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Answer:

The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.

The problem is solved by balancing the reaction equation as shown below. The stoichiometry of the reaction is now applied in solving the question.

The balanced reaction equation is:

SiO2 + 6HF → H2[SiF6] + 2H2O

Using stoichiometry

The amount of silicon dioxide reacted = 12.5 g/60.08 g/mol = 0.21 mole

1 mole SiO2 yields 2 moles of H2O

0.21 mole of SiO2 yields 0.21 * 2/1 = 0.42 moles of H2O

The amount of HF reacted = 24.6 g/20.01 g/mol = 1.23 moles of HF

6 moles of HF yield 2 mole of H2O

1.23 moles of HF yields 2 * 1.23/6 = 0.41 moles of H2O

Hence HF is the limiting reactant.

Theoretical yield of H2O = 0.41 moles of H2O * 18 g/mol = 7.38 g

The percentage yield of the water is = actual yield/theoretical yield * 100

Hence;

% yield = 2.50 g/7.38 g * 100 = 33.9%

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Answer:

The nucleus contains protons, which have a positive charge

Explanation:

Answer: 1. Ions

2. Cation

Explanation:

No explanation; this is basic vocabulary. :)

Answer:looks spicy

Explanation:what are you asking

Explanation:

Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.