How many moles of NaCl are found in 5.2L of a 0.75 M solution?

Answer:

There are 5.30*10²⁴ atoms in 8.80 moles magnesium chloride.

Explanation:

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 1 mole of magnesium chloride contains 6.023*10²³ atoms, 8.80 moles of magnesium chloride contain how many moles of atoms?

[tex]amount of atoms=\frac{8.80 moles* 6.023*10^{23} atoms }{1 mole}[/tex]

amount of atoms= 5.30*10²⁴

There are 5.30*10²⁴ atoms in 8.80 moles magnesium chloride.

Answer:

The answer is C

Explanation:

Answer:

See explanation

Explanation:

Nicotine is a covalent molecule. Recall that covalent molecules are not soluble in water and do not have any kind of ionic interaction.

Let us recall that nicotine contains a nitrogen atom having a lone pair of electrons. When nicotine reacts with HCl, this lone pair is protonated to form the ionic compound called nicotine hydrochloride.

C₁₀H₁₄N₂ + HCl --------> C₁₀H15N₂Cl

Answer:

yes it is already balanced

just a tricky question!!

Explanation:

Explanation:

these are the formula that u need to know

1. moles= concentrate × volume

2. moles = mass / mr

3. moles = volume in dm3 / 24dm^3

4. moles = Pressure in pa × Volume in m3 / 8.031 × temperature in K

hope this helps :)

Answer:

1.83 atm

Explanation:

Total pressure is the sum of partial pressures, so the pressure of hydrogen and pressure of oxygen add to equal 4.53 atm

4.53 = 2.7 + Po

Po = 4.53 - 2.7 = 1.83 atm

Answer:

The charge will tell you if the atom is neutral, positive, or negative. "The charge of an atom is the number of protons minus the number of electrons."

i find the answer in (Limiting Reactants and Excess ws_KEY.pdf)  

make a search for it it's the first link

According to stoichiometry and balanced chemical equation, 6.18 moles of hydrogen are formed and HBr is the limiting reactant.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is used in balancing chemical equations.

In the given chemical reaction,when 3.22 moles of Al reacts with 4.96 moles of HBr₃ total of 3.22+4.96= 8.18 moles are formed.Out of which according to reaction of  which 6 moles are of hydrogen so thus,to find moles of hydrogen formed 8.18-2=6.18 moles of hydrogen are formed.

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Answer:

0.01 faraday

Explanation:

We'll begin by writing the balanced equation. This is illustrated below:

CaCl₂ (aq) —> Ca²⁺ (aq) + 2Cl¯ (aq)

Ca²⁺ (aq) + 2e —> Ca

Molar mass of Ca = 40 g/mol

Mass of Ca from the balanced equation = 1 × 40 = 40 g

1 mole of electron (e) = 1 faraday

2 moles of electrons (e) = 2 × 1 faraday

2 moles of electrons (e) = 2 faraday

From the balanced equation above,

40 g of Ca was deposited by 2 faraday.

Therefore, 0.2 g of Ca will be deposited by = (0.2 × 2)/40 = 0.01 faraday.

Thus, 0.01 faraday is needed for the reaction.

Answer:

[tex]\Delta G_{rxn}=51.0kJ/mol[/tex]

Explanation:

Hello there!

In this case, according to the definition of the Gibbs free energy of reaction in terms of the Gibbs free energy of formation of the involved reactants and products, it is possible for us to compute it as shown below:

[tex]\Delta G_{rxn}=3\Delta _f G_{NO_2}+\Delta _f G_{H_2O}-2\Delta _f G_{HNO_3}-\Delta _f G_{NO}[/tex]

Thus, by plugging in the given data, it is possible to obtain:

[tex]\Delta G_{rxn}=3(51.3)+(-237.1)-2(-110.9)-(87.6)\\\\\Delta G_{rxn}=51.0kJ/mol[/tex]

Best regards!

The standard Gibbs free energy change (ΔG°rxn) for the reaction is 76.7 kJ/mol.

The balanced equation for the reaction is:

2 HNO₃(aq) + NO(g) → 3 NO₂(g) + H₂O(l)

The standard free energy change for a reaction ( ΔG0rxn) can be found out using the equation,

ΔG° = Σ ΔG°fproducts - Σ ΔGf° ​​​​​reactants

ΔG°rxn = ΔH°rxn - TΔS0rxn  

∆H°rxn = change in enthalpy of reaction

∆S° = Change in entropy of reaction

T = Temperature ( 298 K )

ΔG°rxn = (3 × ΔG°f(NO₂(g)) + ΔG°f(H₂O(l))) - (2 × ΔG°f(HNO₃)aq)) + ΔG°f(NO(g)))

Substituting the given ΔG°f values:

ΔG°rxn = (3 × 51.3 kJ/mol) + (-237.1 kJ/mol) - (2 × (-110.9 kJ/mol)) + (87.6 kJ/mol)

ΔG°rxn = 153.9 kJ/mol - 237.1 kJ/mol + 221.8 kJ/mol + 87.6 kJ/mol

ΔG°rxn = 226.2 kJ/mol - 149.5 kJ/mol

ΔG°rxn = 76.7 kJ/mol

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Answer:

california

Explanation:

Answer: 0.0129

Explanation:

Answer:

1 1

5 2

6 1

8 3

10 3

6 3

9 3

13 3

Explanation:

First of you add the subscripts (the little numbers after the letters) and multiply the big numbers before the letters together to get the number of atoms

For Example:

O= 1 atom

Si{2}= 2 atoms

Mg{5}C{6}= 11 atoms

3Na{2}= 6 atoms

O(SiNa){2}= OSi{2}Na{2}= 5 atoms

Each Capital letter is a new Element

For Example:

O = 1 Element

NaSi = 2 Elements

Answer:

1. 7 periods

2. 18 groups

3.Magnessium

4.Fluorine

5.Nickel

6.Radon

7.Francium

8.Lead

Explanation:

Answer:

Option c.

Explanation:

According to Newton's law, formula to solve this problem is:

F = m . a

Mass → 1000 kg

a → 3 m/s²

F = 1000 kg . 3m/s² →  3000 N

1 N = 1 kg .  m/s²  according to SI, Internation System of units.

Answer:

True

Explanation:

Answer:

True

Explanation:

Hormones  are chemical messengers secreted into blood or extracellular fluid by one cell that affect the functioning of other cells. Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are called target cells.

Answer:

The things that are changing in an experiment are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types.

Answer: a double replacement

Explanation:

Answer:

I'm not 100% sure but I think it would be constant

Answer:

The object is moving in the negative direction!

Explanation:The object has a negative velocity) and is speeding up.

Answer:

2KNO3 + Na --> 2KO2 + NaO2 + N2

Explanation:

on the left side there is 1 Nitrogen molecule, but on the right side there are 2.

So, by adding a coefficient of 2 on the left side the N balances out.

Then, the K's aren't balanced anymore. There are 2 K on the left and 1 K on the right.

So, if a coefficient of 2 is added to KO2 on the left, the K is then balanced.

Now check all the other molecules, and everything else is balanced!

On both sides there are 2 K's, 2 N's, 6 O's, 1 Na.

Answer:

???

Explanation:

Answer:

mass matter

Explanation:

Answer:

Explanation:

1) Find number of each of the type of atom that is present in the compound, using the chemical formula .

2) Then multiply number of atoms of each element that is present in the compound with the atomic weight of each of the element

3) Add everything together and add the units (grams/mole ) after the number

Let finds that of water

Chemical formula of water is (H20 )

hydogens atoms= 2

oxygen atom= 1

Atomic weight for Hydrogen= 1

Atomic weight for Oxygen= 16

Total number of atoms of Hydrogen from the formula (H2O)= 2

Total number of atoms of Oxygen from the formula (H2O)= 1

the molar mass=

Hydrogen: ( 2 x 1)= 2

Oxygen: ( 1 x 16)= 16

Add together= (16+2)

= 18

Then add the unit, we have(18 g/mol.)

Answer:

Metabolism

Explanation:

This is called Metabolism.

Metabolism is a combination of spontaneous chemical reactions which release non-spontaneous energy and chemical reactions requiring energy to proceed. In order to perform cellular processes, living organisms can take energy from food, nutrients or sunlight.

Answer:

6)B.C,Ge,Pb,Si

7)A.Be,Mg,Sr

8)D.arsenic,calcium

9)B.Group 13,period 3