CHEMISTRY
HIGH SCHOOL

Answer:

0.35 grams of Argon gas will dissolve at 78 bar pressure in 1.5 liters of water.

What is ideal gas equation?Ideal gas equation for any gas at standard condition will written as:

PV = nRT, where

P = pressure

V = volume

n = no. of moles

R = universal gas constant

T = temperature

For this equation volume and temperature is constant, so the required equation will be:

P₁/P₂ = n₁/n₂, where

P₁ = given pressure = 62 bar

n₁ = given mass of argon = 0.278g

P₂ = resultant pressure of argon = 78 bar

n₂ = to find?

On putting all these value on the above equation, we get

n₂ = 0.278g × (78 bar / 62 bar) = 0.35 g

Hence, required mass of argon is 0.35g.

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Answer: When P1/P2 = C1/C2

and C is the molarity which = moles/volume

so, P1/P2 = [(mass1/mw)/volume] / [(mass2/mw)/volume]

P1/P2 = (mass1/mw)/1.5L / (mass2/mw)/1.5L

so, Mw and 1.5 L will cancel out:

∴P1/P2 = mass1 / mass2

∴ mass 2 = mass1*(P2 / P1)

= 0.278g * (78 bar / 62 bar)

= 0.35 g

∴ the quantity of argon that will dissolve at 78 bar = 0.35 g

and C is the molarity which = moles/volume

so, P1/P2 = [(mass1/mw)/volume] / [(mass2/mw)/volume]

P1/P2 = (mass1/mw)/1.5L / (mass2/mw)/1.5L

so, Mw and 1.5 L will cancel out:

∴P1/P2 = mass1 / mass2

∴ mass 2 = mass1*(P2 / P1)

= 0.278g * (78 bar / 62 bar)

= 0.35 g

∴ the quantity of argon that will dissolve at 78 bar = 0.35 g

HIGH SCHOOL

Find the number of moles 847g (NH4)2CO3

1 mol (NH4)2CO3 has a mass of

2N = 2 * 14 = 28

8H = 8 * 1 = 8

1 C = 12 * 1 = 12

3 O = 16 * 3 = 48

Total = 96 grams / mol

n = given mass / molar mass

given mass = 847 gram

Molar Mass = 96

n = 847 / 96 = 8.82 mols

2N = 2 * 14 = 28

8H = 8 * 1 = 8

1 C = 12 * 1 = 12

3 O = 16 * 3 = 48

Total = 96 grams / mol

n = given mass / molar mass

given mass = 847 gram

Molar Mass = 96

n = 847 / 96 = 8.82 mols

MIDDLE SCHOOL

If the substance entering the cell was in higher concentration inside the cell than outside the cell, what type of transport would be required. Explain your answer A. Active transport B. Passive transport

If the substance entering the cell was in higher concentration inside the cell than outside the cell, the type of transport that would be required here is known as Active transport. Thus, the correct option for this question is A.

What is Active transport?Active transport may be defined as a type of transport that occurs against the concentration gradient and therefore it is mediated by carrier proteins. In this type of transport, metabolic energy is utilized in order to move ions or molecules against the concentration gradient. It is directly opposite to passive transport.

Active transport results in the accumulation of solute on one side of the membrane. It is different from the carrier proteins mediated facilitated diffusion. This transport decreases the entropy of the reaction.

Therefore, active transport would be required in order to migrate any substance from a lower concentration to a higher concentration. Thus, the correct option for this question is A.

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This should be under biology.

To transport the substance inside the cell when the concentration inside the cell is already higher than outside the cell would require active transport because the substance would be moving against its concentration gradient.

To transport the substance inside the cell when the concentration inside the cell is already higher than outside the cell would require active transport because the substance would be moving against its concentration gradient.

COLLEGE

Gold forms a substitutional solid solution with silver. Calculate the number of gold atoms per cubic centimeter (in atoms/cm3) for a silver-gold alloy that contains 29 wt% Au and 71 wt% Ag. The densities of pure gold and silver are 19.32 and 10.49 g/cm3, respectively, and their respective atomic weights are 196.97 and 107.87 g/mol.

Answer:

Gold: 1.1 x 10²² atoms/cm³

Silver: 4.8 x 10²² atoms/cm³

Explanation:

100 g of the alloy will have 29 g of Au and 71 g of Ag.

19.32 g Au ____ 1 cm³

29 g Au ______ x

x = 1.5 cm³

10.49 g Ag ____ 1 cm³

71 g Ag _______ y

y = 6.8 cm³

The total volume of 100g of the alloy is x+y = 8.3 cm³.

Gold:

196.97 g Au____ 6.022 x 10²³ atoms Au

29 g Au _______ w

w = 8.9 x 10²² atoms Au

8.9 x 10²² atoms Au ____ 8.3 cm³

A ____ 1 cm³

A = 1.1 x 10²² atoms Au

Silver:

107.87 g Ag____ 6.022 x 10²³ atoms Ag

71 g Ag _______ w

w = 4.0 x 10²³ atoms Ag

4.0 x 10²³ atoms Ag ____ 8.3 cm³

B ____ 1 cm³

B = 4.8 x 10²² atoms Ag

MIDDLE SCHOOL

The group of elements alkali metals react with are called the?

Hey there,

The answer is Group 1 elements.

Hope this helps :))

~Top

The answer is Group 1 elements.

Hope this helps :))

~Top

HIGH SCHOOL

The name given to a substance's state (solid, liquid, or gas) at room temperature (25°c or 298 k) and a pressure of 100 kpa is its _____ state.

The name given to a substance's state (solid, liquid, or gas) at room temperature (25°c or 298 k) and a pressure of 100 kpa is its standard state.

What do you mean by standard state ?If the pressure of a gas is 1 atm, it is said to be in standard state conditions. A solute is said to be in standard state conditions if its concentration is 1 M. Pure solids and liquids exist in their natural states.

The standard states of elements are the forms that they take at 25°C and 1 atmosphere of pressure. These element forms are the reactants in multi-element substance formation equations.

A material's standard state is a reference point used to calculate its properties under various conditions. Although the IUPAC recommends a conventional set of standard states for general use, the choice of standard state is arbitrary in principle.

Thus, The name given to a substance's state (solid, liquid, or gas) at room temperature (25°c or 298 k) and a pressure of 100 kpa is its standard state.

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The conditions given are stp or standard temperature and pressure. This would be considered the substance's standard state.

COLLEGE

What is the mass percent concentration of solution containing 30 g kcl and 160 of water assume a density of 1.00g/ml for water?

Answer:

The mass percent = 15.79 %

Explanation:

Step 1: Data mass

Mass KCl = 30 grams

volume of water = 160 mL

density of water = 1.00 g/mL

Step 2: Calculate mass of water

mass water = volume * density of water

mass water = 160 mL / 1.00 g/mL

mass = 160 grams

Step 3: Calculate total mass of solution

30 grams + 160 grams = 190 grams

Step 4: Calculate mass % :mass KCl / Mass of solution

% mass = (30 grams / 190 gram) *100%

% mass = 15.79 %

The mass percent = 15.79 %

MIDDLE SCHOOL

Calculate molarity of 0.50 mol of LiNO3 in 6.50 L of solution

Molarity is calculated by taking the ratio of no. of moles of solute to the volume of solution in liter. The molarity of the solution containing 0.50 mol of the solute in 6.50 L of solution is 0.07 M.

What is molarity?Molarity is a term used to represent the concertation of a solution. Mathematically it is the ratio of no. of moles of solute to the volume of solution in liters.

Given that the no. of moles of solute is 0.50 and the volume is 6.50 L. Molarity of this solution is calculated as follows;

Molarity = no.of moles/ volume in L

= 0.50 mol / 6.50 L

= 0.07 mol/L

Hence, molarity of the given solution is 0.07 molar.

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molarity (M) = mol / Liters

molarity = ?

mol of LiNO3 = 0.50 mol

Volume = 6.50 L

molarity = 0.50 mol / 6.50 L

molarity = 0.0769 mol/L

Hope this help!

HIGH SCHOOL

In a second-order reaction (one that is second order in one reactant), cutting in half the concentration of that reactant will have what effect on the reaction rate? A) The reaction rate will remain the same.

B) The reaction rate will double.

C) The reaction rate will decrease by a factor of two.

D) The reaction rate will increase by a factor of four.

E) The reaction rate will decrease by a factor of four.

A second order reaction varies with the square of the concentration of the reactant. Therefore, halving the concentration will reduce the rate of reaction by a factor of 4.

The answer is E.

The answer is E.

Answer: D) The reaction rate will increase by a factor of four.

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

given order =2 , thus rate law is:

(1)

On cutting the concentration of A to half

(2)

Dividing 2 by 1

HIGH SCHOOL

Which of the following pairs of elements is most likely to form an ionic compound? a. helium and oxygen

b. magnesium and chlorine

c. chlorine and bromine

d. potassium and sulfur

e. sodium and potassium

f. nitrogen and iodine

Answer:

The correct option is B.

Explanation:

Ionic bond are usually formed between a metal and a non metal. The metal usually acts as the electron donor while the non metal acts as the electron acceptor, that is, the metal give away electrons while the non metal accept the electrons. In the options given in this question, it is only the pairs in option B, that is qualify for ionic bond, this is because it consist of a metal and a non metal.