If 45.0 mL of ethanol (density =0.789g/mol) initially at 6.0°C mix with 45.0 mL of water (density =1.0 g/mol) initially at 28.0°C in an insulated beaker, what is the final temperature of the mixture, assuming that no heat is lost? (CetOH =2.42 J/G C)

Answer:

Molarity = 0.24 M

Explanation:

Given data:

Number of moles of Mg(NO₃)₂ = 0.181 mol

Volume of solution = 0.750 L

Molarity of solution = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

by putting values,

Molarity = 0.181 mol / 0.750 L

Molarity = 0.24 M

Answer:

I would reccomend LED's because they use much less energy than incandescent bulbs

Answer:

What

Explanation:

Can u explain

Answer:

[tex]435.18\ cm^3[/tex]

Explanation:

[tex]From\ the\ measurements\ by\ the\ caliper,\\The\ length\ of\ the\ cube=6.8\ cm\\The\ breadth\ of\ the\ cube=6.83\ cm\\The\ height\ of\ the\ cube=9.37\ cm\\Hence,\\As\ we\ know\ that\ Volume\ of\ the\ cuboid=lbh\\Hence,\\Volume\ of\ the\ cube=6.8*6.83*9.37\\Volume\ of\ the\ cube=435.18\ cm^3\\[/tex]

Answer:

Option D.

2Ag⁺(aq) + Ni(s) —> 2Ag(s) + Ni²⁺(aq)

Explanation:

From the question given above:

Ni(s) —> Ni²⁺(aq) + 2e¯

Ag⁺(aq) + e¯ —> Ag(s)

We can obtain the net ionic equation by combining both equation as shown below:

Ag⁺(aq) + e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

Next, we shall balance the equation. This can be obtained as follow:

Ag⁺(aq) + e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

There are 2 atoms of e¯ on the right side and 1 atom on the left side. It can be balance by putting 2 in front of e¯ as shown below:

Ag⁺(aq) + 2e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

Next, we shall balance the charge on both sides. This is illustrated below:

TOTAL charge on the left = +1 + (–2)

= 1 – 2

= –1

TOTAL charge on the right side = +2 + (–2)

= 2 – 2

= 0

Thus, to balance the charge, put 2 in front of Ag⁺ as shown below:

2Ag⁺(aq) + 2e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯

There are 2 atoms of Ag on the left side and 1 atom on the right side. It can be balance by putting 2 in front of Ag as shown below:

2Ag⁺(aq) + 2e¯ + Ni(s) —> 2Ag(s) + Ni²⁺(aq) + 2e¯

Next, cancel out 2e¯ from both side to obtain the net ionic equation. Thus, we have:

2Ag⁺(aq) + Ni(s) —> 2Ag(s) + Ni²⁺(aq)

As that liquid water is further heated, it evaporates and becomes a gas—water vapor.

When a liquid transitions from the liquid phase to the gas phase, evaporation, a sort of vaporization, takes place on the liquid's surface. High concentrations of the evaporating substance in the surrounding gas considerably slow down evaporation, as is the case when humidity impacts the rate of water evaporation.

The way that the liquid's molecules clash determines how much energy is transferred to one another. In order to leave and enter the surrounding air as a gas, a molecule close to the surface must absorb enough energy to outperform the vapor pressure. Evaporative cooling is the process of reducing a liquid's temperature as a result of evaporation, which removes energy from the evaporated liquid.

The majority of the liquid's molecules only hold a small portion of the heat energy needed.

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Answer:

Heating water until it boils. The water particles would gain thermal energy from the heat source and there would be an increase in the kinetic energy between the water particles. During this stage, the temperature of the water particles remains the same as the thermal energy is used to break the strong bonds of attraction between the water particles so that they can be further apart and transition from the liquid state to the gas state.

The Molecular formula of the compound is C₂₀H₂₈O₂

The Molecular formula is determined as follows from the equation of the reaction as follows:

CxHyOz + O₂ → x CO₂ + y/z H₂O

mass of CO₂ produced  = 43.257 g

moles of C in the sample = 43.257/44  = 0.983 moles

mass of C in the sample =  0.983 * 12 = 11.796

mass of H₂O produced  = 12.395 g

moles of H in the sample = 12.395/18 * 2 = 1.377 moles

mass of H in sample = 1.377 g

mass of oxygen in the sample = 14.765 g - (11.796 g + 1.377 g)

mass of oxygen in the sample = 1.598

moles of oxygen = 1.598/16 = 0.0999 moles

Ratio of C : H : O = 0.983 : 1.377 : 0.0999

Ratio of C : H : O = 10 : 14 : 1

Empirical formula of compound = C₁₀H₁₄O

Empirical mass = 150 g

Molecular mass = empirical mass * n

n = molecular mass/empirical mass

n = 300.44/150

n = 2

From the formula;

Molecular formula = (empirical formula)ₙ

Molecular formula = (C₁₀H₁₄O)₂

Molecular formula =C₂₀H₂₈O₂

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Answer:

I believe it is a positive quantity such as water has 4.14 j/oC it is always positive it is the energy needed to raise the temperature by 1 degree celsius

Explanation:

89 year old toys girl who have some starter pets plez im new

Answer:

The radius of the atom Ta is 142pm

Explanation:

To solve this question we need to know that for a body-centered cubic lattice we have the equations:

X = 4/√3 R

Where X is edge length and R is radius of the atom in the lattice.

If adge length of unit cell is 328 pm:

328pm = 4/√3 R

328pm * √3 / 4 = R

142pm = R

The radius of the atom Ta is 142pm

Consider a solution containing 10−5 M H2S(aq) and a constant dissolved oxygen concentration of 0.25 mM (8.0 mg/L). If the given reaction is the only way that 100 temperature.

Temperature is a numerical expression of how hot (or energetic) stuff or radiation is.

There are three different types of temperature scales: those, like the SI scale, that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body; those that only depend on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by practical empirical properties of particulates rather than by theoretical principles.

Using a thermometer, one can gauge temperature. It is calibrated using different temperature scales, each of which historically defined itself using a different set of reference points and thermometric materials.

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Answer:

The correct answer is -1946.89 j/K.

Explanation:

The reaction is:

2H2O (l) ⇔ 2H2 (g) + O2(g)

First there is a need to find dHfrxn = dHf(Products) - dHf(reactants)

With the help of standard thermodynamic table, the values of dHf can be obtained,

dHf(H2O) = -285.8 kJ/mol

dHf(H2) = 0 kJ/mol

dHf(O2) = 0 kJ/mol

dHrxn = 2 × dHf (H2) + dHf(O2) - 2 × dHf(H2O)

= 2 × 0 + 0-2 × (-285.8) kJ = +571.6 kJ

This value is for 2 moles of H2O, for 2.03 moles of H2O, the value will be,  

dHrxn = +571.6 kJ/2 mol × 2.03 mol

= 580.174 kJ

The given temperature is 298 K.  

So, the value of dSsurr = -dHrxn/T  

= -580.174kJ/298 K

= -580174 j/298K

= -1946.89 j/K

Aristotle laid the philosophical groundwork for all subsequent discussions of elements, pure substances, and chemical combinations.

The nature of substances and their transformations were the main topics of Aristotle's theories, just like in contemporary chemistry. In On Generation and Corruption (De Generatione et Corruptione), Meteorology, and portions of Physics and On the Heavens, he provided the first systematic treatments of chemical theory (De Caelo).

Although he believed that some of them might be made of a single, pure component, Aristotle realized that the majority of common, tangible things are composed of several different substances. In order to identify a single substance, he needed to provide a purity standard. His standard was the homoeomerism of pure substances, which means that they are made up of similar components at all levels.

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The average atomic mass of the imaginary element : 47.255 amu

The elements in nature have several types of isotopes  

Isotopes are elements that have the same Atomic Number (Proton)  

Atomic mass is the average atomic mass of all its isotopes  

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

isotope E-47 47.011 amu, 87.34%

isotope E-48 48.008 amu, 6.895

isotope E-49 50.009 amu, 5.77%

The average atomic mass :

[tex]\tt avg~mass=0.8734\times 47.011+0.06895\times 48.008+0.0577\times 50.009\\\\avg~mass=41.059+3.310+2.886\\\\avg~mass=47.255~amu[/tex]

Answer:

Current 32 A

Explanation:

Use this formula

I=V/R

V = Voltage (volts)  

R = resistance (ohms)

160/5=32

Hope this helps

Answer:

When  unisotope releases gamma radiation, it does not change the atomic number of the atom .

Explanati

. This is because gamma radiation is the emission of electromagnetic energy from the nucleus in the form of photons, discrete packets of energy.

Answer:

No because a straw is plastic look at it by this was, the energy used to create one metal straw is roughly equivalent to creating 90 plastic straws, and also produces carbon emissions equivalent to 150 plastic straws. This may not seem like a lot, but in order to offset the environmental impact of creating a metal straw, it must be used over 150 times

Explanation:

Answer:

The products are SnPO4 and LiC2H3O2

Explanation:

The reactants are LiPO4 + Sn(C2H3O2)2

This is a double replacement reaction

So what you do is switch the elements the other way around.

To do that, all you have to do switch Sn with PO4 since Sn is a cation and PO4 is an anion.

Then you switch Li with C2H3O2 because Li is a cation and C2H3O2 is an anion.

After that, check the charges. PO4 has -3 charge

So just leave Sn the way it is without a subscript.

In word form, the product would be Tin(III) Phosphate

C2H3O2 has a -1 charge Li has a +1 charge

So leave both of them the way it is without any subscripts.

In word form, the product would be Lithium Acetate

Answer:

Bears

Explanation:

because starch is heavy and it requires a lot of oxygen in an environment. so having starch in an environment with less oxygen could probably cause fatigue

Explanation:

it b

....

hope it helps!

Answer:

Radiation, because the element of the heater comes in contact with air in the room. Convection, because energy is carried by waves and not matter. Radiation, because heat travels in a cyclical manner.

Explanation:

Answer:

Radiation,

Explanation:

Multiply the no. of moles with Avogadro's constant which is 6.02*10^23

the mole ratio of Zinc * Avogadro's constant *8.67*1018

this should help you get what you want

Answer:

from

H=mc∆T

where by;

H is amount of heat.

m is mass of water.

c is specific heat of water.

∆T is change in temperature.

m=density ×volume

m=1.00g/ml×45.7ml

m=45.7g

∆T=Tt-T°

∆T=41.3°C-23.6°C

∆T=17.7°C

H=45.7g×4.184j(g•°C)×17.7°C

H=3,384.396J

H=3,384.396÷1000

H=3.384kJ

Explanation:

H=mc∆T

where by;

H is amount of heat.

m is mass of water.

c is specific heat of water.

∆T is change in temperature

If you traded (converted) 15 Skittles for M&Ms, you will have 20 M&Ms

We'll begin by converting 15 Skittles to cookies. This can be obtained as follow:

6 Skittles = 4 Cookies

Therefore,

15 Skittles = (15 Skittles × 4 cookies) / 6 skittles

15 Skittles = 10 cookies

We can convert 10 cookies to M&Ms as follow:

1 Cookies = 2 M&Ms

Therefore,

10 cookies = (10 cookies × 2 M&Ms) / 1 Cookies

10 cookies = 20 M&Ms

Thus, 15 Skittles is equivalent to 20 M&Ms

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The final concentration will be "0.167 M".

According to the question,

Moles of KCl,

Moles of K₂SO₄,

Total moles of K+ will be:

= [tex]0.15\times 200\times 10^{-3}+2\times 0.1\times 100\times 10^{-3}[/tex]

Total volume will be:

= [tex](100+200) \ mL[/tex]

hence,

→ The final concentration of K+ will be:

= [tex]\frac{Total \ moles}{Total \ volume}[/tex]

= [tex]\frac{0.05}{300}\times 100[/tex]

= [tex]\frac{0.5}{3}[/tex]

= [tex]0.167 \ M[/tex]

Thus the above solution is correct.

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Answer:

170

Explanation:

C=6×12=72

H=12×1 = 12

O=6×16=96

Molar mass=72+12+96

Molar mass=170

Answer:

180

Explanation:

C = 12

H = 1

O = 16

The molar mass of the glucose is

⇒ 12 x 6 + 1 x 12 + 16 x 6

⇒ 72 + 12 + 96

= 180

Answer:

In the explanation

Explanation:

Divergent: When two plates are diverging from each other, meaning that the two plates are moving away from each other. Events that may occur include ridges or rifts.

Convergent: When two plates are moving towards each other.

If a continental plate and an oceanic plate are converging, the oceanic plate would slide underneath the continental plate since it is thinner. This would result in subduction, which means that part of the oceanic plate would hang underneath the continental plate, where magma can melt the hanging part.

If two continental plates are converging, the crash would result in mountains or volcanic activity. Magma could rise and rush from the crack. There would be a bump in these tectonic plates.

Transform: When two plates are sliding past each other. Earthquakes can occur when the plates are sliding. When an oceanic plate is involved, the movement of the plates could cause a tsunami as well. The water above the transform fault could rise, and grow bigger and bigger. The 2011 Japan Tsunami is a good example of this.

Hope this helps!

Answer:

Communicate the final solution

This concludes the Technological Design Process.

Answer:

Explanation:

The mass of the football can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{600}{30} = \frac{60}{3} \\ [/tex]

We have the final answer as

Hope this helps you