Please help this is a big grade please

Answer:

[tex]\Delta S_{source}>-1.204\frac{kJ}{K}[/tex]

Explanation:

Hello!

In this case, given the initial conditions, we first use the 10-% quality to compute the initial entropy:

[tex]s_1=s_{f,175kPa}+q*s_{fg,175kPa}\\\\s_1=1.4850\frac{kJ}{kg*K} +0.1*5.6865\frac{kJ}{kg*K}=2.0537\frac{kJ}{kg*K}[/tex]

Now the entropy at the final state given the new 40-% quality:

[tex]s_2=s_{f,150kPa}+q*s_{fg,150kPa}\\\\s_2=1.4337\frac{kJ}{kg*K} +0.4*5.7894\frac{kJ}{kg*K}=3.7495\frac{kJ}{kg*K}[/tex]

Next step is to compute the mass of steam given the specific volume of steam at 175 kPa and the 10% quality:

[tex]m_1=\frac{0.028m^3}{(0.001057+0.1*1.002643)\frac{m^3}{kg} } =0.274kg\\\\m_2=\frac{0.028m^3}{(0.001053+0.4*1.158347)\frac{m^3}{kg} } =0.0603kg[/tex]

Then, we can write the entropy balance:

[tex]\Delta S_{source}+\frac{Q}{T_1} -\frac{Q}{T_2} +s_2m_2-s_1m_1-s_{fg}(m_2-m_1)>0[/tex]

Whereas sfg stands for the entropy of the leaving steam to hold the pressure at 150 kPa and must be greater than 0; thus we plug in:

Which is such minimum entropy change of the heat-supplying source.

Best regards!

Answer:

Drowned

Explanation:

We can use drown here, that sounds appropriate.

Answer:

Yes

Explanation:

All elements and compounds are regarded as pure substances. Whereas mixtures are classified as impure substances.

The characteristics of pure substances are:

These characteristics perfectly fits those of elements and compounds.

Answer:

Dinitrogen trioxide.

Explanation:

The correct name for the compound [tex]N_2O_3[/tex] is dinitrogen trioxide. The compound [tex]N_2O_3[/tex] also happens to be a covalent compound, and the nomenclature of covalent compounds involves the usage of numerical prefixes such as "mono-" and "tri-".

Since there are two nitrogen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "di-", meaning two, to signify that.

Since there are three oxygen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "tri-", meaning three, to signify that.

Answer:

A. The energy of moving particles near a fire

Explanation:

Remember: energy is conserved in a chemical reaction (visualize the reaction and question whether heat lies on reactant side (left) or product side (right))

-exothermic- heat is released (heat is on the product side)

>forming an ionic lattice (SALT)- mixture of Na and Cl results in a more stable ionic lattice, causing this reaction to be exothermic

>burning wood

-endothermic- heat is absorbed (heat is on the reactant side)

> cooking an egg

Explanation:

Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements. Boron is electron-deficient, possessing a vacant p-orbital. ... It reacts with metals to form borides. At standard temperatures boron is a poor electrical conductor but is a good conductor at high temperatures

Answer:

C). Ball B transfers energy to Ball A

Explanation:

The motion of ball A is a because of the energy it acquires.

Ball A initially due to its position posses potential energy due to its position.

The moving ball B has kinetic energy due to the motion of this ball.

Answer:

c

Explanation:

Explanation:

If a body reflects only a/few color/s of the visible spectrum by absorbing remaining, it appears in that reflected color/s. In case of water, its tri-atomic (2 atoms of hydrogen and one atom of oxygen) structure does not absorb any colors from the visible spectrum of the light. ... Hence water appears colorless while others do absorb

Due to presence of paired electron in K3[Al(C2O4)3.3H2O , it will show colorless.

Paired electrons would be those in an atom which occur in pairs in an orbital, while un-paired electrons would be those in an atom that occur alone in an orbital.

Such metals were transition elements, meaning their compounds include un-paired electrons. These un-paired electrons easily create excited energy states, allowing photons to be absorbed and color to be produced.

Therefore, due to the presence of paired electrons complex will be colorless.

To know more about paired electron.

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Answer:

7.38 Liters

Explanation:

moles CO2 = 14.5g/44g/mol = 0.33 mole

At STP 1 mole of any gas occupies 22.4 Liters.

∴0.33 mole CO2 x 22.4 L/mol = 7.38 Liters

Answer:

Kp = P (N₂) . P³ (H₂)  /  P² (NH₃)

Explanation:

The reaction for the decomposition of ammonia is given by;

2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)

The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.

The pressures of the species are raised to the powers of their respective coefficients.

In this reaction;

Products =  N₂ (g) + 3H₂ (g)

Reactant = 2 NH₃ (g)

The pressure equilibrium constant (Kp) is given as;

Kp = P (N₂) . P³ (H₂)  /  P² (NH₃)

Answer:

A magnesium atom must lose two electrons to have the same number electrons as an atom of the previous noble gas, neon. Thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2+. The symbol for the ion is Mg2+, and it is called a magnesium ion.

Explanation:

When Sulphuric acid is slowly poured into water in a beaker the beaker becomes hot and this is exothermic reaction

when ammonium chloride is dissolved in water in a beaker the beaker becomes cold and this is endothermic reaction

An example of an exothermic reaction is rusting or iron, nuclear fission. Examples of endothermic reactions are the melting of liquid and the evaporation of water.

