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The pressure (in mmHg) at 45,000 m, given it was 755 mmHg at launch is 0.669 mmHg

The folloeing data were obtained from the question:

The new pressure of the gas at 45000 m can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(755 × 125) / 300 = (P₂ × 94000) / 200

Cross multiply

P₂ × 94000 × 300 = 755 × 125 × 200

P₂ × 28200000 = 18875000

Divide both sides by 28200000

P₂ = 18875000 / 28200000

P₂ = 0.669 mmHg

From the calculation made above, we can conclude that the pressure at 45000 m is 0.669 mmHg

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Density is the mass of a substance per unit volume. So, adding 9.628 ml of Ag to 51ml of H2O, makes the total volume 60.628ml.

Density is the mass of a substance per unit volume. The most commonly used symbol for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [tex]{\displaystyle \rho ={\frac {m}{V}}}[/tex] where ρ is density, m is mass and V is the volume.

Density is an important concept because it allows us to determine which substances  float and which sink when placed in a liquid. In general, substances float until their density is lower than the density of the liquid in which they are placed.

Density = Mass/ water displaced

water displaced = Mass/Density

water displaced = 101 / 10.49

water displaced = 9.628 cm³  

Here 1 cm³ = 1ml

so, adding 9.628 ml of Ag to 51ml of H2O, makes the total volume 60.628ml.

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In argon Fluoride laser used in some reflective eye surgeries of electro magnetic radiation at a wavelength of 193.3nm  then the frequency is 1.72×10⁶Hz

Electromagnetic radiation is the is the form of energy that propagated both as electrical and magnetic waves traveling in packets of energy called photons

Here given data is

Wavelength = 193.3nm

Velocity = 3×10⁸m/sec

We have to find frequency = ?

Then the formula is V = λf

So rearrange this formula

f = V/ λ

f = 3×10⁸m/sec/193.3nm

f = 1.72×10⁶Hz

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The pressure in the cylinder must have been 919.5 kPa.

The pressure in the cylinder is calculated by applying general gas equation as follows;

P₁V₁/T₁ = P₂V₂/T₂

where;

P₂ = (P₁V₁T₂/T₁V₂)

The initial temperature of the cylinder = 12⁰C = 285 K

The final temperature of the cylinder = 21⁰C = 294 K

P₂ = (95.5 x 14 x 294/285 x 1.5)

P₂ = 919.5 kPa

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From the given equation of reaction:

Limiting reagents refers to the reactants in a given reaction which is completely used up at the end of a reaction.

Once the limiting reagent is used up, the reaction will stop.

Considering the given question and the data provided:

0.610 grams of hydrogen gas are allowed to react with 12.4 grams of ethylene (C₂H₄).

The equation of the reaction is as follows:

H₂ (g) + C₂H₄ (g) ---> C₂H₆ (g)

The mole ratio of the reactants is used to determine the limiting reactant.

Mole ratio of hydrogen to ethylene is 1 : 1

Moles of hydrogen = 0.610/2 = 0.305 moles

Moles of ethylene = 12.4/28 = 0.44 moles

The limiting reagent is hydrogen while the excess reagent is ethylene.

The maximum amount of ethane (C₂H₆ ) that can be formed is 0.305 moles.

mass of 0.305 moles of ethane = 0.305 * 30 grams

mass of 0.305 moles of ethane = 9.15 g

The moles of the excess reagent that remains after the reaction is complete = 0.44 - 0.305 = 0.135 moles

mass of 0.135 moles of ethylene = 0.135 * 28 = 3.78 grams

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The balanced reaction equation between carbon dioxide and  lime water is shown in the image attached to this answer.

The term reaction has to do with the combination of two or more substances in order to yield new substance. Let us note that the substances on the left hand side are called the reactants while the substances on the right hand side are called the products.

In this case, we are trying to write an equation for the combination of carbon dioxide and lime water. We know that the product that is formed in this reaction is calcium carbonate.

