Can someone explain how to do this?

1. 0.33 M

2. 0.278 M

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

1. 0.350 mol of NaOH in 1.05 L of solution.

n=0.35

V=1.05 L

Molarity :

[tex]\tt M=\dfrac{0.35}{1.05}=0.33[/tex]

2. 14.3 g of NaCl in 879 mL of solution.

mol NaCl(MW=58.5 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{14.3~g}{58.5~g/mol}=0.244[/tex]

Molarity :

[tex]\tt M=\dfrac{0.244}{0.879~L}\\\\M=0.278[/tex]

Answer:

(d) catapleurotic

Explanation:

Phosphoenolpyruvate carbokinase (PEPCK) is usually used in the conversion of oxaloacetate to phosphoenolpyruvate (an important intermediate in glycolysis and gluconeogenesis, C₃H₅O₆P). The main function of this catapleurotic enzymes is in the catalysis of the forward conversion of oxaloacetate to phosphoenolpyruvate.

There are 5.43 x 10²³ present in  187 grams of XeF₄

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\tt n(mol)=\dfrac{mass(m)}{MW}[/tex]

mass of XeF₄ = 187 g

mol XeF₄ (MW=207,2836 g/mol) :

[tex]\tt mol=\dfrac{187}{207,2836 g/mol}=0.902[/tex]

Number of molecules :

[tex]\tt N=0.902\times 6.02\times 10^{23}\\\\N=5.43\times 10^{23}[/tex]

Answer:rrrrrrrrrrrrrrrrrrr

Explanation:

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Answer:

6.1 atm

General Formulas and Concepts:

Chemistry - Gas Laws

Combined Gas Law: PV = nRT

Temperature Conversion: K = °C + 273.15

Explanation:

Step 1: Define

n = 2.5 mol N₂

V = 10.0 L

T = 25 °C = 298.15 K

Step 2: Find Pressure P

Step 3: Check

We are given 2 sig figs as our lowest. Follow sig figs and round.

6.11953 atm ≈ 6.1 atm

Answer:

16.86%

Explanation:

Na3N is sodium nitride.

% of N = mass of N/ molar mass of Na3N *100

% of N = 14/83*100= 16.86%

The percent composition of nitrogen in sodium nitride is 16.86%

Sodium nitride is an inorganic compound that is used in preservatives and antidote for cyanide poisoning.

The molar mass of Na3N is 83 M

The mass of Na3N is 14 g

[tex]% \;of \;N = \dfrac{mass of N}{ molar mass of Na3N } \times 100[/tex]

[tex]\% \;of \;N = \dfrac{mass\; of \;N}{molar\; mass\; of\; Na3N} \times 100\\\\\\\% \;of \;N = \dfrac{14}{83} \times 100 = 16.86\%[/tex]

Thus, the  percent composition of nitrogen in sodium nitride is 16.86%.

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Answer:

Explanation:

One that forms over the Indian Ocean is called a maritime tropical air mass and is warm and humid. Air masses are classified on weather maps using two or three letters. A lowercase letter describes the amount of moisture in the air mass: m for maritime (moist) and c for continental (dry).

The letter 'c' of an air mass represents moisture content.

An air mass can be described as a volume of air defined by its humidity and temperature. Air masses are classified depending on latitude and their continental or maritime source regions. Warmer air masses are deemed tropical while Colder air masses are termed polar or arctic.

The maritime and monsoon air masses are moist while Continental and superior air masses are dry. When an air mass will move away from its source region, water bodies and underlying vegetation can quickly modify its character.

The first letter "c" represents its moisture properties in continental air masses (dry) while "m" represents maritime air masses. The letter "T" stands for Tropical, "A" stands for Arctic or Antarctic,  "E" stands for Equatorial, "P" stands for Polar, "M" stands for monsoon, and "S" stands for adiabatically drying and warming air.

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Answer:

Following are the solution to the given points:

Explanation:

In point a, the answer is only ions because of [tex]NH_4Cl[/tex] has a strong electrolyte.

In point b, the answer is the only molecules because of ethanol [tex]CH_3CH_2OH[/tex], it has a nonelectrolyte.

In point c, the answer is the few ions because of hydrocyanic acid HCN, which has a weak electrolyte.

(a) Only ions.

(b) Only Molecules.

(c) Few ions.

(a) In this, only ions should be considered as it contains strong electrolyte.

(b) In this, only molecules should be considered as it contains non-electrolyte.

(c) In this, few ions should be considered due to hydrocyanic acid HCN, that contains weak electrolyte.

Therefore we can conclude that

(a) Only ions.

(b) Only Molecules.

(c) Few ions.

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Response:

Sorry but I think you forgot to attach or include something, thanks for the points tho!

Other:

Brainliest? Thanks!

Answer:

3. 39 39 54

Explanation:

Atoms are the smallest units of matter that have the characteristics of a chemical element. They consist of small particles called protons, electrons, and neutrons.

Protons are positively charged particles that make up the nucleus of the atom along with neutrons, neutrally charged particles. Their mass is almost the same - about 1 AMU (atomic mass unit). Electrons, the negatively charged particles, are much lighter than them and don't significantly contribute to the mass of the atom. Their mass is equal to about 1/2000 of the mass of a proton or neutron.

This is why we need to determine which atom out of the ones you were given has the highest number of protons and neutrons. The first has 91, the second 90, the third 93, and the fourth 91. This means that the third atom has the highest mass.

