the molecular formula for caffeine is c8h10o2n4. how many moles of c atoms are present in a 2.0 g sample of caffeine?

Calcium metal with chromium(III) chloride would react. Calcium metal is more reactive than chromium metal; therefore, putting calcium metal in chromium chloride would create a reaction, where as putting chromium metal in calcium chloride would not form any reaction.

Answer: The light bends closer towards the normal and is refracted.

Explanation:  The light is passing through something less dense (air) to more dense (water), it's going to bend the light more towards the normal and will refract the light making it look bent at the surface of the water.

Answer:

Explanation:

because

Neon and Krypton, both are belongs to Inert or Noble gas Group

Answer:

7 grams

Explanation:

The water evaporates leaving the same amount of salt behind

hope this helps...

Answer:

IONIC BOND

Explanation:

the force between oppositely charged IONS is and IONIC BOND

The vapor pressure of a solution of 0.114 mol of cholesterol in 6.72 mol of toluene at 32 degree is 40.6Torr.

The Raoult's Law equation may be used to determine the solution's vapour pressure:

Vapor Pressure of Solution = (Mol Fraction Cholesterol * Vapor Pressure Cholesterol) + (Mol Fraction Toluene * Vapor Pressure Toluene)

Mol Fraction Cholesterol =\(\frac{0.114}{ (0.114 + 6.72) }= 0.016\)

Vapor Pressure Cholesterol = 0 (Cholesterol has no vapor pressure)

Mol Fraction Toluene =\(\frac {6.72}{(0.114 + 6.72)} = 0.984\)

Vapor Pressure Toluene = 41 Torr

Vapor Pressure of Solution =\((0.016 * 0) + (0.984 * 41) = 40.6 Torr\)

Therefore vapour pressure of solution is 40.6Torr.

Any of the lipids, a group of specific chemical compounds, include cholesterol. It is a sterol, which is a subclass of lipid. Toluene, sometimes called toluol, is an aromatic hydrocarbon that has been replaced. It is a colourless, insoluble in water liquid with a paint thinner-like odour.

learn more about Raoult's Law Refer:brainly.com/question/9720507

#SPJ4

Answer:

ok so im gonna go and do some for your latest questions then if thats alright with you

Explanation:

i need points so im trying to help as many people as i can before the end of the day.

but you have to make the questions forst so i can help you understand them

Reaction 2

ATP + H2O ⟶ ADP + Pi + 7.3 kcal/mol is a spontaneous (favorable) reaction.

To determine whether a reaction is spontaneous or nonspontaneous, we can examine the change in free energy (ΔG) for the reaction. If ΔG is negative, the reaction is spontaneous, indicating that it can proceed independently without requiring an input of energy. If ΔG is positive, the reaction is nonspontaneous and requires an input of energy. In the given reaction, 7.3 kcal/mol is released as free energy. This implies that the reaction releases energy and is, therefore, exergonic. In other words, the products (ADP and Pi) have lower free energy than the reactants (ATP and H2O). Since the reaction releases energy and has a negative ΔG, it is considered spontaneous. Spontaneous reactions tend to occur naturally and do not require external energy sources. In the context of glycolysis, the coupling of Reaction 1

(glucose + Pi ⟶ glucose-6-phosphate + H2O)

with Reaction 2

(ATP + H2O ⟶ ADP + Pi + 7.3 kcal/mol)

Allows for the overall process of glucose phosphorylation to proceed. The energy released in spontaneous Reaction 2 drives the nonspontaneous Reaction 1, making the overall process energetically favorable.

To learn more about spontaneous reaction

brainly.com/question/31199175

#SPJ11

Answer:

Explanation: I also have a question if anyone can help in chem please

Answer:

To find the mass of a 19.6 ml solution of 18.0 wt% cacl2, we can use the density of the solution and the volume.

First, we need to convert the percentage concentration to a mass fraction. We can do this by multiplying the percentage by the mass of one mole of cacl2 (110.98 g/mol) and then dividing by 100.

mass fraction = (18.0 wt%) * (110.98 g/mol) / 100 = 19.79 g/100g

Next, we can use the density of the solution to find the mass of 19.6 ml of the solution:

mass = density * volume = 1.165 g/ml * 19.6 ml = 22.904 g

Now, we can convert the mass to milligrams by multiplying by 1000

mass (milligrams) = 22.904 g * 1000 = 22904 mg

So, the mass of a 19.6 ml solution of 18.0 wt% cacl2 is 22904 mg

Answer:

The forensic scientist must be able to tell the difference between the substances.

Explanation:

It is important for forensic scientists to be able to identify particular drugs so they have evidence for the case that a certain drug was present.

The goal of forensic drug chemistry is to determine whether the material submitted contains an illegal substance.

\({ \green{ \tt{option}}} \: (b)\)

\({ \orange{ \bold{A \: water \: is \: considered \: as \: compound \: because}}}\)

\({ \red{ \tt{you \: can \: separate \: the \: oxygen \: from \: the \: hydrogen \: via \: chemical \: means}}}\)

a. When the box is opened after ten days, you would notice that the plant has grown towards the hole in the box.

b. This response is useful because it allows the plant to maximize its exposure to light for photosynthesis, ensuring its survival and growth.

c. Other stimuli the stem of a plant may respond to include gravity, touch, chemicals, water, and temperature.

a. When the box is opened after ten days, you would likely notice that the plant has grown towards the small hole in the box. The stem of the plant would have elongated and bent to direct its growth towards the source of light.

b. This response of the plant is useful because it demonstrates phototropism, which is the plant's ability to respond and grow towards a light source.

By growing towards the hole and orienting itself towards the light, the plant is maximizing its exposure to sunlight, which is essential for photosynthesis. Sunlight provides the energy necessary for the plant to produce food and carry out various metabolic processes. Therefore, the plant's response helps it optimize its chances of survival and growth.

c. Apart from light, plants can respond to various other stimuli. Some examples of stimuli to which the stem of a plant may respond include:

Gravitropism: Plants can respond to gravity by orienting their growth in relation to the gravitational force. The stem may grow upwards against gravity (negative gravitropism) or downwards with gravity (positive gravitropism).

Thigmotropism: This is the response of a plant to touch or physical contact. The stem may grow towards or away from a physical support or object it comes in contact with.

Chemotropism: Plants can respond to chemicals in their environment. For example, the stem may grow towards or away from a particular chemical stimulus.

Hydrotropism: This is the response of plants to water. The stem may grow towards a source of water, allowing the plant to access the necessary moisture for survival.

Temperature: Plants can also respond to changes in temperature. For example, the stem may grow towards warmer temperatures or away from extreme heat or cold.

For more such questions on photosynthesis visit:

https://brainly.com/question/8401042

#SPJ8

The complete catabolism of a reduced organic energy source to CO2, using glycolytic pathways and the TCA cycle, with oxygen as the terminal electron acceptor for electron transport, is called aerobic respiration.

Aerobic respiration is the process by which living organisms convert organic compounds such as glucose into carbon dioxide, water, and energy in the form of ATP. The process begins with glycolysis, which occurs in the cytoplasm of the cell and converts glucose into pyruvate.

Pyruvate then enters the TCA cycle in the mitochondria, where it is further broken down into CO2 and water, releasing energy in the form of ATP. The final step is electron transport, where electrons are transferred to oxygen, producing water and ATP. This process is known as oxidative phosphorylation, and it generates most of the ATP in aerobic organisms.

To learn more about aerobic respiration, here

https://brainly.com/question/12605249

#SPJ4

Answer:

So the answer is gonna be how to get enough energy for your daily life

Explanation:

Sometimes the human body cant get enough energy from the food and protein the food gives out.

Answer:

If a person pushes something and it doesn't change its position then it is called balanced force.

Answer:

2.77

Explanation:

pH = - log (1.70 x 10^-3)  = 2.77

Answer:

The laws are: (1) Every object moves in a straight line unless acted upon by a force.

(2) The acceleration of an object is directly proportional to the net force exerted and inversely proportional to the object's mass.

(3) For every action, there is an equal and opposite reaction.

hey mate ..

this image best explains the 3 laws ..

Thank u ..

plz mark me as brainliest ..

follow me

Answer:

B

Explanation:

Both plain and plateau have flat surfaces. However, a plain is located in a low-lying area while a plateau is located on an elevated area. In essence, a plateau can be viewed as an elevated plain or a plain that is bordered by cliffs.

The correct option is B.