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Answer:

I am guessig B

Explanation:

Answer:bro

Explanation: you cant cheat on test

The reaction equation that is balanced is obtained as; [tex]P_{4} + 5O_{2} ----- > 2P_{2} O_{5}[/tex]

We know that it is common to use a chemicals reaction equation to show what is going on in a reaction system. The chemical reaction equation would include the symbols of the elements that are combined in the reaction equation.

The first rule that must be observed when we are writing a balanced reaction equation is that the number of atoms of each element on the reactant side must be the same as the number of atoms of the same element on the left hand side. This is what we call an atom count. If the atom count is not complete it then follows that the reaction equation is not balanced as written

Having said this let us now attempt to write the balanced reaction equation between phosphorus and oxygen molecules which are both poly atomic.

The balanced reaction equation is; [tex]P_{4} + 5O_{2} ----- > 2P_{2} O_{5}[/tex]

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Correct statement in the process of balance the equation CH₄+O₂ → CO₂+2H₂O then add coefficient 2 to O₂ on the left side of the equation

Balance reaction is the chemical reaction in which number atom is arranged specific manner which reaction is balanced means all elements in the reaction are balanced with specific number

And the given reaction is

CH₄+O₂ → CO₂+2H₂O then,

Place a coefficient of 2 in front of the O₂ we now have 4O atoms on both sides CH₄+2O₂ → CO₂+2H₂O

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Number of moles of water originally present in the compound is 0.060 mol

Mole is the SI unit of amount of substance of a specified elementary entity

Here given reaction is

CuSO₄ ⋅ 5H₂O → CuSO₄ + 5H₂O

And given data is  CuSO₄ =  9.60 g

So we have to find number of mole of water originally present in the compound = ?

So number of mole = mass of substance/mass of one mole

Number of mole = 9.60 g/159.6

Number of mole = 0.060 mol

Water originally present in the compound is 0.060 mol

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Answer: gas mask

Explanation: A gas mask provides optimal protection from vapor and fumes.

The volume (in mL) of the 1.6 M NaHCO₃ solution that must be poured on the spill to react completely is 286 mL

We'll begin by writing the balanced equation for the reaction. This is given below:

H₂SO₄ + 2NaHCO₃ —> Na₂SO₄ + 2H₂O + 2CO₂

The volume of NaHCO₃ can be obtained as follow:

MaVa / MbVb = nA / nB

(2.6 × 88) / (1.6 × Vb) = 1  /2

228.8 / (1.6 × Vb) = 1 / 2

Cross multiply

1.6 × Vb = 228.8 × 2

1.6 × Vb = 457.6

Divide both side by 1.6

Vb = 457.6 / 1.6

Vb = 286 mL

Thus, the volume of the NaHCO₃ solution needed is 286 mL

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The difference in volume measured by Bart and Homer is equal to 1.08 m³.

The volume of a rectangular prism is calculated by multiplying the length, breadth, and height of the rectangle. A prism consists of 2 parallel rectangular bases and four rectangular faces.

It contains six flat rectangular faces and all the angles between faces are right-angled.

The volume of a rectangular prism = l × b × h

Where “b” is the base length “l” is the base width and “h” is the height of the rectangular prism.

If the nuclear reactor is made from a rectangular sheet then we can consider the metal sheet as a rectangular prism.

The Homer's volume of metal sheet =  2.6m × 4.4m × 3.0m = 34.32 m³

The Bart's volume of metal sheet =   2.65m × 4.38m × 3.05m = 35.40 m³

The difference between Bart's volume and  Homer's volume is :

= 35.40 m³ - 34.32 m³

= 1.08 m³

Therefore, the difference between the volume of the metal sheet measured by Bert and Homer is 1.08m³.

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A buffer solution with a pH of 4.23 is prepared with the same volumes of 0.90 M HC₂H₂O₂ and O 1.2x10-9 M NaC₂H₂O₂ is 0.37.

A buffer answer is an aqueous answer along with an aggregate of a weak acid and its conjugate base, or vice versa. Its pH adjustments little or no when a small amount of sturdy acid or base is introduced to it.

Buffer solution is a water solvent based totally answer which includes a combination containing a vulnerable acid and the conjugate base of the vulnerable acid, or a vulnerable base and the conjugate acid of the vulnerable base. They withstand a trade-in pH upon dilution or upon the addition of small amounts of acid/alkali to them.

