A 64. 8 g sample of the compound x2o5 contains 48. 0 g of oxygen atoms. What is the molar mass of element x?.

Answer:

Isotope 2

Explanation:

Isotope 2 is the most abundant. Its percent abundance is 78.68% which is the largest percentage, and therefore the most common of the isotopes presented.

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Answer:

Hydropower is fueled by water, so it is clean and doesn't produce pollution

Explanation:

Describe one advantage of using hydroelectric power plants over using coal-fired power plants. Hydropower is fueled by water, so it is clean and doesn't produce pollution while coal-fired power plants do produce pollution.

Answer:

The correct options are;

C. Divergent plate boundary

D. Normal faults

Explanation:

Tensile stress tends to pull objects part by acting axially upon the object to pull the object on a cross section perpendicular to the objects cross-section

The most common stress in convergent plate boundaries is compression stress

The most common stress in divergent plate boundaries is tensile stress

In the presence of tensile stress, normal faults results in the raising of mountains due to their enormous forces

Therefore, the features of Earth's crust involving tension are divergent plate boundary and normal faults.

Answer:c and d

Explanation:

In chemistry, according to Collision theory: It states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting.

There are two kinds of ions that are cation and anion. The former type is formed by metal by the loss of electrons whereas the latter type is formed by non-metal by the gain of electrons.

Group 16 of the periodic table contains the elements whose symbols are O, S, Se, Te, and Po. The generalized configuration of electrons in the nth...

Therefore, these elements will gain two electrons and become stable by achieving an inert gas configuration that is nearest to them. Thus, group 16 elements will form ions with a charge of -2.

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Answer:

First= Br O H [O is in the middle] Second= H N(double bond)S [N is middle] Third= H N Br Br [N is middle] Fourth= H C(Triple bond)N [C is middle]

Explanation:

Answer:

Explanation:

CH₃COOH(aq) + NaHCO₃(s) -> CO₂(g) + H₂O(l) + Na+(aq) + CH₃COO-(aq)

The equation is already balanced .

In the reaction acetic acid reacts with sodium bicarbonate to produce carbon dioxide gas , water and sodium acetate . Sodium acetate will be in ionic form ie in the form of Na⁺ ( sodium ion ) and CH₃COO ⁻ ion ( acetate ion ) .

This is an acid base neutralisation reaction . one mole of acetic acid reacts with one mole of sodium bicarbonate to produce one mole of carbon dioxide gas , one mole of water and one mole of sodium acetate in ionic form .

According to the given statement the vital capacity of an individual with an inspiratory reserve is 4625ml.

The additional air that is taken in with a vigorous breath in, above the tidal volume. As your tidal volume rises as a result of exercise, you have a reserve volume to draw from. Males typically have an expiratory reserve volume of 3000 mL, whereas females typically have 2100 mL.

VC = TV₊IRV₊ERV

where,

VC = Vital capacity

TV = Tidal volume

IRV = inspiratory reserve volume

ERV = expiratory reserve volume

VC = 525 ₊ 3200 ₊ 900

VC = 4625ml

Therefore, the vital capacity will be 4625ml.

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Lithium and bromine are created when lithium bromide is heated, according to the following skeleton equation: \(Li(s) + Br2 = LiBr(s) (g).\)

A skeleton equation is a condensed description of a chemical reaction that only displays the reactants and products—not their quantities or the circumstances under which the reaction takes place—of the process. It is a simple description of the reaction that can be used to pinpoint the components involved and the reaction's overall nature. A skeleton equation, however, does not fully describe the reaction because it does not account for the quantity of atoms or the charges of the ions involved. It is required to balance the equation, take into account the state and charge of each ion, as well as the reaction conditions, in order to completely comprehend the reaction.

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Answer:

Matter

hope this helps

Answer:

matter

Explanation:

Did the test

When filling a buret for a titration, first adjust the buret in the clamp so that it is vertical. Then, choose an appropriate funnel to add the titrant into the buret. The titrant should be filled to just above the zero mark on the buret, and the buret tip should be briefly opened to remove any bubbles.

After that, the buret can be adjusted to the desired volume and the titration can proceed. It is important to take note of the initial buret reading before starting the titration to ensure accurate measurement of the titrant volume.

When filling a buret for a titration, it is important to first adjust the buret in the clamp so that it is vertical and its tip is below eye level to ensure accurate volume measurements. Next, choose an appropriate method to add the titrant into the buret, such as using a funnel or a pipette.

