Please help!!

All fake answers get reported immediately. Yes, I am a girl -_-

Answer:

0.0162 moles (3 s. f.)

Explanation:

moles = mass / Ar

moles = 3.2 / 197.0

moles = 0.0162436

moles = 0.0162 (3 s. f.)

Answer:

B. gas state at room temperature

Explanation:

Answer:

KI 1.0 M

Explanation:

Freezing point of a substance is a colligative property. This means that it depends on the amount of substance present is the system.

The freezing point is given by; T - Ta = K * m * i

Where;

T = freezing point of the pure solution

Ta = freezing point of the solution containing the solute

K = freezing point constant

m = molality of the solution

i= Van't Hoff factor

If we look at all the options provided, KI has only two particles in solution and a molality of 1.0 m hence it should exhibit the lowest freezing point of solution.

Answer: a) Table Salt

good luck

There is, however, a relationship between a planet's distance from the Sun and its period of revolution. Kepler's third law of planetary motion says that the square of the planet's orbital period is proportional to the cube of its semimajor axis.

According to Kepler's third law of planetary motion, a planet's semimajor axis and orbital period are inversely proportional.

Kepler's third law is defined as the cubes of the semi-major axes of the planets' orbits are directly proportional to the squares of the planets' orbital periods. According to Kepler's Third Law, as an orbiting planet's radius increases, so does the time of its orbit around the Sun. A planet's orbits around the sun are accurately described by Kepler's third law in terms of their period and distance.

The cube (third power) of an orbital radius is directly related to the square (second power) of a planet's period (P2 = R3). The period of revolution shortens as the planet's distance from the sun rises.

Thus, according to Kepler's third law of planetary motion, a planet's semimajor axis and orbital period are inversely proportional.

To learn more about Kepler's third law, refer to the link below:

https://brainly.com/question/1608361

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There is an increase in temperature when the rate of chemical reactions increases.

The chemical reaction is the process in which the two or more substances where the reactions are converted into one or more different substances. These may be either chemical elements or compounds.

The chemical reaction rearranges the atoms of the reactants to create the different substances of the product. The speed of the reaction depends on the rate of temperature and as well reactant itself.

Find out more information about the chemical reactions.

brainly.com/question/16416932

Answer:

It increases when a catalyst is added.

Explanation:

"A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism." (Khan Academy)

Answer:

D good luck on your test

Explanation:

Answer:

Based on its mass, the sun's gravitational attraction to the Earth is more than 177 times greater than that of the moon to the Earth. If tidal forces were based solely on comparative masses, the sun should have a tide-generating force that is 27 million times greater than that of the moon.

Answer:

2 moles of H2

Explanation:

From the equation

2 mol Na gives 1 mol H2

When we have 4 mole of Na then we get 2 moles of H2

Answer:

1.204 × 1024

Explanation:  i just did this question

Answer:

Molecular formula => C₃H₈O₃

Explanation:

From the question given above, the following data were obtained:

Carbon (C) = 39.12%

Hydrogen (H) = 8.75%

Oxygen (O) = 51.12%

Molar mass of compound = 92.09 g/mol

Molecular formula =?

Next, we shall determine the empirical formula of the compound. This can be obtained as follow:

C = 39.12%

H = 8.75%

O = 51.12%

Divide by their molar mass

C = 39.12 / 12 = 3.26

H = 8.75 / 1 = 8.75

O = 51.12 / 16 = 3.195

Divide by the smallest

C = 3.26 / 3.195 = 1

H = 8.75 / 3.195 = 2.7

O = 3.195 / 3.195 = 1

Thus, the empirical formula is CH₂.₇O

Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:

Empirical formula = CH₂.₇O

Molar mass of compound = 92.09 g/mol

Molecular formula =?

Molecular formula = Empirical formula × n

Molecular formula = [CH₂.₇O]ₙ

92.09 = [12 + (2.7×1) + 16] × n

92.09 = 30.7n

Divide both side by 30.7

n = 92.09 / 30.7

n = 3

Molecular formula = [CH₂.₇O]ₙ

Molecular formula = [CH₂.₇O]₃

Molecular formula = C₃H₈O₃

Answer: For question, C. 224.1534

Explanation:

1 mole is equal to 1 moles Zn3N2, or 224.1534 grams.

Answer:

vinegar, soft drinks, seltzer water , citrus fruits

Explanation:

Answer:

Deci trebuie sa te aplici cu 2 din3 pe suprafata pamanyului chinez

Explanation:

Deci 1287+2086+2762+7:5

Answer:

48 °C

Explanation:

q = 90J

m = 15 g

C = 0.126 J/gºC

q = mct

90 = (15)(0.126)t

t = 47.62 °C = 48 °C

Answer:

Explanation:

Formula

E = m * c * Δt

Δt is what you seek.

Givens

E = 90 joules

m = 15 grams

c   = 0.126

Solution

90 = 15 * 0.126 * Δt         Divide by 15

90/15 = 15/15 * 0.126 * Δt

6 = 0.126 * Δt                  Divide by 0.126

6/0.126 = Δt

47.619 = Δt

Δt = 48 oC

Answer:

4202.1 K

Explanation:

From;

PV=nRT

P= pressure of the gas = 18.5 bar

V = volume of the gas = 115L

n= number of moles of the gas =  6.1 mole

T= temperature of the gas = ?

R = gas constant = 0.083 L⋅bar⋅K−1⋅mol−1

T = PV/nR

T = 18.5 * 115/6.1 * 0.083

T = 2127.5/0.5063

T= 4202.1 K

Answer:

The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.

Explanation:

The Molar Fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution, which are calculated by adding the moles of solute (s) and solvent.

It is calculated by dividing the number of moles of one of the components by the total number of moles of the solution.

The sum of all the molar fractions of the substances present in a solution is equal to 1.

So, the expression to calculate the mole fraction is:

[tex]Molar fraction (Xi)=\frac{moles of sudstance}{total moles of the solution}[/tex]

Being the molar mass of the compounds:

the number of moles that represent the mass quantities is calculated as:

So the total moles in solution are 6.52 moles + 27.78 moles = 34.3 moles

The mole fraction of ethanol in the solution is calculated as:

[tex]mole fraction of ethanol=x_{ethanol} =\frac{6.52 moles}{34.3 moles}[/tex]

[tex]x_{ethanol} =0.19[/tex]

The mole fraction of water in the solution is calculated as:

[tex]mole fraction of water=x_{water} =\frac{27.78 moles}{34.3 moles}[/tex]

[tex]x_{water} =0.81[/tex]

Then:

[tex]x_{water} +x_{ethanol} = 0.81 + 0.19[/tex]

[tex]x_{water} +x_{ethanol} =1[/tex]

The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.

.

The mole fraction of ethanol and water would be 0.19 and 0.81 respectively

The mole fraction of a substance in a solution is the mole of that substance per total number of moles of substances in the solution.

Mathematically, mole fraction of a substance = mole of the substance/total mole of solution.

In this case:

Mole of 300 g ethanol = mass/molar mass

                                     = 300/46

                                             = 6.52 moles

Mole of 500 g water = 500/18

                                  = 27.78 moles

Total moles = 6.52 + 27.78

                       = 34.3 moles

Mole fraction of ethanol = 6.52/34.3

                                         = 0.19

Mole fraction of water = 0.81

Mole on mole fractions can be found here: https://brainly.com/question/2060778?referrer=searchResults

• Synthetic fibres are nonbiodegradable .

• Synthetic fibres melt and burn easily.

Answer:

los metales alcalinotérreos: berilio (Be), magnesio (Mg), calcio (Ca), estroncio (Sr), bario (Ba) y radio (Ra).

o simplemente llamado grupo 2A

Explanation:

Have GM crops caused damage to the environment? Crops do not damage the environment simply because they are GM. Some farming practices, such as the overuse of herbicides resulting in the excessive eradication of wild plants from farmland have been shown to harm the environment.

Some benefits of genetic engineering in agriculture are increased crop yields, reduced costs for food or drug production, reduced need for pesticides, enhanced nutrient composition and food quality, resistance to pests and disease, greater food security, and medical benefits to the world's growing population.

Answer:

Yes

Explanation:

Food that comes from the engineering food factories wrapped in plastic which can be dangerous for the environment.

Answer:

Respiration is the process humans and animals breathe c02 out

Answer:

CO2 is released into the air when we breathe

The process is called respiration

Answer:condensation

Condination

Explanation:

Answer:

Na

Explanation:

Answer:

.-.

Explanation:

Answer:

There will be 4 moles of NO2 produces at the end of the reaction.

Explanation:

First of all, you should consider that the limiting reactant is NO, since it's the first it's going to end in the reaction.

After that, the conversion factor must be done with the limiting reactant (NO). So since you have 4 mol of NO and the relation of NO with NO2 its 2:2, you will end up having 4 moles of NO2.

Answer:

number 1 I think

Explanation:

I did this at school but forgot

Answer:i dont even know

Explanation:

help me

Na2SO3 – Sodium sulfite