How many atoms are in 13.0 g Sr

The name of the salt tells us that:

a) there is just one other element combined with the metal by looking at the suffix of the salt's name.

b) the presence of oxygen in a salt can be indicated by the name of the salt.

a) The name of a salt can tell us that there is just one other element combined with the metal by looking at the suffix of the salt's name. If the salt name ends in "-ide," it indicates that the salt is composed of a metal and a single non-metal element.
For example, sodium chloride (NaCl) and potassium bromide (KBr) are salts where the metal (sodium and potassium) is combined with a single non-metal element (chlorine and bromine, respectively). The "-ide" suffix suggests the presence of only one other element in the salt.

b) The presence of oxygen in a salt can be indicated by the name of the salt. If the salt name includes the element oxygen, it suggests that oxygen is present in the salt compound.
For example, sodium carbonate (Na₂CO₃) and calcium sulfate (CaSO₄) contain the element oxygen in their chemical formulas. The presence of oxygen in the salt is implied by the name and the combination of elements in the compound.

Therefore, the name of salt tells us that there is just one other element combined with the metal and there is oxygen present in the salt

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The pressure of hydrogen gas is 276.25 Kpa .

Given,

Mass of aluminum = 29.51g

Temperature (T) = 25.67 degC =298.67 K

Volume (V) = 14.75 L

The required equation when aluminum reacts with excess sodium hydroxide and water is given by ,

2Al + 2NaOH + 2H2O ==>2NaAlO2 + 3H2

molecular mass of aluminum =26.98 g

1 mole of aluminum= 26.98g

2 moles of aluminum = 53.96g

2 mole of aluminum produces =  3  moles of hydrogen gas

53.96 g of aluminum produces = 6 g of hydrogen gas

29.51 g of aluminum produces = 6*(29.51) /53.96 =3.28 g of hydrogen gas

Thus ,

2 g of hydrogen gas = 1 mole of hydrogen

3.28 g of hydrogen gas = 3.28/2 mole =1.64 mol of hydrogen

Thus , n = 1.64 mol

According to ideal gas equation ,

PV=nRT

P=nRT/V

P = 1.64 * (0.0821L atm K^-1mol^-1 ) *(298.67 K)/14.75L

P=2.726 atm

P= 276.25 Kpa

Hence the pressure of hydrogen gas is 276.25 Kpa .

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Answer:

0.06520959450500399

Explanation:

Answer:

46.0055

Explanation:

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

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Explanation:

A nitrogen-containing compound that shows no absorption band at around 3400 cm^−1 and no absorption bands between approximately 1700 cm^−1 and 1600 cm^−1 is likely an amide compound.

Amides typically exhibit a characteristic absorption band in the region of 3200-3500 cm^−1 due to the N-H stretching vibration. The absence of this absorption band suggests the absence of N-H bonds, which rules out compounds like primary or secondary amines.

The absence of absorption bands between 1700 cm^−1 and 1600 cm^−1 eliminates functional groups such as carbonyl compounds (e.g., aldehydes, ketones, carboxylic acids, esters) and imines, which typically exhibit absorption in this region.

Therefore, based on the given information, it can be inferred that the compound is likely not an amine, carbonyl compound, or imine. Other classes of compounds that do not possess these characteristic absorption bands would need to be considered.

Answer:

Approximately \(1.53 \times 10^{23}\) formula units (\(0.254\; \rm mol\)).

Explanation:

Refer to a modern periodic table for the relative atomic mass of magnesium (\(\rm Mg\)) and chlorine (\(\rm Cl\)):

In other words, the mass of \(1\; \rm mol\) of \(\rm Mg\) atoms would be (approximately) \(24.305\; \rm g\).

Likewise, the mass of \(1\; \rm mol\) of \(\rm Cl\) atoms would be approximately \(35.45\; \rm g\).

One formula unit of the ionic compound \(\rm MgCl_{2}\) includes exactly as many atoms as there are in the given formula. The formula mass of a compound is the mass of \(1\; \rm mol\) of the formula units of this compound.

The formula \(\rm MgCl_{2}\) includes one \(\rm Mg\) atom and two \(\rm Cl\) atoms.

Hence, every formula unit of \(\rm MgCl_{2} \!\) would include the same number of atoms: one \(\rm Mg\!\) atom and two \(\rm Cl\!\) atoms. There would be \(1\; \rm mol\) of \(\rm Mg\) atoms and \(2\; \rm mol\) of \(\rm Cl\) atoms in \(1\; \rm mol\!\) of \(\rm MgCl_{2}\) formula units.

Thus, the mass of \(1\; \rm mol\!\) of \(\rm MgCl_{2}\) formula units would be equal to the mass of \(1\; \rm mol\) of \(\rm Mg\) atoms plus the mass of \(2\; \rm mol\) of \(\rm Cl\) atoms. (The mass of \(1\; \rm mol\!\!\) of each atom could be found from the relative atomic mass of each element.)

\(\begin{aligned}& M({\rm MgCl_{2}}) \\ =\; & 24.305\; {\rm g \cdot mol^{-1}} + 2\times {\rm 35.45 \; \rm g \cdot mol^{-1}} \\ =\; & 95.205\; \rm g \cdot mol^{-1}\end{aligned}\).