A chemical reaction is a process in which one or two substances or compounds, called reactants, react or get mixed with each other and form a totally new compound called a product.

Exothermic reactions are those in which energy is released into the environment after the reaction. The reactant has more energy than the products.

Endothermic reactions are those in which energy is absorbed from the environment. The product has more energy than the reactants.

Thus, rusting on iron or nuclear fission are two examples of exothermic reactions. Liquid melting and water evaporation are two instances of endothermic processes.

To learn more about a chemical reaction, refer to the below link:

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Answer:

1.3×10²³ formula unit

Explanation:

Given data:

Mass of CaCl₂ = 23.8 g

Number of formula unit = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 23.8 g/110.98 g/mol

Number of moles = 0.21 mol

1 mole of any substance contain 6.022×10²³ formula unit

0.21 mol × 6.022×10²³ formula unit / 1mol

1.3×10²³ formula unit

441 g CaCO₃ would have to be decomposed to produce 247 g of CaO

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

mass CaO = 247 g

mol of CaO(MW=56 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{247}{56}\\\\mol=4.41[/tex]

From equation, mol ratio CaCO₃ : CaO = 1 : 1, so mol CaO :

[tex]\tt \dfrac{1}{1}\times 4.41=4.41[/tex]

mass CaCO₃(MW=100 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=4.41\times 100\\\\mass=441~g[/tex]

Answer:

Volume required = 0.327 L

Explanation:

Given data:

Volume in L = ?

Molarity of solution = 1.772 M

Mass of BaCl₂ = 123 g

Solution:

First of all we will calculate the number of moles of BaCl₂,

Number of moles = mass/molar mass

Number of moles = 123 g/ 208.23 g/mol

Number of moles = 0.58 mol

Now, given problem will solve by using molarity formula.

Molarity = number of moles / volume in L

1.772 M = 0.58 mol / Volume in L

Volume in L = 0.58 mol  / 1.772 M

Volume in L = 0.327 L

Answer:

Hydronium ion is the conjugate acid of water.

Exaplination:Acetic acid is the conjugate acid of acetate ion. Hydronium ion is the conjugate acid of water.

Answer:

NH4NO2.

Explanation:

Hello!

In this case, since the by-mass percent of any element (in this case nitrogen) is computed by:

[tex]\%N=\frac{n_N*m_N}{M}*100\%[/tex]

Whereas n is the number of N in the compound, m the atomic mass of nitrogen (14.01 g/mol) and M the molar mass of the compound. Thus, down below we can find the molar mass of each compound and the by-mass percent of nitrogen:

NH4NH2CO2  = 78.07 g/mol

[tex]\%N=\frac{2*14.01}{78.07}*100\%=35.9\%[/tex]

NH4NO2  = 64.06 g/mol

[tex]\%N=\frac{2*14.01}{64.06}*100\%=43.7\%[/tex]

N2O3  = 76.01 g/mol

[tex]\%N=\frac{2*14.01}{76.01}*100\%=36.9\%[/tex]

NH4Cl  = 53.49 g/mol

[tex]\%N=\frac{1*14.01}{53.49}*100\%=26.2\%[/tex]

NH2OH = 33.03 g/mol

[tex]\%N=\frac{1*14.01}{33.03}*100\%=42.4\%[/tex]

In such a way, the compound with the highest percentage of nitrogen by mass is NH4NO2.

Best regards!

Answer:

NH4NO2

Explanation:

The answer is the 2ndone

NH4NO2

Answer:

A. 2

Explanation:

A particle of water is made up of two hydrogen atoms and one oxygen atom. However, the question asked for how many types of atoms there are, so the answer is 2.

Answer: 0.034354

Explanation:1 mole=22.4 liters of Br2 at STP so, 22.4x=0.77

x= 0.034354

Answer:

0.034354

Explanation:

Just did worksheet

Look at the mole ratio in the balanced equation

2CO + O2 ==> 2CO2

3.44 mol O2 x 2 mol CO/mol O2 = 6.88 moles CO

Answer:

SUPER MARIOLWEJHRTÑWQEGTPWIQETGQWKÑEJGBKSDLJBGKSJDLGB

Explanation:

Answer:

Salt!!!

Explanation:

Answer:

25% or 0.25 or 1/4

Explanation:

don't know which form you need so here you have all 3

good luck :)

Answer: mark as Brainliest

10 moles

Explanation:

moles=mass/molar mass, therefore 403.1/(24.31+16)=10

Answer:

10 moles

Explanation:

moles=mass/molar mass, therefore 403.1/(24.31+16)=10

Answer:

There are  

4.517

⋅

10

23

atoms of Zn in 0.750 mols of Zn.

Explanation:

Since we know that there are  

6.022

⋅

10

23

atoms in every mole of a substance (Avogadro's Number), there are  

6.022

E

23

⋅

0.750

atoms of Zn in 0.750 mols of Zn.

Answer:

There are  4.517 ⋅ 10  23 atoms of Zn in 0.750 mols of Zn. have a good day:)

Explanation:

Answer:

1. molecules.

2. size ,shape and mass.

A.ketone

R-CO-R

B.aldehyde

R-CH=O

c.carboxylic acid

R-COOH

d.ester

R-CO-O-C-R

Answer:

yes its c

Explanation: