plss help me with this I don't even know where to start to solve it

Answer:

less than 4.9 newtons Explanation:

Answer:

[tex]\fbox{ A) A \: is \: limiting \: reactant }[/tex]

[tex]\fbox{ B) B \: is \: limiting \: reactant }[/tex]

[tex]\fbox{ C) A \: is \: limiting \: reactant }[/tex]

[tex]\fbox{ D) A \: is \: limiting \: reactant }[/tex]

Explanation:

Given equation:

[tex]A+3B \rightarrow \: C [/tex]

To find:

Limiting reactant for corresponding number of moles=?

Solution:

We know that the liming reactant is any atom, ion or molecule which is completely consumed during a reaction and other reactant is still left in reactant vessel.

For the given reaction A+3B→C

for every one mole of A three moles of B are required.

﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌

in A) there is one mole of A and 4 mole of B,

if 1 mole of A will react with 3 moles of B, 1 mole of B will be still there in reaction, the reactant was completely consumed is A which is limiting reactant.

﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌

in B) there is 2 mole of A and 3 mole of B,

if 1 mole of A will react with 3 moles of B, 1 mole of A will be still there in reaction, the reactant was completely consumed is B which is limiting reactant.

﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌

in C) there is 0.5 mole of A and 1.6 mole of B

if one mole of A requires three moles of B to complete the reaction then,

0.5 moles of A will require 1.5 moles of B

if 0.5 mole of A will react with 1.6 moles of B, 0.1 mole of B will be still there in reaction, the reactant was completely consumed is A which is limiting reactant.

﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌

in D) there is 24 mole of A and 72 mole of B

if one mole of A requires three moles of B to complete the reaction then,

24 moles of A will require 72 moles of B.

if 24 mole of A will react with 75 moles of B, 3 mole of B will be left over in reaction, the reactant was completely consumed is A which is limiting reactant.

﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌﹌

[tex]\fbox{ A) A \: is \: limiting \: reactant }[/tex]

[tex]\fbox{ B) B \: is \: limiting \: reactant }[/tex]

[tex]\fbox{ C) A \: is \: limiting \: reactant }[/tex]

[tex]\fbox{ D) A \: is \: limiting \: reactant }[/tex]

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Answer:

Point the syringe upright and tap firmly to move the bubbles to the top and expel by pushing the plunger

Explanation:

If you hold the syringe upside down the bubbles will end up at the bottom of the syringe by the plunger since they float up when tapped

Thermal energy is the sum of the kinetic and potential energy of all the particles in an object. The figure shows that if either potential or kinetic energy increases, thermal energy increases.

hope it really helps...!!!

Answer:

60ax 70by 67ay ah251

Explanation:

Answer:

Remember

A sparkler burning is an exothermic reaction

Sparkler burning is an exothermic reaction and so the sign of the ΔH must be negative (–∆H) indicating that heat was released.

Ice melting is an endothermic reaction (+∆H) because the ice absorbs (heat) energy, which causes a change to occur.

Acetone evaporating from skin is an endothermic reaction (+∆H). Because, molecules that are evaporating are absorbing heat. So, evaporation is called endothermic.

Answer: Correct option is B)

The standard enthalpy change of formation of a compound is the enthalpy change which occurs when one mole of the compound is formed from its elements under standard conditions. The equation showing the standard enthalpy change of formation of water is

H
2
(g)+

2
1

​ O

2

​ (g)⟶H

2                                                                   ↑

​ O(l)                                           1 mole of water formed.

∴   Enthalpy of formation is −X2kJ/mol.

________________________________________________________

Explanation:I hope this helped

The pH of an aqueous solution that has a concentration of 0.35 M NaF and pKa for HF = 3.14 is 3.6.

The pH of a solution refers to the degree of acidity or alkalinity of the solution. It can be calculated using the Henderson-Hasselbalch Equation as follows:

pH = pka + log ([A-]/[HA])

Where;

pH = pKa + log([F-]/[HF])

pH = 3.14 + log(1/0.35)

pH = 3.14 + 0.4559 = 3.595

Therefore, the pH of an aqueous solution that has a concentration of 0.35 M NaF and pKa for HF = 3.14 is 3.6.

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Answer:

A Sun that is hot and big and sparkling

Explanation:

A Star is a Sun which is tended to be true

Answer:

A star is a miniature version of a sun, which burns out over a course of time.

Answer:

2-Methylhexane

Explanation:

Since 1.00 atm is equal to 760 mmHg, the height of the column of mercury which would create pressure equal to 1.00 atm is 760 mm or 76 cm

Pressure is defined as the force acting perpendicularly per unit area of a surface.

The units of pressure include;

1 atmosphere is equal to 760 mmHg.

Therefore, the height of the column of mercury which would create pressure equal to 1.00 atm is 760 mm or 76 cm

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[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

The given pictures show conversion of energy from one form to another.

Electric energy to Heat energy

Wind energy to electric energy

Solar energy to light energy

Electric energy to light energy

Based on the bond energies given, the standard enthalpy of the reaction, ΔH°(rxn) is -296 kJ.

The standard enthalpy change of a reaction is the energy changes involved when substances react under standard conditions to form products.

The standard enthalpy of the reaction, ΔH°(rxn) is calculated as follows:

Sum of energy of bonds broken = 839 + (2 × 413) + (432 × 2) = 2529 kJ

Sum of energy of bonds formed = 347 + (6 × 413) = 2825 kJ

ΔH°(rxn) = (2529 - 2825) kJ

ΔH°(rxn) = -296 kJ

Therefore, the standard enthalpy of the reaction, ΔH°(rxn) is -296 kJ.

