11A) As electrical energy is converted into heat energy, the total amount of energy in the system
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To Find :

How many moles of air are there in a 125 mL Erlenmeyer flask if the pressure is 755  mm Hg and the temperature is 20.0°C .

Solution :

Since, air contains different gas in different proportion.

Its average molar mass is considered to be 29 gram/mol .

Now, we know by ideal gas equation :

[tex]PV = nRT\\\\n = \dfrac{PV}{RT}[/tex]

Here, R is ideal gas equation, [tex]R = 62.363\ mm\ Hg\ L \ mol^{-1} \ K^{-1}[/tex]

Putting all given values we get :

[tex]n = \dfrac{755 \times 0.125}{62.363\times (20+273)}\ moles\\\\n = 0.00516 \ moles[/tex]

Hence, this is the required solution.

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Explanation:

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Answer:

.-.

Explanation:

Answer:

14 moles of O₂

Explanation:

The reaction between CO and O₂ is the following:

CO + O₂ → CO₂

We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:

2CO + O₂ → 2CO₂

As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:

28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂

Answer:

Radio waves were first developed in WWII

Explanation:

Mark me Brainliest?

Answer:

vinegar, soft drinks, seltzer water , citrus fruits

Explanation:

Answer:

True

Explanation:

Fungi reproduce by spawning absurd amount of spores greatly increasing the survival rate of the fungi.

Answer:

true

Explanation:

Answer:

YUNG PANGATLO LETER D.

Explanation:

YUN ANG SAGUT :>

Answer:

C. Scientific method

Explanation:

we did this in my middle school and this was the only method we were allowed to use to solve problems or questions we had.

Answer:

and earthquake epicenters are related to tectonic plate boundaries. causes Earth's plates to move. Most volcanoes and earthquakes are caused by the motion and interaction of Earth's plates. The way Earth's plates interact at boundaries is an important factor in the locations of earthquakes and volcanoes

Explanation:

Answer:

Land-use change: Humans may destroy natural landscapes as they mine resources and urbanize areas. This is detrimental, as it displaces residing species, reducing available habitats and food sources. ... This can negatively effect an ecosystem because the introduced species may outcompete native organisms and displace them.

Explanation:

Answer:

A-Metals

Explanation:

because they have valence electrons

Answer:

drying up

agricultural chemicals

Explanation:

Answer:

The correct answer is A

Explanation:

Endothermic is a reaction of which heat is provided to break down the reacted molecules

Answer:

Rubbing the match against a rough surface

The activation energy is provided by friction between surfaces

Explanation:

Activation energy is the energy required to start a chemical reaction. It is the minimum energy that must be supplied for a reaction to proceed.

When we strike a match against a rough surface, what we are trying to do is to supply the required activation energy in the form of friction in order to get the combustion reaction started.

Hence, the activation energy for the combustion of a match head is supplied by friction when the match head is struck against a rough surface.

Answer:

132.53 J/kg.°C

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = amount of heat, c = specific heat capacity of platinum metal, m = mass of platinum metal, t₁ = initial temperature, t₂ = Final temperature.

Make c the subeject of the equation

c = Q/m(t₂-t₁).............. Equation 2

From the question,

Given: Q = 5.7 J. m = 18.7 g = 0.0187 kg, t₁ = 21.2°C, t₂ = 23.5°C

Substitute these values into equation 2

c = 5.7/[0.0187×(23.5-21.2)]

c = 5.7/0.04301

c = 132.53 J/kg.°C

Answer:

0.474 moles

Explanation:

divide 10.62 by 22.4.

Answer:

Explanation:

When gas changes to liquid, it releases the thermal energy that has been absorbed before to become gas which does not alter the temperature at all. A reduction in energy changes the arrangement of particle. There spacing between the particles also increases but not as in a gaseous state and so does the kinetic energy. The particles now are now arranged in irregular pattern.

Explanation:

both b and c since it can be both

Answer:

Fossil fuel

Explanation:

Answer:

2

Explanation:

Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs.

Answer:

Explanationconvection

:

In calorimetry, energy is measured through heat transfer from one substance to another. Convection is not the method of heat transfer.

A calorimeter is a device used to measure the amount of heat involved in a chemical or physical process.

For example, when an exothermic reaction occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature.

One technique we can use to measure the amount of heat involved in a chemical or physical process is known as calorimetry.

Calorimetry is used to measure amounts of heat transferred to or from a substance.

To do so, the heat is exchanged with a calibrated object (calorimeter).

Heat loss due to conduction is prevented by placing the calorimeter box in a well-lagged vessel using wool or cork material.

Heat loss due to convection is prevented by placing a lid on the box.

Heat loss due to radiation is minimized by polishing the box in order to smoothen it.

Learn more about calorimeter here:

https://brainly.com/question/16662844

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Answer:

OB

Explanation:

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Answer:

The new temperature of the nitrogen gas is 516.8 K or 243.8 C.

Explanation:

Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

Where P = pressure, T = temperature, K = Constant

You want to study two different states, an initial state and a final state. You have a gas that is at a pressure P1 and at a temperature T1 at the beginning of the experiment. By varying the temperature to a new value T2, then the pressure will change to P2, and the following will be fulfilled:

[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{2 atm}{323 K} =\frac{3.2 atm}{T2}[/tex]

Solving:

[tex]T2*\frac{2 atm}{323 K} =3.2 atm[/tex]

[tex]T2=3.2 atm*\frac{323 K}{2 atm}[/tex]

T2= 516.8 K= 243.8 C

The new temperature of the nitrogen gas is 516.8 K or 243.8 C.

Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.

Answer:

A climate change

Explanation:

the surrounding area would be effected in all ways imaginable, such as change in air, soil, water, plants, animals. and if you eat those said animals those harmful things can transfur into you

17 × ( 2 × 16 ) = 17 × 32 = 544 grams

___________________________

I believe that the answer is A.

The combination of potassium (K) and oxygen (O2) produces K2O (potassium oxide). The balanced equation is 2K + O2 ==> K2O.

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