Combustion of 30.42 g of a compound containing only carbon, hydrogen, and oxygen produces 35.21 g CO2 and 14.42 g H2O. What is the empirical formula of the compound

Answer:

D) Endothermic

Explanation:

An endothermic reaction absorbs heat. In this case, the wax absorbs the heat and it melts.  

Also, I took the exam and I got it right.

Answer:

Endothermic is correct

The whole Activity , poem and paragraph is missing in the question.

Answer:

(1) Liquid A

(2) Solid A

Explanation:

Using this part of the given poem

Substances and mixtures behave differently,

During boiling and melting most especially

Boiling point of substance is fixed while mixture is not

Substance melts completely but mixture does not

The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A

Solid A is melting completely so Solid A is a pure substance.

Answer:

Gold, Platinum, Silver, Ruthenium

Answer: The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).

Explanation: The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.

Answer:

26.982 g

i think so..........

Answer:

False, the nucleus is not inside the chromosomes, but the chromosomes are inside the nucleus.

Answer:

A) 21 - 6 carbon, 7 oxygen, and 8 hydrogen

B) 12 - 6 hydrogen, 3 carbon, and 3 oxygen

Explanation:

Also, here is #39 :)

A) 56 - 36 Hydrogen, 18 Carbon, and 2 Oxygen

B) 167 - 104 Hydrogen, 57 Carbon, and 6 Oxygen

Answer:

C. 2AgNO3(aq) + CaBr2(aq) --> 2AgBr(s) + Ca(NO3)2(aq)

Explanation:

Answer: The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Explanation:

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Answer: gas mask

Explanation: A gas mask provides optimal protection from vapor and fumes.

Answer:

9^3 i think so like 279

Explanation:

blah

The maximum mass of hydrogen sulfide that can form is 17.01 g.

What is Limiting Reagent?

A limiting reagent, also known as a limiting reactant, is the substance that is completely used up in a chemical reaction and limits the amount of product that can be formed. It is the reactant that is present in the smallest stoichiometric amount and, as a result, determines the theoretical yield of the reaction. The other reactants may be present in excess and may not be completely used up.

To determine which reactant is the limiting reagent, we need to calculate the amount of product that each reactant would produce and see which one produces less.

The balanced chemical equation for the reaction between aluminum sulfide and water is:

First, we need to calculate the amount of moles of each reactant:

moles of Al2S3 = mass ÷ molar mass = 25.00 g ÷ 150.16 g/mol = 0.1664 mol

moles of H2O = mass ÷ molar mass = 50.00 g ÷ 18.02 g/mol = 2.776 mol

Next, we need to determine the limiting reagent. From the balanced equation, we can see that one mole of Al2S3 reacts with 6 moles of H2O. Therefore, the amount of H2O required to react with 0.1664 mol of Al2S3 is:

0.1664 mol Al2S3 × 6 mol H2O/mol Al2S3 = 0.9984 mol H2O

Since we have 2.776 mol of H2O available, we have more than enough water to react with the 0.1664 mol of Al2S3. This means that aluminum sulfide is the limiting reagent.

To calculate the maximum mass of hydrogen sulfide that can form, we need to use the amount of moles of Al2S3 as the basis of our calculation. From the balanced equation, we know that 1 mole of Al2S3 produces 3 moles of H2S. Therefore:

moles of H2S = moles of Al2S3 × 3 mol H2S/mol Al2S3 = 0.1664 mol × 3 mol H2S/mol Al2S3 = 0.4992 mol H2S

Finally, we can calculate the mass of hydrogen sulfide produced using its molar mass:

mass of H2S = moles of H2S × molar mass = 0.4992 mol × 34.08 g/mol = 17.01 g

Therefore, the maximum mass of hydrogen sulfide that can form is 17.01 g.

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Answer:

\(\boxed {\boxed {\sf 928.8 \ grams}}\)

Explanation:

Density is the mass per unit volume of a substance. The following formula is used for calculating density.

\(\rho= \frac{m}{v}\)

We know the density of aluminum is 2.70 grams per milliliter. The mass is unknown, but we know the piece of aluminum has a volume of 344 milliliters.

Substitute these values into the formula.

\(2.70 \ g/mL = \frac {m}{344 \ mL}\)

We are solving for the mass, so we must isolate the variable m. It is being divided by 344 milliliters. The inverse operation of division is multiplication. Multiply both sides of the equation by 344 mL.

\(344 \ mL *2.70 \ g/mL = \frac {m}{344 \ mL} * 344 \ mL\)

\(344 \ mL *2.70 \ g/mL =m\)

The units of milliliters cancel.

\(344 *2.70 \ g=m\)

\(928.8 \ g =m\)

The mass of the piece of aluminum is 928.8 grams.

Answer:

42000km

Explanation:

Average Speed (v) can be calculated using the formula as follows:

Average speed = distance (d) ÷ time (t)

According to this question, a space shuttle travels around the Earth at a constant speed of 28000 km/hr in 90 minutes.

Since 60 minutes = 1 hr

90 minutes = 90/60

= 3/2 or 1.5hours.

Using speed = distance/time

Distance (km) = speed × time

Distance = 28000 km/hr × 1.5hr

Distance = 42000km

Answer:

1.7820210165667731 your welcome :)

Explanation:

While having experienced polar explorers at the Catlin Arctic Survey would have been beneficial in many ways, it would also have been important for them to work collaboratively with the rest of the team.

Advantages:

Experienced polar explorers would have had a wealth of knowledge and skills, such as how to travel over the ice, how to set up camp, and how to handle emergencies.

