How many g of a 5.0% by weight NaCl solution are needed to give 3.2 g NaCl?

Answer:

whats the question

Explanation:

Explanation:

The Brønsted–Lowry theory is an acid–base reaction theory which was proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923

Given :

The pressure of 50.0 mL of oxygen gas at 100 ºC increases from 735 mm Hg to 925 mm Hg.

Temperature remains constant.

To Find :

The final volume.

Solution :

735 mm Hg = 0.967 atm

935 mm Hg = 1.230 atm

We know, at constant temperature :

[tex]P_iV_i=P_fV_f\\\\V_f=\dfrac{P_iV_i}{P_f}\\\\V_f=\dfrac{0.967\times 50}{1.230}\\\\V_f=39.31 \ mL[/tex]

Therefore, final volume is 39.31 ml.

Hence, this is the required solution.

Answer:

Explanation:

 2Al    +    3 O₂   =    Al₂O₃

2 moles    3 moles        1 mole

b )

1 mole of aluminium oxide is produced from 3 moles of oxygen gas

3.25 moles of aluminium oxide is produced from 3 x 3.25 moles of oxygen

= 9.75 moles of oxygen

= 9.75 x 32grams of oxygen

= 312 grams of oxygen.

c )

3.25 moles of aluminium oxide = 3.25 x 102 = 331.5 grams of aluminium oxide

( molecular weight of aluminium oxide = 102 )

d ) actual yield = 228.4 gram

percent yield = 228.4 x 100 / 331.5

= 69 % approx .

2 Al    +    3 O₂   =    Al₂O₃

3 moles of oxygen gas produces 1 mole of aluminium oxide

3.25 moles of aluminium oxide is produced from 3 x 3.25 moles of oxygen which is  9.75 moles of oxygen

Mass= mole × molar mass

= 9.75 x 32g of oxygen

= 312 g of oxygen.

Mass= mole x  molar mass

3.25 moles of aluminium oxide

= 3.25 x 102

= 331.5 g of aluminium oxide

Percent yield = 228.4 x 100 / 331.5

= 68.89 %

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Explanation:

that u know right .........................

Answer:

all for it 8) !! i have several friends that are trans in fact.

Explanation:

ppl that don't support trans peeps are going to get punted into the sun with no mercy

im nonbinary, but also identify as trans too (the white stripe on the transgender flag is actually "for those who are transitioning or consider themselves having a neutral or undefined gender," according to Monica Helms, who made the most commonly seen trans flag. :]  they don't all identify as trans but can if they want to.

also, a common misconception is that all nonbinary people have to/use they/them pronouns, which is not true. they can use whatever they want because pronouns do not equal gender in most cases. also because they don't have to be put into a strict box of what you can and can't use.

Answer:

40

Explanation:

D=600

S=40

T=15

600/15 = 40

The cell process used by both plants and animals to access glucose energy is called Cellular respiration.

Cellular respiration is a series of metabolic reactions and activities that occur in organisms' cells to transform chemical energy from oxygen molecules or nutrients to adenosine triphosphate.

Hence the required cell process is known as cellular respiration.

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Answer:

2.03 × 10⁻⁵ M

Explanation:

Step 1: Given data

Concentration of Pb(NO₃)₂: 6.73 ppm = 6.73 mg/L

Step 2: Convert 6.73 mg/L to mol/L

The molar mass of 331.2 g/mol.

6.73 × 10⁻³ g/L × 1 mol/331.2 g = 2.03 × 10⁻⁵ mol/L = 2.03 × 10⁻⁵ M

Step 3: Calculate the molar concentration of Pb²⁺

Let's consider the ionization of Pb(NO₃)₂.

Pb(NO₃)₂(aq) ⇒ Pb²⁺(aq) + 2 NO₃⁻(aq)

The molar ratio of Pb(NO₃)₂ to Pb²⁺ is 1:1. The molar concentration of Pb²⁺ is 1/1 × 2.03 × 10⁻⁵ M = 2.03 × 10⁻⁵ M.

Answer: A Atom , molecule

Explanation:

hope this helps

Answer:

3.37kg of NaCl is the salt content of the dead sea

Explanation:

A concentration of 33.7% means there are 33.7g of NaCl in 100mL of solution.