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The new pressure in the cylinder of the car engine as the piston is moved to the top is 1062.55kPa

Boyle's law states that "volume of a given quantity of gas is inversely proportional to its pressure  as long as temperature remains constant.

It is expressed as;

P₁V₁ = P₂V₂

Given the data in the question;

To determine the new pressure as the piston is at the top of the cylinder, we substitute our given values into the expression above.

P₁V₁ = P₂V₂

P₂ = P₁V₁ / V₂

P₂ = ( 1.0067107atm × 0.6250L ) / 0.0600L

P₂ = 0.629194188Latm / 0.0600L

P₂ = 10.4865698atm

P₂ = 1062.55kPa

Therefore, the new pressure in the cylinder of the car engine as the piston is moved to the top is 1062.55kPa

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A redox reaction with E° = -2.25 V involving the transference of 6 moles of electrons has a ΔG° of 9.38 × 10⁵ J.

The standard Gibbs free energy (ΔG°) is a thermodynamical function that indicates the spontaneity of a reaction.

A redox reaction, in which 6 moles of electrons are transferred (n = 6 mol), has a standard cell potential (E°) of -2.25 V.

Knowing that the Faraday's constant is F = 96,500 J/V.mol, we can calculate the standard Gibbs free energy using the following expression.

ΔG° = - n × F × E°

ΔG° = - 6 mol × (96,500 J/V.mol) × (-2.25 V) = 9.38 × 10⁵ J

A redox reaction with E° = -2.25 V involving the transference of 6 moles of electrons has a ΔG° of 9.38 × 10⁵ J.

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Answer:

[tex]\sf \fbox {mass \:percentage \: = 9.09 \%}[/tex]

Explanation:

Given:

Mass of solute = 15g

Mass of solvent (Water)= 150g

To find:

Mass percentage of sodium chloride=?

Solution:

Let's find out the mass of overall solution first,

Mass of solution= Mass of solute+ mass of solvent

Mass of solution = 15+150= 165 gram

Now we know that,

[tex] \sf \: mass \:percentage \: = \frac{Mass \: of \: solute}{Mass of solution} \times 100 \\ \sf \: mass \:percentage \: = \frac{15}{165} \times 100 \\ \sf \: mass \:percentage \: = \frac{1500}{165} \\ \sf \fbox {mass \:percentage \: = 9.09 \%}[/tex]

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The equilibrium constant of the electriochmeical cell as shown is  2.976.

The equilibrium constant of a reaction shows the extent of the conversion of the reactants to products.

Now we know that;

ΔG = -nFE°cell

n = 2

F = 96,500 J/(V･mol)

E°cell = +0.0140 V

ΔG = -(2 *  96,500  * 0.0140)

ΔG = -2702 J

But;

ΔG = -RTlnK

lnK = -(ΔG/RT)

K = e^[-(ΔG/RT))

K = e^[-(( -2702)/8.314 * 298]

K = 2.976

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answer:

nf=2

Explanation:

It is given that,

Initially, the electron is in n = 7 energy level. When it relaxes to a lower energy level, emitting light of 397 nm. We need to find the value of n for the level to which the electron relaxed. It can be calculate using the formula as :

Explanation:

Formula for Potential energy=mgh mass* gravity*height

21kg × 10 ×32=6720joules

If a 21.0 kg rock rests on the edge of a cliff 32.0 m high, the gravitational potential energy gained by the rock would be 6585.6 Joules.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

As given in the problem a 21.0 kg rock rests on the edge of a cliff 32.0 m high, then we have to calculate the potential energy gained by the rock,

The potential energy of the rock = 21 × 9.8 × 32

                                                      = 6585.6 Joules.

Thus ,If a 21.0 kg rock rests on the edge of a cliff 32.0 m high, the gravitational potential energy gained by the rock would be 6585.6 Joules.

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Answer:

The rocks that result from these processes often have ribbonlike layers and may have shiny crystals, formed by Metamorphic Rock growing slowly over time, on their surface.

The rocks that result from these processes often have ribbonlike layers and may have shiny crystals, formed by Metamorphic rocks

growing slowly over time, on their surface.

Answer:it’s Smartphone microscopes are not great scientific tools.

Explanation:

The statement expressed in stick to real microscopes Smartphone microscopes are not great scientific tools.

Getting to use all the great tools is one of the best parts of constructing something. Power saws, drills, and electric sanders are tools that builders employ to transform basic materials into original designs.

Scientists employ tools to achieve their goals, just like builders do. Researchers can do experiments, make observations, and take precise measurements with the aid of scientific gear.

In this session, we'll talk about some basic scientific instruments that you could find in the science lab at your school, as well as some more sophisticated instruments that biologists use to study the world around us.

Therefore, The statement expressed in stick to real microscopes Smartphone microscopes are not great scientific tools.

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Answer:

.125 M

Explanation:

.15 M/L   * .125 L = .01875 moles

now dilute to 150 cc  (by adding 25 cc)

.01875M / (150/1000) = .125M

Answer:

light years

Explanation:

light year is the DISTANCE light travels in one year ...a very large distance

Answer:

light years

Explanation:

since distance between galaxy space ,objects .

Explanation:

allowing 20% discount on the market price of a watch the value of the watch will be rs 2376 when a VAT of 10% is added ,find it's market price

Answer:

Scientists use the scientific method to make testable explanations and predictions about the world. A scientist asks a question and develops an experiment, or set of experiments, to answer that question. Engineers use the engineering design process to create solutions to problems.

Answer:

your mom

Explanation:

grandma + grandpa = mom