In other words, the formula mass of \(\rm MgCl_{2}\) is \(95.205\; \rm g \cdot mol^{-1}\).

Therefore, the number of formula units in \(m = 24.2\; \rm g\) of \(\rm MgCl_{2}\) would be:

\(\begin{aligned}n &= \frac{m({\rm MgCl_{2}})}{M({\rm MgCl_{2}})} \\ &= \frac{24.2\; \rm g}{95.205\; \rm g\cdot mol^{-1}} \\ & \approx 0.254\; \rm mol\end{aligned}\).

Multiple \(n\) by Avogadro's Number \(N_{A} \approx 6.022 \times 10^{23}\; \rm mol^{-1}\) to estimate the number of formula units in \(0.254\; \rm mol\):

\(\begin{aligned}N &= n \cdot N_{A} \\ &\approx 0.254\; \rm mol \times 6.022 \times 10^{23}\; \rm mol^{-1} \\ &\approx 1.53\times 10^{23}\end{aligned}\).

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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A scientific method is a systematic approach to solving problems by collecting data, formulating hypotheses, and testing those hypotheses through experimentation.

Out of the options provided, (d) "Apple tree is not producing apples" is an example of a problem that could be solved using the scientific method.

To solve this problem, we can follow the scientific method by first making observations and gathering data on the apple tree's environment, such as the amount of sunlight, water, and nutrients it receives. Next, we can formulate a hypothesis, such as the lack of pollination or nutrient deficiency, and design experiments to test this hypothesis.

The experiments may involve changing the conditions of the apple tree's environment, such as adding nutrients or pollinating the tree, and observing the results. By collecting and analyzing the data from these experiments, we can come to a conclusion and make recommendations for how to improve the apple tree's productivity.

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The partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg (calculated by subtracting the partial pressure of water, 17.0 mm Hg, from the total atmospheric pressure, 750.0 mm Hg).

When a gas is collected over water, the presence of water vapor affects the total pressure observed. In this case, the total atmospheric pressure is given as 750.0 mm Hg, and the partial pressure of water vapor at 19.5°C is 17.0 mm Hg.

To determine the partial pressure of hydrogen, we need to subtract the partial pressure of water vapor from the total atmospheric pressure. Partial pressure refers to the pressure exerted by an individual gas component in a mixture. In this scenario, the collected gas is primarily hydrogen, with water vapor being the other component.

By subtracting the partial pressure of water vapor (17.0 mm Hg) from the total atmospheric pressure (750.0 mm Hg), we can find the partial pressure of hydrogen:

Partial pressure of hydrogen = Total atmospheric pressure - Partial pressure of water vapor

Partial pressure of hydrogen = 750.0 mm Hg - 17.0 mm Hg

Partial pressure of hydrogen = 733.0 mm Hg

Therefore, the partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg.

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it's Gram because why not

Hello, Tia! Mass is measured in kilograms or grams. It tells the amount of matter in an object.

Please give me brainliest for more high quality answers! - longstretch

Answer:

C

Explanation:its right

The correct structure that corresponds to the name 2,2,3-trichloro-3-fluorohexane is both. Thus option C is correct.

Chemical structure is defined as the physical configuration of atoms within a molecule. The molecular geometry of the molecule is determined by its chemical structure. By illustrating how the atoms and chemical bonds are arranged in space within the molecule, chemical structure can be used to establish the molecular geometry of a product. Chemists can now see a crucial visual depiction of a chemical formula thanks to this.

2,2,3-trichloro-3-fluorohexane structure given is both are correct as one of the structure is trans form and the other is cis form of the structure. Option A is trans form while option B is cis form of structure.

Thus, the correct structure that corresponds to the name 2,2,3-trichloro-3-fluorohexane is both. Thus option C is correct.

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Material from meteorites are not the elements used to make models of interstellar medium. The correct option is A.

The matter and radiation that prevail in the space between star systems in a galaxy are referred to as the interstellar medium in astronomy. This matter consists of gas including ionic, atomic, and molecular, dust, and cosmic rays.

Meteorite material is not used to create models of the interstellar medium.

Thus, the correct option is A.

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Answer:

d. C6H14 > C6H12 > C6H6

Explanation:

Standard molar entropy has to do with the number of atoms that are present in each of the species. The greater the number of atoms possessed by the species, the higher the value of the standard molar entropy due to a greater number of vibration modes.

Hexane (C6H14) has the highest number of atoms followed by cyclohexane (C6H12) and lastly benzene (C6H6).

Thus the order of decreasing molar entropy is;  C6H14 > C6H12 > C6H6.

Answer:

The element is Iron

Explanation:

ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.  Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials.

Remember that when a metal reacts with a nonmetal, often an ionic compound results from the transfer of electrons form the metal (the reductant) towards the nonmetal (the oxidant). Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials. They melt at rather high temperatures and are not easily distorted.   ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.

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The lead II carbonate is prepared from the lead II oxide and carbonic acid.

We know that salts can be prepared by some kind of chemical reactions. We also know that the salts of the metals are basic in nature. The meaning of this is that the oxide of the metal can be able to react with an acid so as to produce a salt.

In this case, we can be able to prepare the lead II carbonate when we add the lead II oxide to the carbonic acid, there is the production of the the required carbonate as a product of the reaction.

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Missing parts;

Starting with lead ii oxide powder describe how lead ii carbonate can be prepared. (preparation of salts)​

Answer: 2.88

Explanation:assume oxygen as O2, then 1 mole O2 = 2 moles H2O

so 2.88 moles O2

Any liquid or frozen water that condenses in the atmosphere and falls to the ground is referred to as precipitation. Rain, sleet, and snow are only a few of its various manifestations and evaporation.

Thus, Precipitation is one of the three main processes that make up the global water cycle, together with evaporation and condensation.

Water vapour in the clouds condenses into increasing-sized droplets of water, forming precipitation.

Particles of clean or smoke within the air are basic for precipitation. These particles, called “condensation nuclei,” give a surface for water vapor to condense upon.

Thus, Any liquid or frozen water that condenses in the atmosphere and falls to the ground is referred to as precipitation. Rain, sleet, and snow are only a few of its various manifestations and evaporation.

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Answer:

158 mL

158 mL of 0.1 M of HCl is required to react completely with 1 g mixture of Na2CO3 and NaHCO3, containing equimolar amounts of both

Explanation:

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The intermolecular forces or the strength of C is more than that of B.

What are intermolecular forces?

Here, we can see that C has dipole-dipole interaction while B has none.

Therefore, it states that the intermolecular forces present in C are much more than that in B.

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Answer:

The correct answer is d. 6H20 + 6CO2.

The reactant in the chemical reaction 6H2O + 6CO2 ---> C6H12O6 + 6O2 is 6H20 + 6CO2. Remember that the reactant is always at the left side of the equation. So the correct answer is 6H20 + 6CO2 since it's in the left of the equation. I hope this answer helped you.

Explanation:

Answer:

Amides are suitable to synthesize aniline

Explanation:

Amide are basically used to synthesize aniline.

The chemical formula of Aniline is C6H5NH2 while that of Amide is RCONH2

Amide are solids that can be easily converted to amines.

The correct answer is "C.

The type of exercise that Mei is doing is the "Machine exercise."

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The mass of 6.005 g of carbon contains approximately 3.011 x 10²³ carbon atoms.

We are aware that a mole is a grouping of 6.022 10²³ atoms. 6.0221023 carbon atoms make up a mole of carbon. As a result, we can estimate that 6.0221023 carbon atoms have a mass of 12 grammes.

There are: atoms of carbon in the sample.

The amount of carbon atoms in the sample may be determined using Avogadro's number (6.022 x 10²³ atoms per mole) and the molar mass of carbon (12.010 g/mol)

Number of moles of carbon = mass of carbon/molar mass of carbon

= 6.005 g / 12.010 g/mol

= 0.500 mol

Number of carbon atoms=number of moles of carbon x Avogadro's number

= 0.500 mol x 6.022 x 10²³ atoms/mol

= 3.011 x 10²³ atoms

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Percentage composition of a compound is the percentage by mass of each element presents in a compound. For instance is the percent by weight of the elements in a compound are given in percentage, they can be converted to masses.

These masses are converted to moles and its simplest multiple ratio is useful in determining the empirical formula of the molecule. The empirical formula is simply the simplest whole number ratio of atoms present in a compound.

The significance of empirical formula is that it helps us to determine the numbers and types of atoms composing a single molecule of the substance;

For instance, if a compound contains 5g of carbon, 2g of hydrogen and 12 grams of oxygen, the empirical formula is calculated using the steps below:

Step 1: Calculate the moles of the element

Mole = mass/molar mass

Moles of C = 5/12 = 0.42moles

Moles of H = 2/1 = 2moles

Moles of O = 12/16 = 0.75 moles

Step 2: Divide by the simplest mole ratio

For Carbon: 0.42/0.42 = 1(5) = 5

For hydrogen: 2/0.42 = 4.76(5) = 24

For Oxygen: 0.75/0.42 = 1.79(5) = 9

This shows that the empirical formula is C5H24O9

The general chemical reaction is expressed as:

The most likely option based on common knowledge is sunlight is reacting with waste gases produced by vehicles burning fossil fuels to produce photochemical smog.

Photochemical smog is a type of air pollution that is formed when sunlight reacts with pollutants released from vehicle exhaust and other sources, such as industrial emissions. This reaction produces a mixture of harmful chemicals, including ground-level ozone and various secondary pollutants.

However, it's important to note that a definitive answer would require specific information about the picture in question, as different scenarios may lead to different outcomes.

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Answer: C diamond has a different crystal structure from graphite

Explanation:

The difference between the properties of  two forms of carbon is that

Diamond has a crystal structure  different from graphite.

Graphite and Diamond are known as allotropes of Carbon as they have the

same chemical properties but different crystal structure.

Diamonds form a 3 crystal lattice with no flexibility while Graphite are

bonded to sheets which makes them slide easily within one another and

gives it its soft texture.

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