To solve this question we need to convert 10.0L to mililiters, and then, solve for the mass of NaCl in grams and convert it to kg:

Volume in milliliters:

10.0L * (1000mL / 1L) = 10000mL

Mass of NaCl:

10000mL * (33.7g NaCl / 100mL) = 3370g NaCl

In kg:

3370g * (1kg / 1000g) =

Answer:

This question appear incomplete

Explanation:

This question appear incomplete. However, fuel is formed through a natural phenomenon involving the conversion of large amount dead and decayed organisms (usually algae and zooplanktons) to combustible fuel through exposure to relatively high temperature and pressure (over millions of years) in the earth's crust. Thus, since this involves a sort of absorption of heat energy (from the earth's crust), it can be referred to be an endothermic reaction.

Answer:

B, Gas B.

Explanation:

Answer:

The correct answer is b) 2

Explanation:

When is dissolved in water, silver acetate (AgCH₃COO) is dissociated into ions according to the following equilibrium:

AgCH₃COO ⇄ Ag⁺ + CH₃COO⁻

Where Ag⁺ is a silver cation and CH₃COO⁻ is the acetate anion (an organic anion). As we can see, from one single formula unit are obtained 2 ions (1 cation and 1 anion).

Therefore, the correct option is b) - 2

Answer:

it is a chemical change

Explanation:

Common physical changes include melting, change of size, volume, color, density, and crystal form. The classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.

Answer: A and D

Explanation:

I hope this helps. Sorry if I’m wrong

Answer:

Region D

Explanation:

The region is on the tectonic plate boundaries.

Answer: 68.6 mL

Explanation:

We need to use the equation M1V1=M2V2. Molarity's units are in L so we need to convert the 50 ml into L (divide by 1000).

.05(.298)=(x)(.2173)

x = .068 L

to convert to mL we multiply by 1000

.068*1000=68.6 mL

Answer:

Explanation:

Intermolecular forces are the forces that hold the molecules together in a substance. The state in which this substance will be at normal atmospheric conditions, and other physical properties such as boiling and melting points, are a consequence of the intermolecular forces.

The type of intermolecular force that happens in nonpolar compounds is dispersion forces. The atom or nonpolar molecule will be disturbed by the proximity of an ion or a polar molecule, thus shifting its electron cloud. The atom or nonpolar molecule will be an induced dipole.

In these tetrahedral molecules, which are not polar, the attractive forces will be London forces, which arise as a consequence of temporary induced dipoles.

Since these forces depend on proximity (the closer the proximity the larger the attraction) those molecules with a higher molar mass will have a larger electron cloud, which will be more susceptible to the effect of an induced dipole in the surroundings (the electrons are on the outer layers will be less attracted by the nuclei).

CF₄  > CCl₄ > CBr₄ >Cl₄

--------------------------------> Increasing size

--------------------------------> Increasing melting point

The melting point increases as the molecules get bigger, that is, as the number of molecules in the molecule increases.

Answer:

D.) rain water seeps into the ground

Explanation:

Obviously?

Answer:

a simple covalent structure

Explanation:

its has a few non-metal atoms?

Solution :

The sun emits = [tex]$4 \times 10^{26} $[/tex] J of energy per second

                        = [tex]$4 \times 10^{26} \ kg m^2 s^{-3} $[/tex]

We know, [tex]$1 \ J =1 \ kg \ m^2 / s^2 $[/tex]

[tex]$E=mC^2$[/tex] ,   where C = [tex]$3 \times 10^8 \ m/s$[/tex]

[tex]$E=mC^2$[/tex]

[tex]$J=M(M/s)^2$[/tex]

Dividing both sides by 1 second

[tex]$\frac{J}{s}=\frac{M \times m^2 s^{-2}}{sec}$[/tex]

[tex]$\frac{J}{s}=M \times m^2 s^{-3}$[/tex]

Then, [tex]$4 \times 10^{26} \ J/s = M \times m^2 s^{-3} \times (3 \times 10^8)^2$[/tex]

      [tex]$M = \frac{4 \times 10^{26}}{9 \times10^{16}}$[/tex]

      [tex]$M=4.44 \times 10^9 \ kg$[/tex]

Now according to the information, 99.3% hydrogen.

If 0.7 % of hydrogen produce = [tex]$4 \times 10^{26} $[/tex] J of energy per second

Then 1% of hydrogen will produce = [tex]$\frac{4 \times 10^{26}}{0.7}$[/tex]   J energy per second

So, 100% of hydrogen will produce = [tex]$\frac{4 \times 10^{26}}{0.7} \times 100$[/tex]  J energy per second

                                                          = [tex]$5.7143 \times 10^{28 }$[/tex]  J energy per second

Mass of hydrogen undergo fusion in sun per second

[tex]$E=mC^2$[/tex]

Similarly, [tex]$\frac{J}{s}=M \times m^2 s^{-3}$[/tex]

[tex]$5.714 \times 10^{28} \ J/s = M \times (3 \times 10^8)^2 \ m^2 \ s^{-3}$[/tex]

[tex]$M = \frac{5.7143 \times 10^{28}}{9 \times 10^{16}}$[/tex]   kg

[tex]$M= 6.349 \times 10^{11}$[/tex] kg

Answer:

0.047 %

Explanation:

Step 1: Given data

Step 2: Calculate the %v/v of ozone in the air

Air is a mixture of gases. We can find the %v/v of ozone (a component) in the air (mixture) using the following expression.

%v/v = pO₃/P × 100%

%v/v = 0.33 torr/695 torr × 100%

%v/v = 0.047 %

Answer:

A. the UK

Explanation:

Answer:

A the UK

Explanation:

Answer:

7.79 × 10³ L

Explanation:

Step 1: Calculate the total number of moles of carbon dioxide released

50 moles of carbon dioxide are released per hour. The moles released in a six-hour period is:

6 h × 50 mol/1 h = 300 mol

Step 2: Convert the temperature to the Kelvin scale

When working with gases, we need to consider the absolute temperature. We can convert from Celsius to Kelvin using the following expression.

K = °C + 273.15

K = 35 °C + 273.15 = 308 K

Step 3: Convert the pressure to atm

We will use the conversion factor 1 atm = 760 Torr.

740 Torr × 1 atm/760 Torr = 0.974 atm

Step 4: Calculate the volume of the gas

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 300 mol × (0.0821 atm.L/mol.K) × 308 K / 0.974 atm

V = 7.79 × 10³ L

Atomic bombs use much higher enrichment material with over 90% of U235 to create a massive chain reaction and produce a large amount of energy at one time. The control rods in a nuclear reactor are used to control the speed of the chain reaction and can capture free neutrons before they collide with U235 atoms.

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Answer:

Atomic bombs use much higher enrichment material with over 90% of U235 to create a massive chain reaction and produce a large amount of energy at one time.

Explanation:

Answer:

Please mark as brainliest

Explanation:

Ans: Kinetic energy

Another example of kinetic energy is the energy associated with the constant, random bouncing of atoms or molecules. This is also called thermal energy – the greater the thermal energy, the greater the kinetic energy of atomic motion, and vice versa

The energy associated with the random motion of particles in a gas is kinetic energy.  

• A form of energy, which an object or a particle possesses due to its motion is known as kinetic energy.  

• It is a characteristic of a moving particle or object and relies not only upon its motion but also on its mass.  

• The particles of solid are closely packed and thus they cannot move around, therefore, they possess the least kinetic energy.  

• The particles of a liquid are less closely clustered, thus they move around and therefore possess more kinetic energy in comparison to solids.  

• The gas particles are very loosely packed and possess the tendency to move around spontaneously, and therefore, possess very large kinetic energy.  

Thus, kinetic energy is a form of energy associated with the random motion of gas particles.

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Answer:

D. 313 kJ.

Explanation:

Hello!

In this case, since the latent heat of a substance is that heat it releases or absorbs during a phase transition among solid, liquid and gas phases, it is given that it is computed as shown below:

[tex]Q=n*\Delta H_{change}[/tex]

Whereas n are the moles of the substance and the ΔH of change is referred to freezing, melting, condensation, vaporization, sublimation or deposition; therefore, for the vaporization of those gien 7.72 mol of liquid water we obtain:

[tex]Q=7.72mol*40.6kJ/mol\\\\Q=313kJ[/tex]

So the answer is D. 313 kJ.

Best regards!

Answer:

seek shelter under a desk

Explanation:

you may not know whats going on and safety is key. as a teacher they should help calm children down