Answer:

Explanation:

because Ca is of second group they have low ionization energy when react with chlorine they have more ionic character than other in given options

Answer:

It is a chemical reaction in which the reactants form products and products react together to give reactants back. That means reversible reactions can go in both directions forward as well as backward direction.

Answer:

A

Explanation:

Combustion reactions always produce  water and CO2

The products for the combustion have been water and carbon dioxide along with the liberation of heat. Thus, option A is correct.

Combustion can be defined as the process of burning carbon-based compounds in the presence of oxygen. Combustion has been the process that liberates heat energy.

The combustion can be given as:

Hydrocarbon [tex]\rightarrow[/tex] Carbon dioxide + Water + Heat

The products for the combustion have been water and carbon dioxide along with the liberation of heat. Thus, option A is correct.

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Answer:

C

Explanation:

I hope that helps!!! it kinda gave you the answer though

Answer:

7-METHYL-4-OCTANONE 7-methyloctan-4-one 20809-46-5 4-Octanone, 7-methyl- 7-methyl-octan-4-one More...

Explanation:

We can  effectively that the correct equation of the reaction is correctly written as ((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol)) - (1 mol)(-1,273.02 kJ/mol).

The heat of reaction is the heat that could be absorbed or evolved in a reaction. We know that a reaction could be an exothermic or an endothermic reaction. In an exothermic reaction, energy is given out while an endothermic reaction is one in which heat is absorbed.

Having said this, we know that the reaction is a combustion reaction. Heat is always given out in a combustion reaction thus we know that the process is exothermic and the sign of the heat of reaction is negative.

Let us now look at the reaction as shown, we can see that it involves the combustion or burning of glucose in oxygen. We now seek to obtain the correct equation for the combustion reaction.

Thus, we can now write effectively that the correct equation of the reaction is correctly written as ((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol)) - (1 mol)(-1,273.02 kJ/mol).

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Answer:

names of 10 metallic minerals are Silver, Chromium, Tin, Nickel, Copper, Iron, Lead, Aluminum, Gold, and Zinc.

Explanation:

Answer:

B. Nucleus

A. Orbitals

Explanation:

Ed22

The region of the atom where protons and neutrons are located (B) is called the nucleus.

The region of the atom where electrons are located (A) is called orbits.

In an atom, the nucleus is the central core that contains protons and neutrons. It is a tiny, dense region located at the center of the atom. Protons have a positive charge, while neutrons are electrically neutral (have no charge). The number of protons in the nucleus determines the element's identity.

Orbits (also called electron shells or energy levels) are the regions around the nucleus where electrons are found. Electrons are negatively charged particles that move within these orbits. Each orbit has a specific energy level, and electrons closer to the nucleus have lower energy levels. Electrons occupy the lowest available energy levels first before moving to higher levels as the atom gains more electrons.

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The complete question is shown in the image attached below -

Answer:

symbol is Al

Explanation:

aluminum is that element

please mark me brainliest

Answer:

83.98 g/mol

Explanation:

To find the molar mass of AlF₃, you need to add the individual molar masses of each element times their quantities. For instance, since there are 3 fluorine atoms in AlF₃, the molar mass of AlF₃ must include the molar mass of fluorine times 3.

Molar Mass (Al): 26.98 g/mol

Molar Mass (F): 19.00 g/mol

Molar Mass (AlF₃): 26.98 g/mol + 3(19.00 g/mol)

Molar Mass (AlF₃): 83.98 g/mol

Answer:

Noble Gases

Explanation:

Noble gases are very unreactive because they already have a full valence shell and therefore, do not need to bond.

Answer:

Noble gases

Explanation:

Answer:

The levels of carbon dioxide (CO2) in the atmosphere are reduced

Explanation:

Tectonic uplift refers to the process by which the surface of the earth slowly rises either due to increasing upward force applied from the plates below the surface or decreasing downward force or weight of objects like melting glaciers acting from above. During uplift, land, as well as the sea floor rises forming mountains, plateaus and volcanic Islands.

During the process of weathering, carbon dioxide present in air combines with rainwater and forms carbonic acid. This acidic rainwater then falls on uplifted mountains and rocks weathering them in the process. Minerals present in the rock such as calcium, magnesium and sodium then combine with bicarbonate ions to form carbonates such as calcium carbonate, magnesium carbonate which are found in shells of living and dead organisms and also form rocks such as limestone. In this way, carbon dioxide is removed from the atmosphere.

The energy produced : -32.89 kJ

Delta H reaction (ΔH) is the amount of heat / heat change between the system and its environment

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)

The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol.

For 0.8210 g of naphthalene :

mol =

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{0.8210}{128.17}=0.0064[/tex]

The energy produced :

[tex]\tt Q=\Delta H\times n(mol)\\\\Q=-5139.6\times 0.0064=-32.89~kJ[/tex]

Answer:

Its the first one. The cells are arranged for structure.

Explanation:

Animal cells do not need to maintain a shape since out bodies do it for us. Plant cells need something for structure.

The energy produced by burning : -32.92 kJ

Delta H reaction (ΔH) is the amount of heat change between the system and its environment

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)

The enthalpy and heat(energy) can be formulated :

[tex]\tt \Delta H=\dfrac{Q}{n}\rightarrow n=mol[/tex]

The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol.

The energy released for 0.8210 g of naphthalene :

[tex]\tt Q=\Delta H\times n\\\\Q=-5139.6~kJ/mol\times \dfrac{0.8210~g}{128.17~g/mol}~\\\\Q=-32.92~kJ[/tex]

Answer:

Me gusta el triángulo, la respuesta es triángulo.

Explanation: