How many moles of nitric acid are present in 50.0 g?

Answer:

0.805 or 0.781 depending on the method used.

Explanation:

Data provided

half life ie t1/2= 8days.

No= 50g

t=48days

Nt=?

Method 1

Formula: Nt= No(1/2)^n

where n= number of half lives.

= t/t1/2 = 48/8

=6.

thus Nt= 50(1/2)^6= 0.781

Method 2

Formula: Nt= Noe^-(lambda)t

where lambda= decay constant

= ln2/ t1/2= ln2/ 8 = 0.086.

thus Nt= 50e^-(0.086×48)= 0.805.

Answer:

Balanced forces are forces that act in opposite directions and cancel each other out

let me know if you have any other questions

Answer:

Explanation:

Explanation:

92 protons 92 electrons and 146 neutrons

Answer:

92 protons, 92 electrons, 146 neutrons

Explanation:

U-238 has 92 protons, 92 electrons, 146 neutrons.

The 238 is mass number talking about protons + neutrons. Uranium will always have 92 protons so the rest of the things are neutrons (146). Electrons will always equal protons if the element is neutral (no charge) and since no charge was given the numbers will match

Answer:

Sodium has one valence electron. Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd row of the periodic table, the valence electrons will be found in the 3rd shell.

Answer:

A. The sun's rays strike the water more directly near the equator.

Explanation:

I pass the test

Explanation:

2, 8, 8, 2 is the electron arrangement of Calcium.

The way that the "orbitals", the shells, fill up is given as

[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10}[/tex] . . . etc etc.

It is more stable for the fourth shell to start filling up with an electron pair, and then subsequent electrons filling up the third shell again.

So while potassium 19, is 2,8,8,1

And calcium 20, is 2,8,8,2

Scandium 21 will fill up as, 2,8,9,2

This will continue until we reach Zinc 30, which will fill up as 2,8,18,2. The third shell is now "full", and the fourth shell will now being to fill up.

The fourth orbital starts getting filled up again, Gallium 31, is 2,8,18,3

Answer:

5.74 gm

Explanation:

First, use the ideal gas law   PV = n RT

  to find the number of moles, then multiply by 28 g/ mole

PV = n RT    T must be in Kelvin    R = 8.314463 L kPa/(K - Mol)

                         ( make sure you use the R with the correct units!!)

182 kPa * 3 L  =  n (8.314463 ) ( 273.15+47.2)

 solve for n = .205 moles

.205 mole * 28 g/mole = 5.74 gm  

The mass of the gas can be calculated using ideal gas law. The mass of the gas is approximately 1.37 g.

According to ideal gas law, the pressure , volume temperature and number of a moles of a gas is related as :

PV = nRT

To calculate the mass of a gas that would fit into a container at a given temperature, pressure, and volume, we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

We can rearrange this equation to solve for the number of moles:

n = PV/RT

Once we know the number of moles, we can use the molar mass of the gas to calculate the mass of the gas:

mass = n x molar mass

where molar mass is given as 28.0 g/mol.

Substituting the given values, we get:

n = (182 kPa) x (3.00 L) / [(8.31 J/mol-K) x (47.2°C + 273.15)] = 0.0489 moles

mass = 0.0489 moles x 28.0 g/mol = 1.37 g

Therefore, the mass of the gas that would fit into a 3.00 L container at 182 kPa and 47.2°C is approximately 1.37 g.

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A dodecahedron must have 12 faces

Of these 12 faces, two must be the top & base.

So there shall be 10 faces on the lateral surface.

Hence there shall be 5 on one half & 5 on the other half.

To have 5 faces on the base of a regular polygon, the base must have 5 sides.

So it must be a regular pentagon.

The faces of a regular dodecahedron are regular pentagons.

Option C) is the right answer.

An image is attached for your reference.

Explanation:

See below~

[tex] [OH^{-}] = 0.001 \\ = 10^{-3} M \Longrightarrow pOH = 3 \\ pH + pOH = 14 \Longrightarrow pH = 14-3 = 11[/tex]

The pH of a 0.0010 M NaOH solution is approximately 11.

To calculate the pH of a solution, you need to determine the concentration of hydrogen ions ([H+]). In the case of a strong base like NaOH, the concentration of hydroxide ions ([OH-]) can be used to calculate the concentration of hydrogen ions.

Given that NaOH is a strong base, it dissociates completely in water to form Na+ and OH- ions. The concentration of hydroxide ions can be assumed to be the same as the concentration of NaOH.

In this case, the concentration of NaOH is given as 0.0010 M.

Since [OH-] = 0.0010 M, we can use the Kw (ionization constant of water) to calculate [H+].

Kw = [H+][OH-] = 1.0 x [tex]10^{-14}[/tex]

[H+] = Kw / [OH-]

[H+] = (1.0 x [tex]10^{-14}[/tex]) / (0.0010)

[H+] = 1.0 x [tex]10^{-11}[/tex]M

To calculate the pH, we use the formula: pH = -log[H+]

pH = -log(1.0 x [tex]10^{-11}[/tex])

pH ≈ 11

Therefore, the pH of a 0.0010 M NaOH solution is approximately 11.

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Answer:

sugar I like it I think iyrx

Part 1

Part 2

Answer:

A. Clear and Sunny

Explanation:

The answer would be A. Clear and Sunny. A high pressure system occurs where the air mass above the Earth is denser than in surrounding areas, and therefore exerts a higher force or pressure. They usually happen with li9ght winds. Using process of elimination, it could not be D. Warm and Stormy, C. Cloudy and Rainy, or B. Cold and Stormy because all have wet climates.

The molecularity of the elementary step X + X + Y → Z is 3.

Molecularity in chemistry is defined as the total number of molecules that react in an elementary reaction .

In the given question the elementary reaction given is

X + X + Y → Z?

or 2X +Y --> Z

X molecule is 2 and Y molecule is 1 so the molecularity is 2+1 = 3

The molecularity of the elementary step X + X + Y → Z is 3.

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The equilibrium constant shows the extent to which reactants are converted into products.

In this case, we must find the reaction quotient as follows;

Qc = [0.55]^2/[0.12] = 2.5

Since the Qc > Kc, it means that the reverse direction is favored in this reaction.

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Answer:

V⬇2=64.mL this is the answer and the 2 is supposed to be at the bottom which the arrow stands for so do not put the arrow with that

Grams per liter in the solution give the density of the solution. The density of the solution is 27.4 g/L. Thus, option d is correct.

Density is the ratio of the mass in gms to the volume of the solution in liters.

Given,

Mass of  potassium chloride = 8.210 gms

Volume of solution = 0.300 L

Density is calculated as:

ρ = mass ÷ volume

= 8.210 ÷ 0.300

= 27.36 g/L

Therefore, the density of the solution is 27.4 g/L.

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that science I'm not good really at that

Answer:

1.1: Taking Measurements. Chemists measure the properties of matter and express these measurements as quantities. A quantity is an amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the scale of measurement is.

Answer:

D.+1°e symbol represents a type of radiation that has the same mass as an electron and a positive charge.

Answer:

a lithium atom (Z=3, A=7 AMU) contains three protons (found from Z), three electrons (as the number of protons is equal to the number of electrons in an atom), and four neutrons (7 – 3 = 4).

Explanation:

If more ammonia is added to the reaction at equilibrium, the equilibrium will shift to the right.

The principle states that reactions at equilibrium will always adjust to neutralize any effect due to constraints.

Thus, ammonia being a reactant in the reaction will make the equilibrium shift to the right because the reaction will adjust to annul the effects of increasing the concentration of ammonia in the reaction.

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Empirical formula mass

Molar mass=232.2g/mol

Find n

Molecular formula

Find the empirical formula mass

Find n

Round to nearest whole

Molecular formula

Answer:

warm air over the land and cool air over the ocean.

see the attached file!!

To determine the name of an anion, you take the name of its element and replace the end with "ide".

An anion in chemistry is a negatively charged ion.

Anions are usually formed when a non-metallic atom gains electron(s).

An anion is usually named by taking the elemental name, removing the ending, and adding “ide.

Examples of anions are as follows:

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Answer:

0.82 moles CO₂

Explanation:

To convert from grams to moles, you need to find the molar mass of CO₂. This conversion is a ratio stating the amount of grams CO₂ per 1 mole. The molar mass is calculated using the molar mass of each element (in CO₂) from the periodic table.

Molar Mass (Carbon): 12.011 g/mol

Molar Mass (Oxygen): 15.998 g/mol

Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)

Molar Mass (CO₂): 44.007 g/mol

36 grams CO₂               1 mole
----------------------  x  --------------------------  = 0.82 moles CO₂
                                 44.007 grams

A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.

A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.

So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol

Therefore, -3115 kJ/mol of heat is released.

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Answer:

Ideal Solution: An ideal solution is a solution where interactions between molecules are identical between all the molecules in the solution. Non ideal Solution: A non ideal solution is a solution that has differences in the interactions between molecules of different components in the solution.

Explanation:

Answer:

Ideal solutions obey Raoult's law over entire range of concentrations. Nonideal solutions do not obey Raoult's law over the entire range of concentrations. 2. The vapour pressure of ideal solution always lies between vapour pressures of pure components.

The final volume of the nitrogen sample would be 790 mL

According to Charles, at constant pressure, the volume of a gas is directly proportional to its temperature.

Mathematically: v1/t1 = v2/t2, where v1 and v2 = initial and final volume, and t1 and t2 = initial and final temperature.

In this case, t1 = 37 °C or 310 K, t2 =  77 °C or 350 K, v1 = 700 mL

Thus: v2 = v1 x t2/t1 = 700 x 350/310 = 790 mL

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Answer:

b

Explanation:

this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators