a gas made up of n and o contains 30.4% n. at stp (0oc and 1 atm), 4.0 g of the gas occupies a volume of 0.974l. calculate the molecular formula. (think: when you have, p, v and t, what can you calculate?) also recall calculating empirical formula and molecular formula?)

Answer:

More than 50% of the 100 billion stars in the Milky Way galaxy have at least one planet orbiting.

Explanation:

This is False so this would be your Answer

Answer: planets orbiting stars in the habitabke zone are likely to have life existinv on them

Explanation:

because it is false and i took the quiz

The hydrogen ion concentration of the 0.55 M solution of HCN is 1.85 x 10⁻⁵ M.

The dissociation of the weak acid is determined as;

HCN + H₂O ⇌ H₃O⁺ + CN⁻

Ka = [H₃O⁺][CN⁻] / [HCN]

Let x be the concentration of [H₃O⁺] formed by the dissociation of HCN.

At equilibrium, the concentration of [CN⁻] formed = x

the concentration of HCN remaining at equilibrium = (0.55 - x) M.

6.2 x 10⁻¹⁰ = x² / (0.55 - x)

3.41 x 10⁻¹⁰ - 6.2 x 10⁻¹⁰x = x²

x = 1.85 x 10⁻⁵ M

Learn more about hydrogen concentration here: https://brainly.com/question/29033205

#SPJ1

The given pressure and temperature conditions correspond to 1.98 atm and 74.5 °C, respectively. The density of nitrogen gas at 1.98 atm and 74.5 °C is 0.972 g/L.

What is density?

Density is the mass of a substance per unit volume. Its SI unit is kg/m³.

The formula to find the density of any object is given:

density = mass/volume

Here, the density of nitrogen gas at 1.98 atm and 74.5°C is asked.

It can be calculated by using the ideal gas law, which is given as:

PV = nRT

Where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature.

We can manipulate the ideal gas law to solve for density as follows:

density = (n x molar mass) / volume

The molar mass of nitrogen is 28 g/mol. We can substitute the given values in the ideal gas law to find the number of moles of nitrogen gas. n = PV / RT

Substituting the given values, we get:n = (1.98 atm) x (1.01325 x 10^5 Pa/atm) x (0.08206 L.atm/mol.K) x (347.65 K) / (101325 Pa/atm) = 0.0878 mol

Now, substituting the values of n, molar mass, and the given pressure and temperature in the formula for density, we get: density = (0.0878 mol x 28 g/mol) / (22.4 L) = 0.972 g/L

Therefore, the density of nitrogen gas at 1.98 atm and 74.5°C is 0.972 g/L.

To know more about the density, visit:

https://brainly.com/question/29775886

#SPJ11

It will take approximately 8.26 days for the amount of iodine-131 to drop from 50.0 mg to 17.5 mg.

To determine the number of days it will take for the amount of iodine-131 (I-131) to drop from 50.0 mg to 17.5 mg, we can use the radioactive decay formula:

Amount(t) = Amount(0) * e^(-λt)

Where:

- Amount(t) is the amount of I-131 at time t.

- Amount(0) is the initial amount of I-131.

- λ (lambda) is the decay constant.

- t is the time elapsed.

We can rearrange the formula to solve for t:

t = (1/λ) * ln(Amount(0) / Amount(t))

Substituting the given values:

- Amount(0) = 50.0 mg

- Amount(t) = 17.5 mg

- λ = 0.0864 1/days

t = (1/0.0864) * ln(50.0 / 17.5)

Using a calculator, we can compute the value:

t ≈ 8.26 days

Therefore, it will take approximately 8.26 days for the amount of iodine-131 to drop from 50.0 mg to 17.5 mg.

learn more about iodine here:

https://brainly.com/question/30957837

#SPJ11

Answer:

Explanation:

A petrifying well is a well which gives objects a stone-like appearance. If an object is placed into such a well and left there for a period of months or years, the object acquires a stony exterior.

Answer:

The answer is C.

Explanation:

because measuring the pH of a substance is a chemical property. The substance must react with the litmus paper to determine its adcidity

The response is C. flammability of PH electronegativity and reactivity with other compounds. Because a substance's pH is measurable and a chemical attribute. To determine an object's acidity, it must react with litmus paper.

To learn more about litmus paper, refer to:

https://brainly.com/question/21701125

#SPJ2

Answer:

a.

Explanation:

Simple Cubic (SC): 1 atom, nearest-neighbor distance = a/2

Body-Centered Cubic (BCC): 2 atoms, nearest-neighbor distance = a

Face-Centered Cubic (FCC): 4 atoms, nearest-neighbor distance = a√2

In a crystal lattice, the number of atoms found inside a unit cell and the distance between nearest-neighbor atoms vary depending on the type of lattice structure. Let's explore the characteristics of each type of cubic crystal lattice:

Simple Cubic (SC)

Number of atoms in a unit cell: 1

Nearest-neighbor distance: The nearest-neighbor atoms are located at the corners of the cube. The distance between the center of the cube (where the atom is located) and the corner atoms is equal to half of the length of one side of the cube.

Nearest-neighbor distance = a/2

Body-Centered Cubic (BCC)

Number of atoms in a unit cell: 2

Nearest-neighbor distance: The nearest-neighbor atoms are located at the corners of the cube and one atom at the center of the cube. The distance between the center atom and the corner atoms is equal to the length of one side of the cube.

Nearest-neighbor distance = a

Face-Centered Cubic (FCC)

Number of atoms in a unit cell: 4

Nearest-neighbor distance: The nearest-neighbor atoms are located at the corners of the cube and one atom at the center of each face of the cube. The distance between the center atom of one unit cell and the corner atom of a neighboring unit cell (center to center) is equal to the length of one side of the cube multiplied by the face diagonal of a cube (√2).

Nearest-neighbor distance = a√2

It's important to note that the "a" in the above equations represents the lattice constant, which is the length of one side of the unit cell.

Learn more about Crystal lattice from the link given below.

https://brainly.com/question/10554076

#SPJ4

The Debye–Huckel equation can be used to determine the silver ion (Ag+) activity coefficient (γ)  in each solution:

log γ± = -0.509z±²√(I)/(1+1.328z±√(I))

where z± is the charge of the ion, and I is the ionic strength of the solution.

The ionic strength (I) at a temperature of 25 °C can be calculated as follows:

i = 1/2 * Σ(m * zi²)

where zi is the charge of the ion and mi is the molar concentration of the ion.

These equations can be used to determine the silver ion activity coefficient in each solution.

[Ag+] (M) I γAg+

Due to the increased ionic strength and ion–ion interactions, it should be noted that the activity coefficient drops as the concentration of silver ions increases.

Learn more about Debye–Huckel equation, here:

https://brainly.com/question/31756906

#SPJ1

Pathogenic bacteria are the most problematic in the food industry. The term "pathogenic" refers to any bacteria that are capable of causing illness when consumed by humans or animals.

Option A is correct

Pathogenic bacteria are often found in foods that are not cooked or handled correctly. This includes raw meat, unpasteurized dairy products, and foods that are stored at incorrect temperatures for an extended period of time. It is crucial for food industry professionals to follow strict safety protocols to minimize the risk of pathogenic bacteria contaminating their products, leading to foodborne illnesses.Foodborne illnesses can be caused by a variety of microorganisms, including bacteria, viruses, and parasites. Pathogenic bacteria are a significant concern in the food industry, as they can cause serious illness and even death in vulnerable populations such as young children, pregnant women, and the elderly. The most problematic bacteria in the food industry are those that are pathogenic and are capable of multiplying quickly in the food environment. Pathogenic bacteria can cause food poisoning, which is a severe illness that can result in dehydration, fever, vomiting, and diarrhea.

The symptoms can be severe and can lead to hospitalization or even death if left untreated. The most common pathogenic bacteria found in food are Salmonella, Listeria, and E.coli. These bacteria are often found in raw or undercooked meat, unpasteurized dairy products, and fruits and vegetables that are not washed correctly. It is essential for food industry professionals to follow strict safety protocols to prevent the growth and spread of these bacteria. Proper handwashing, storage, and cooking techniques can help minimize the risk of foodborne illnesses caused by pathogenic bacteria. In conclusion, pathogenic bacteria are the most problematic in the food industry. Food safety protocols should be followed to minimize the risk of foodborne illnesses caused by these bacteria.

To know more about Pathogenic bacteria visit:-

https://brainly.com/question/9673295

#SPJ11

Water has one of the greatest densities of any liquid. It has a density of 1 gram per cubic centimeter at a temperature of 4 degrees Celsius. As the temperature of water increases, its density decreases.

Here, correct answer will be

At temperatures greater than 4 degrees Celsius, water becomes less dense. At temperatures below 4 degrees Celsius, water becomes more dense. This is why ice, which is frozen water, is actually more dense than liquid water. The density of water also increases with pressure.

At a pressure of one atmosphere, the density of water increases from 1 gram per cubic centimeter at 4 degrees Celsius to 1.1 gram per cubic centimeter at 25 degrees Celsius. The density of water also decreases with salinity. The more salt that is added to water, the less dense it becomes.

Know more about density here

https://brainly.com/question/29775886#

#SPJ11

Explanation:

require an emergency support immediately

To answer your question, when a cloud forms, positive and negative particles are present. The positive particles move upward in the cloud while the negative particles move downward.

As the negative particles continue to accumulate and become too heavy, they create an imbalance of electrical charge within the cloud. This leads to a discharge of electricity, commonly known as lightning, as the negative particles seek to neutralize themselves by moving towards the positively charged ground. So, in summary, the formation of lightning is the result of an excess of negative particles within a cloud.

To know more about negative particles please vist :-

https://brainly.com/question/2924695

#SPJ11

Answer:

CaCO3 + 2HCl ---> CaCl2 + H2O + CO2

Explanation:

The reaction between solid calcium carbonate and a mineral acid such as aqueous HCl is a neutralization reaction and occurs with the evolution of CO2 gas.

The balanced equation is given below

CaCO3 + 2HCl ---> CaCl2 + H20 + CO2

The product CaCl2 is water soluble which accounts for why the stain is removed, while CO2 gas escapes away from the reaction surface.

Answer:

CaCO3(s) + 2HCl(aq) -------> CaCl2(aq) + 2CO2(g) + H2O(l)

Explanation:

CaCO3(s) + 2HCl(aq) -------> CaCl2(aq) + 2CO2(g) + H2O(l)

When an acid reacts with a metal carbonate a salt, carbon dioxide and water are formed. Hard water usually contain Ca^2+ in the form of Ca(HCO3)2. Minor heating causes CaCO3(calcium carbonate) to deposit on surfaces through which the hard water passes.

Calcium carbonate reacts with acids to produce a calcium salt, water and carbon dioxide: Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon dioxide. The carbonate radical breaks up into carbon dioxide and oxygen; the oxygen binds with the acid's hydrogen ions to make water; and a solution of calcium chloride remains.

Answer: Cu + 2AgNO3 -> 2Ag + Cu(NO₃)₂

Explanation: Assuming the teacher wants you to finish the other side of the balanced equation, here is how I would do it.

I would consider this a Single Replacement equation. This means Ag will be Replaced with Cu. Using the chart provided, it can be seen that (NO₃) has a charge of ⁻ ¹ . Therefore, it can be assumed that Ag as a ⁺¹ charge as well. However, copper has a charge of ⁺² (we know this because there are 2NO3 in the first equation and therefore there needs to be 2 when copper replaces it) so when replacing Ag with Cu, some butterfly subscript  multiplication needs to happen like the picture attached. So, finally, the equation is:

Cu + 2AgNO3 -> 2Ag + Cu(NO₃)₂

CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

for more questions on CIF
https://brainly.com/question/28297792
#SPJ8

Answer:

It blocks pathogens from getting inside our body.

Explanation:

The skin is the biggest organ, it cover the whole body and organ system from any toxic things.

U has a total of six electrons. This corresponds to carbon (C). A is the second most common element in the atmosphere.

The second most common element in the atmosphere is oxygen (O). E is a noble gas.

Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Based on the given options, E could be xenon (Xe).

S is an alkali metal.

Alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Based on the given options, S could be sodium (Na).

O is a halogen.

Halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Based on the given options, O could be bromine (Br).

O has an atomic number larger than V but smaller than W.

Based on the periodic table, the atomic number of oxygen (O) is 8, which is larger than the atomic number of vanadium (V) (23) and smaller than the atomic number of tungsten (W) (74).

The charge on an L ion is +2.

The charge of +2 indicates that L must lose two electrons to form the ion. Based on the given options, L could be calcium (Ca).

C has five electrons in its outer energy fever.

Carbon (C) has four valence electrons, not five. This contradicts the given statement, so we need to revisit the deductions.

Learn more about carbon on

https://brainly.com/question/19083306

#SPJ1

From the equation we can see that

Moles of Fe=12

Moles of Fe_2O_3:-

\(\\ \sf\longmapsto \dfrac{12}{2}=6mols\)

As per the given balanced chemical equation, one mole of iron oxide gives 2 moles of metallic iron. Therefore, 6 moles of Fe₂O₃ is required to produce 12 moles of iron.

Iron is a transition metal showing variable oxidation states. Iron is highly reactive towards oxygen  and water. Iron reacts with oxygen gives iron oxide Fe₂O₃ which is an important ore of iron.

The reaction of iron oxide with carbon monoxide gives metallic iron and carbon dioxide. As per the given balanced chemical equation of this reaction 1 mole of Fe₂O₃ gives 2 moles of Fe.

Hence, number of moles of Fe₂O₃ required to produce 12 moles of Fe is calculated as follows:

Moles of Fe₂O₃ = 12/2 = 6 moles.

Therefore, 6 moles of Fe₂O₃ is required to produce 12 moles of Fe.

Find more on Fe₂O₃:

https://brainly.com/question/2349775

#SPJ2

Answer: 20 g

Explanation: heat received Q = m c dT

Q= 50J , dT= 25 C anc c= 0.10 J / g C

And m = Q / c dT

The mass of the iron sample that received the heat is determined as 20 g.

The mass of the iron sample is calculated as follows;

Q = mcΔT

where;

m = Q/cΔT

m = (50) / (0.1 x 25)

m = 20 g

Thus, the mass of the iron sample that received the heat is determined as 20 g.

Learn more about heat here: https://brainly.com/question/13439286

#SPJ2

In this case, all gases (He, O₂, and SO₃) would have the same volume, approximately 22.4 liters, since they have the same molar volume at STP. The correct answer is:

A) All would have the same volume.

To determine which gas would have the greatest volume when given 1.00 mole of each gas at STP (Standard Temperature and Pressure), we need to consider the ideal gas law, which states:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the temperature is 273.15 K (0 degrees Celsius), and the pressure is 1 atmosphere (1 atm).

Since we have 1.00 mole of each gas, the only factor that will affect the volume is the molar volume of the gas, which is the volume occupied by one mole of the gas.

According to Avogadro's law, at the same temperature and pressure, equal volumes of gases contain an equal number of particles (moles). Therefore, for a given temperature and pressure, the gas with the greatest molar volume will occupy the greatest volume.

The molar volume of an ideal gas at STP is approximately 22.4 liters/mol.

Now, let's compare the molar masses of the gases to determine the gas with the greatest molar volume:

A) All gases have the same molar volume (22.4 liters/mol).

B) Helium (He) has a molar mass of 4.00 g/mol, and its molar volume is approximately 22.4 liters/mol.

C) Oxygen (O₂) has a molar mass of 32.00 g/mol, and its molar volume is approximately 22.4 liters/mol.

D) Sulfur trioxide (SO₃) has a molar mass of 80.06 g/mol, and its molar volume is approximately 22.4 liters/mol.

Therefore, in this case, all gases (He, O2, and SO3) would have the same volume, approximately 22.4 liters, since they have the same molar volume at STP. The correct answer is:

A) All would have the same volume.

Learn more about Volume from the link given below.

https://brainly.com/question/28058531

#SPJ4

Answer: A.

Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.

Answer:

The correct answer would be D) chlorophylls.

Explanation:

Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.

Hydrogen bonds are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.

learn about Hydrogen bond

https://brainly.com/question/10904296

#SPJ4

Answer:

Explanation:

The pressure required can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

Since we are finding the required pressure

\(P_2 = \frac{P_1V_1}{V_2} \\\)

From the question we have

\(P_2 = \frac{6 \times 1200}{200} = \frac{7200}{200} = \frac{72}{2} \\ \)

We have the final answer as

Hope this helps you

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

Know more about Equilibrium here:

https://brainly.com/question/30694482

#SPJ11