Buffer solutions resist an exchange in pH whilst small amounts of a robust acid or a strong base are added. a solution of acetic acid and sodium acetate CH3COOH + CH3COONa is an example of a buffer that includes a susceptible acid and its salt.

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From the calculations, we can see that the methane gas, oxygen gas and fluorine gas all have the same volume.

Now we know that we could be able to obtain the volume in each case by the use of the idea gas equation. We know that the temperature is  44 °C or 317 K and the pressure is 745 mm Hg or 0.98 atm.

Now;

For methane;

n = 16 g/16 g/mol = 1 mole

V = nRT/P

V = 1 * 0.082 * 317/0.98

= 26.5 L

For oxygen;

n = 32 g/32 g/mol = 1 mole

V = nRT/P

V = 1 * 0.082 * 317/0.98

= 26.5 L

For fluorine;

n = 38 g/38 g/mol = 1 mole

V = nRT/P

V = 1 * 0.082 * 317/0.98

= 26.5 L

Hence, they all occupy the same volume

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Display data associated with the ID such as age and other information.

Glassy unfocused eyes slow speech and movement or difficulty with small motor skills indicate a slow reaction. State ID cards, passports military ID cards, and driver's licenses are acceptable forms of ID in most states. Permanent Resident Cards may be accepted in some areas, but check with your administrator.

When a liquor store has carefully examined the identity of a customer before serving alcoholic beverages and reached a reasonable conclusion. Even if it turns out to be a fake ID and the appearance of the minor suggests the minor may be over the age of 21 or doing things she normally wouldn't. It is legally permissible even if it suggests that it is sexual. This can be a behavioral sign of addiction. Delayed reaction time Your body reacts and acts slower.

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Dissociate is the term which describes the dissolution of solutes in water.

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The density in g/cm³ of an unknown metal alloy sample is 11.784g.

Mass per unit volume is the definition of density for a material. The ratio of mass to volume, or mass per unit volume, is what is meant by density. It gauges the amount of "stuff" contained within an object in relation to its volume (cubic meter or cubic centimeter). The degree to which matter is packed together firmly is fundamentally measured by density. The Greek scholar Archimedes is credited with discovering the principle of density. If you know the formula and are familiar with the relevant units, you can calculate the principle of density with ease. The formula for determining density is to take an object's mass (m) and divide it by its volume (v): = m / v. Density is typically denoted by the Greek symbol "."

The SI unit for density is the kilogram per cubic meter (kg/m3). centimeter (g/cm3).

Mass of clean pycnometer = 25.151 g

Mass of clean pycnometer plus water = 42.481 g

Mass of clean pycnometer plus metal sample = 39.605 g

Mass of clean pycnometer plus metal plus water = 54.265 g

54.265 g - 42.481 g

= 11.784 g

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The negative sign indicators that the reaction is exothermic. the enthalpy change -2257.2 J.

Enthalpy, one of a thermodynamic system's attributes, is determined by multiplying the system's internal energy by the sum of its pressure and volume. The large surrounding environment conveniently offers this state function, which is commonly utilized in measurements of chemical, biological, and physical systems at constant pressure.

In order to calculate the system's physical dimensions, the pressure-volume term specifies the effort required to displace the system's surrounds and make room for it. The pressure-volume term is quite tiny for solids and liquids under ordinary conditions, but only fairly modest for gases. Enthalpy therefore acts as a substitute for energy in chemical systems.

The equation for the reaction is NaOH + HCl [tex]\rightarrow[/tex] NaCl + H₂O

Volume of the solution (100+100) ml = 200ml

Mass of solution = 200ml soln. x 1.00gm/1ml soln. (water density 1g/ml)

                           = 200ml

We, know the rule q=mcp∆t can be used to calculate the enthalpy change
Where q = enthalpy change
m = mass of solution
c = Specific heat of solution
∆t = Change in temperature

∴ m = 200gm soln.
c = 4.18J/g°C (water specific heat)
∆t = (27.2°C - 24.5°C)

∴ q=mcp∆t
= 200gm x 4.18J/g°C x (27.2°C - 24.5°C)
= 2257.2 J

We known that
q reaction = - q solution
                 = (c x m x ∆t) soltuion
∴ q reaction = -2257.2 J

Therefore, the correct answer is -2257.2 J

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The molal saturation of the moist entering air is 10.96 mol, molal saturation of the exiting air at 21 C is 0.560 mol and 187.2g of water condenses in the cooler.

The Antoine equation can be stated as a class of semi-empirical correlations describing the exact relation between vapor pressure and temperature for pure substances.

it is seen that

humidity = 44%

Ptotal = 1 atm = 760 mm Hg

[tex]P_{H2O}[/tex] = RH/100 X [tex]P^{*} _{H2O}[/tex] = 52/100 X 567.09

= 294.88 mmHg

Molal saturation = [tex]\frac{P_{H2O} }{P_{T} -P_{H2O} }[/tex]

= 294.88/ (760 - 294.88)

= 0.6361

Exit air = 100% (after cooling)

[tex]P_{H2O}[/tex] =  [tex]P^{*} _{H2O}[/tex] at 21°C = 18.65

Hm2 = 18.67/ (760 - 18.65)

= 0.025

Mole of water that enters = mole of total moist - mole of total dry

= 33.39 - 22.43

= 10.96

mole of water exits after cooling

n2 = Hm2 x (mole of dry air)

= 0.025 x 22.43

= 0.560

water condenses = n1 - n2

=10.96 - 0.560

=10.4 mol

=10.4 x 18 g

= 187.2 g

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Answer:

Our bodies live and die at a cellular level and the cells must maintain alkalinity in order to function and stay alive. An acidic state causes lack of oxygen at a cellular level. A pH of below 7.4 is sub-optimal providing the perfect environment for bacteria, mold and viruses to grow

Explanation:

2 HCl(aq) + Sr(OH)₂(aq) → SrCl₂(aq) + 2 H₂O(l).

Complete neutralization occurs when strong acids such as hydrochloric acid and HCl are mixed with strong bases such as sodium hydroxide and NaOH. Strong acids and strong bases decompose or completely dissociate into their constituent ions when dissolved in water. When a strong acid reacts with a strong base, the resulting salt is neither acidic nor basic.

Neutral. For example, when HCl hydrochloric acid a strong acid reacts with NaOH a strong base the resulting salts are sodium chloride and water. In a neutralization reaction, an acid reacts with an equimolar amount of base to form salt and water. An example would be the reaction between a strong acid and a base. The sodium chloride formed is the result of the neutralization reaction.

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An unknown substance has a specific heat capacity of 2.22 J/g °C. If 92.3 grams are heated with 1,760.0 joules of energy the change in temperature be will be 360°C

Specific heat is defined by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree celsius (°C)

Here given data is unknown substance

Specific heat capacity means Q =  2.22 J/g °C

Mass = 92.3 grams and

C = 1,760.0 joules and

We have to calculate change in temperature = ?

So the formula is Q = mc×ΔT

2.22 J/g °C = 92.3 ×1,760.0 joules×ΔT

ΔT = 360°C

So the change in temperature be360°C

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Answer: Combustion

Explanation:

Answer:

10.0 g C12H22O11 (mol/342.34 g) (1/0.500 L) = 0.06 M C12H22O11 => 1 sig.

Explanation:

According to molar concentration,0.00876 liter of 0.500 M sucrose contain 1.5 kg of sucrose.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Volume is obtained by using molar concentration formula, 0.500×342.3/1.5×10³=114.1×10[tex]^-3[/tex]=1/V

Thus,volume=1/114.1×10[tex]^-3[/tex]=0.00876 M.

Thus, the volume of sucrose solution is 0.00876 M.

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Answer:

Determining the melting point of a substance.

Answer:

The law of Universal Gravitation.

When an airplane is in flight, the air pressure at the under drops.

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is dispersed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

As air flows over an airplane wing, the form of the wing creates a low pressure over the wing surface. The low pressure creates lift, which allows the plane to fly.

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