The balanced chemical equation of the given statement is-

       Zn + 2HCl → ZnCl2 + H2

Zn has a molar mass of 65.38 g mol 1.

HCl has a molar mass of 36.458 g mol-1.

Calculate the moles of each reactant:

  (1 mol Zn/ 65.38 g Zn)  (150 g Zn) = 2.2943 mol Zn

 (1 mol HCl/ 36.458 g HCl)  (73 g HCl) = 2.0023 mol HCl

Because there is an excess of zinc (Zn), hydrochloric acid (HCl) must be the cause.                                    

 restricting agent.

 Hydrochloric acid (HCl) is the limiting agent.

The mass in molars of    

136.3 g mol-1 is ZnCl2.

 Cu has a molar mass of 68g mol-1.

  Magnesium (Mg) being a limiting reagent results in:

  (10.00 g Mg) divided by (1 mol Mg / 24.305 g Mg), (1 mol Cu / 1 mol Mg), and (68 g Cu / 1 mol Cu) yields 28.15 g.

28.15 grams of formed ZnCl2.

To know more about similar problem follow link

brainly.com/question/24191406

#SPJ1

Answer:

D

Explanation:

Answer:

the answer is D I did that one in 5th grade

Answer:

did you have options, cause if you did chose something alond the lines of

Explanation:

A real gas is a gas that does not behave as an ideal gas due to interactions between gas molecules. A real gas is also known as a nonideal gas because the behavior of a real gas in only approximated by the ideal gas law.

Answer:

D= .7

C= 1.25

B= 2.2

A= 3.6

Answer:

Explanation:

1).  Ca(NO₃)₂ + KI → CaI + K(NO₃)₂

    This equation is incorrect.

    When Ca⁺⁺ reacts with I⁻, final product is CaI₂

    And when K⁺ react with NO₃⁻, final product is KNO₃

    Hence the equation will be,

    Ca(NO₃)₂ + KI → CaI₂ + KNO₃

    Now we have to balance this equation.

     Ca(NO₃)₂ + 2KI → CaI₂ + KNO₃

                          ↓

     Ca(NO₃)₂ + 2KI → CaI₂ + 2KNO₃

2). Ca(NO₃)₂ + KOH → CaOH + K(NO₃)₂

    This equation is incorrect,

    Since the reaction of Ca⁺⁺ with OH⁻ gives the final product     Ca(OH)₂

    And final product of K⁺ and NO₃⁻ is KNO₃

    Therefore, the equation will be,

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + KNO₃

    Now we will balance this equation by changing the coefficients of the      molecules until the number of atoms on both the sides become equal.

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + 2KNO₃

                                ↓

     Ca(NO₃)₂ + 2KOH → Ca(OH)₂ + 2KNO₃

3). Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2Na(NO₃)₂

    This equation is incorrect,

    Since the reaction of Na⁺ and NO₃⁻ gives the final product    NaNO₃.

    Therefore, the correct equation will be,

    Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃

     This equation is in the balanced form.

The partial pressure of carbon dioxide (CO2) at 950°C assuming that the activities of pure solid and liquid species are equal to one is approximately 0.0276 atm.

a) The balanced chemical reaction for the reduction of iron oxide (FeO) by carbon reductant at 950°C to form pure iron and carbon dioxide (CO2) gas leaving the reactor at 950°C is as follows: $$\rm FeO + C \rightarrow Fe + CO_2$$b)

The variation of Gibbs standard free energy of the reaction at 950°C can be determined using the formula, ΔG° = ΔH° - TΔS°

Where, ΔG° = standard Gibbs energy change, ΔH° = standard enthalpy change, T = temperature in Kelvin, ΔS° = standard entropy change.

Now, let us calculate each of these terms.ΔH° can be calculated using the following equation: ΔH° = ∑H°(products) - ∑H°(reactants)

We have, FeO (s) → Fe (s) + 1/2 O2 (g)Hence, ΔH° = H°(Fe) - H°(FeO) - 1/2 H°(O2)

We can find the values of enthalpies of formation (H°) from the given table of thermodynamic data: H°(Fe) = 0 kJ/molH°(FeO) = -272.6 kJ/molH°(O2) = 0 kJ/mol

Substituting these values in the above equation, we get, ΔH° = 0 - (-272.6) - 1/2 (0) = +272.6 kJ/mol

Now, we need to calculate ΔS°. We can use the following equation for the same: ΔS° = ∑S°(products) - ∑S°(reactants)

Here, the entropy change of solid Fe and CO2 gas is assumed to be constant (since the activity of pure solid and liquid species are equal to one), so we can use the standard molar entropies (S°) directly from the given table of thermodynamic data. S°(FeO) = 87.4 J/(mol·K)S°(CO2) = 213.6 J/(mol·K)S°(Fe) = 27.3 J/(mol·K)

Therefore, ΔS° = S°(Fe) + S°(CO2) - S°(FeO)ΔS° = 27.3 + 213.6 - 87.4 = +153.5 J/(mol·K)

Now, substituting the values of ΔH° and ΔS° in the formula of ΔG°, we get,ΔG° = ΔH° - TΔS°ΔG° = (+272.6 kJ/mol) - (950 + 273) K × (+153.5 J/(mol·K)) = -84.5 kJ/mol

Therefore, the variation of Gibbs standard free energy of the reaction at 950°C is -84.5 kJ/mol.

c) The partial pressure of carbon dioxide (CO2) at 950°C can be calculated using the following formula derived from the Gibbs-Duhem equation: $$P_{CO_2} = P^0_{CO_2} \cdot e^{-\Delta G^\circ/RT}$$

Here, P°CO2 is the standard partial pressure of CO2 at 1 atm (which we can take as 1), R is the gas constant (8.314 J/(mol·K)), and T is the temperature in Kelvin (which is 950 + 273 = 1223 K).

We have already calculated ΔG° in part

(b). Substituting these values in the above formula, we get,$$P_{CO_2} = 1 \cdot e^{-(-84.5\times10^3\,J/mol)/(8.314\,J/(mol\cdot K)\times1223\,K)}$$$$\

therefore P_{CO_2} \approx 0.0276\,atm$$

Therefore, the partial pressure of carbon dioxide (CO2) at 950°C assuming that the activities of pure solid and liquid species are equal to one is approximately 0.0276 atm.

To know more about carbon dioxide refer to:

https://brainly.com/question/2041389

#SPJ11

The energy in the ground state of the electron confined in a 10 nm box is approximately 10.89 eV, and the energy in the first excited state is approximately 43.56 eV.

To calculate the energy of an electron confined in a 10 nm box, we can use the formula for the energy levels of a particle in a one-dimensional infinite potential well:

E_n = (n^2 * h^2) / (8 * m * L^2)

where:

E_n is the energy of the nth energy level,

n is the quantum number of the energy level (n = 1 for the ground state),

h is the Planck's constant (6.626 x 10^-34 J·s),

m is the mass of the electron (9.10938356 x 10^-31 kg),

L is the length of the box (10 nm = 10 x 10^-9 m).

Let's calculate the energy in the ground state (n = 1) and the first excited state (n = 2):

For the ground state (n = 1):

E_1 = (1^2 * h^2) / (8 * m * L^2)

Substituting the values:

E_1 = (1^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2)

Calculating this expression will give us the energy in the ground state.

For the first excited state (n = 2):

E_2 = (2^2 * h^2) / (8 * m * L^2)

Substituting the values:

E_2 = (2^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2)

Calculating this expression will give us the energy in the first excited state.

Please note that the energies calculated will be in joules (J). If you prefer electron volts (eV), you can convert the results by dividing by the electron volt value (1 eV = 1.602 x 10^-19 J).

Performing the calculations:

For the ground state:

E_1 = (1^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2) ≈ 1.747 x 10^-18 J

For the first excited state:

E_2 = (2^2 * (6.626 x 10^-34 J·s)^2) / (8 * (9.10938356 x 10^-31 kg) * (10 x 10^-9 m)^2) ≈ 6.987 x 10^-18 J

Converting the energies to electron volts (eV):

E_1 ≈ 10.89 eV (rounded to two decimal places)

E_2 ≈ 43.56 eV (rounded to two decimal places)

Therefore, the energy in the ground state of the electron confined in a 10 nm box is approximately 10.89 eV, and the energy in the first excited state is approximately 43.56 eV.

Learn more about electron from the given link!

https://brainly.com/question/13998346

#SPJ11

Answer:

let the number be x

so (x+6)/3 =5

x+6=15

x=9