Experienced polar explorers would have been able to make informed decisions about the best routes to take and the most efficient ways to travel. This could have helped to save time and energy.

Disadvantages:

Experienced polar explorers may have been set in their ways and resistant to new ideas. This could have hindered the team's ability to adapt to changing circumstances and make the most of new opportunities.

Experienced polar explorers may have been overconfident and taken risks that the rest of the team was not comfortable with. This could have put everyone's safety at risk.

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Answer:

True

Explanation:

A typhoon forms when wind blows into areas of the ocean when the water is warm. These winds collect moisture and rise, while colder air moves in below. This creates pressure, which causes the winds to move very quickly. The wind rotates, or spin, around a center called an eye.

Answer:

4

Explanation:

Light refracts when it passes through something transparent at an angle so that eliminates the other 3.

or put differently

Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density)

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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Answer:

We can use the ideal gas law, PV = nRT, to solve for the density at STP (standard temperature and pressure). At STP, the temperature is 273.15 K and the pressure is 1 atm. We know the molar mass of NO2 is 46.01 g/mol. We also know that 1 mole of any gas at STP occupies a volume of 22.4 L.

First, we can calculate the number of moles of NO2 at STP:

n = PV/RT = (1 atm)(22.4 L)/(0.08206 L·atm/mol·K)(273.15 K) = 1.00 mol

Next, we can calculate the mass of 1 mole of NO2:

46.01 g/mol

Finally, we can calculate the density of NO2 at STP:

density = mass/volume = (46.01 g/mol)/(22.4 L) = 2.054 g/L

Therefore, the density at STP of NO2 gas (molar mass = 46.01 g/mol) in grams per liter is 2.054 g/L.

Explanation:

The Pacific Ocean is the largest ocean in the world based on water volume, totaling some 660 million cubic kilometers and is almost equally divided into the North and South Pacific waters.

MgBr₂(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + Mg(NO₃)₂(aq)

The electrolyte in the solution produces ions.

The equation of a chemical reaction can be expressed in the equation of the ions

For strong electrolytes (the ionization rate = 1) is written in the form of separate ions, while the weak electrolyte (degree of ionization <1) is still written as an un-ionized molecule

In the ion equation, there is a spectator ion that is the ion which does not change (does not react) because it is present before and after the reaction

When these ions are removed, the ionic equation is called the net ionic equation

For gases and solids including water (H₂O) can be written as an ionized molecule

A molecular equation is a chemical equation expressed as a molecule

So only the dissolved compound is ionized ((expressed in symbol aq)

Reaction

MgBr₂(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + Mg(NO₃)₂(aq)

Mg²⁺(aq)+2Br⁻(aq) + Pb²⁺(aq)+2NO₃⁻(aq)⇒PbBr₂(s) + Mg²⁺(aq)+2NO₃⁻(aq)

spectator ions : Mg²⁺(aq) and 2NO₃⁻(aq)

2Br⁻(aq) + Pb²⁺(aq)⇒PbBr₂(s)

The balanced molecular equation:

MgBr₂(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + Mg(NO₃)₂(aq)

The  complete ionic equation:

Mg²⁺(aq)+2Br⁻(aq) + Pb²⁺(aq)+2NO₃⁻(aq)⇒PbBr₂(s) + Mg²⁺(aq)+2NO₃⁻(aq)

The net ionic equation

2Br⁻(aq) + Pb²⁺(aq)⇒PbBr₂(s)

A chemical equation in which the number of each type of atom is equal on the two sides of the equation. Subscripts - Part of the chemical formulas of the reactants and products that indicate the number of atoms of the preceding element. A reaction that contains the stoichiometric ratios of the reactants and products; these ratios can be used for mole -to-mole conversions.

Thus, the reactions when a magnesium bromide solution is mixed with a lead(II) nitrate solution, a precipitate forms is given above.

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DEFINTION

"chemical decomposition produced by passing an electric current through a liquid or solution containing ions."

comment if you need anything else

Love,

-Banana

The mass concentration of sand in the ethanol solution is 0.299 g/dm³.

To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.

Given:

Mass of sand = 0.2 g

Volume of ethanol = two-thirds liter

Converting volume to dm³:

1 liter = 1 cubic decimeter

two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)

Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:

Concentration = Mass / Volume

Concentration = 0.2 g / 0.67 dm³

Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)

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Answer: False

Explanation:

resources which are present in unlimited quantity in nature are called as inexhaustible natural resources.

The balanced equation will be \(2NH_3 + 3I_2 -- > N_2I_6 + 3H_2\)

They are chemical equations that obey the law of conservation of atoms.

In other words, they are equations in which the number of atoms before and after reactions are the same.

Thus, the balanced equation for the reaction will be \(2NH_3 + 3I_2 -- > N_2I_6 + 3H_2\)

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Answer:

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Mechanics/10%3A_Multi-electron_Atoms/Electron_Configuration

Explanation:

Answer:

5.34275*10²³

Explanation:

Molar mass of O2 is 32g/mol

mass of the sample is 28.4g

number of moles = (mass of the sample) / (molar mass of O2)

=28.5g / 32g/mol

=0.8875mol

number of molecules = number of moles * Avogadro's Constant

= 0.8875 * (6.02*10²³)

= 5.34275 molecules

Answer:

123 g

Explanation:

First, we convert 10.0 dL into mL, keeping in mind that:

Now we can multiply the density by the volume in order to calculate the mass:

10.0 dL of a substance with a density of 0.123 g/mL would weigh 123 grams.