It is important to avoid splashing or spilling the titrant to ensure accurate and precise measurements. The titrant should be filled above the zero mark on the buret and then slowly drained until the bottom of the meniscus is aligned with the zero mark.

This process is called "buret priming" and it helps to remove any air bubbles from the buret tip that can affect the accuracy of the measurements. Once the buret is primed and filled with the titrant, it is ready to be used for the titration.

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Answer:

Óxido de magnesio

Concepto:Es un óxido metálico, formado por magnesio y oxígeno, de estructura iónica cuya fórmula química es MgO.

The theoretical yield of the water in the reaction is 329.4 g.

We know that we can be able to obtain the theoretical yield when we look at the stoichiometry of the reaction that we have here. In this case, it is clear that would need to rely on the reaction equation and it would be our guide.

We have that;

2 moles of hydrogen would produce 2 moles of water

18.3 moles of hydrogen would also produce 18.2 moles of water.

Theoretical yield of water would now be;

18.3 * 18 g/mol

= 329.4 g

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Moles of Hydrogen gas collected : 0.127

The reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products

If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction

Reaction

Mg(s)+2HCl(aq)⇒H₂(g)+MgCl₂(aq)

mass of Mg=3.09 g

mol Mg (Ar= 24,305 g/mol) :

\(\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{3.09}{ 24,305}\\\\mol=0.127\)

Magnesium metal reacts with excess Hydrochloric acid, so Mg as a limiting reactant and moles of product is based on moles of Mg

From the equation, moles ratio Mg : H₂ = 1 : 1, so moles H₂ :

\(\tt \dfrac{1}{1}\times 0.127=0.127\)

1. 7.53 x 10^23 moles of neon.

2. 6.31 x 10^24 atoms of tungsten is equal to 1 mole of tungsten.

3. In 54 grams of water, there are approximately 4.5 x 10^23 atoms of hydrogen.

4. How many grams are in 12.3 moles of dinitrogen pentoxide?

5. The molar mass of carbon dioxide is 44.01 g/mol.

6. Aluminum oxide has a molar mass of 101.96 g/mol. Therefore, 0.87 moles of aluminum oxide would be 87.17 g.

7. At STP (standard temperature and pressure), 6 L of hydrogen gas contains 0.024 moles of hydrogen.

8. At STP, 10.26 moles of neon will occupy a volume of 24.03 liters.

9.

No, a human is not at risk of a reaction if they were stung with a 0.00056-gram amount of histamine. 0.00056 grams of histamine is only 8.64 x 1010 molecules, which is far less than the threshold of 3.4 x 1015 molecules necessary to cause a reaction.

10. MgS2O6

i gotchu bro here you go

He will arrive at the second city on time

Using the formula for calculating speed expressed as:

Distance = Speed * time

Given the following parameters

Speed = 65km/hr

Time = 3 hours (from noon to 3PM)

Get the distance covered by Isaiah;

Distance = 65 * 3

Distance = 195km > 186km

Since the distance covered by Isaiah is greater than the distance from one city to another city, hence he will arrive at the second city on time

What is Speed?

The speed at which an object's location changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.

Therefore,

186km at 3:00 the speed limit is 65km/h

He will arrive at the second city on time

Using the formula for calculating speed expressed as:

Distance = Speed * time

Given the following parameters

Speed = 65km/hr

Time = 3 hours (from noon to 3PM)

Get the distance covered by Isaiah;

Distance = 65 * 3

Distance = 195km > 186km

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Answer:

9.03 x 10²³atoms

Explanation:

Given parameters:

Number of moles of CO₂  = 1.5mol

Unknown:

Number of atoms  = ?

Solution:

In a mole of a substance, we have the Avogadro's number of particles which is 6.02 x 10²³atoms.

  Using this number, we can determine the amount of atoms in any substance.

If;

       1 mole of CO₂ contains 6.02 x 10²³ atoms;

     1.5mole of CO₂ will contain 1.5 x 6.02 x 10²³ atoms

                                                = 9.03 x 10²³atoms

Answer:

The correct answer is Choice D.

(Headaches or backaches)​

Explanation:

Hope this helps!

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Answer:       electron on the shell  of the atom

Explanation:  that what I trying to remember

The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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Answer:

today, petroleum is mostly used as a source of energy, being rich in combustible carbon in the production of electricity or running some sorts of heat engines. ... Raw petroleum (also known as crude oil) is used in three major ways: Transportation, Electricity Generation, and Material Production.

Explanation:

hope it helps!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:

basalt

Explanation:

it’s rough on skin

Answer:

the awnser is reactants

Answer:

hoy

Explanation:

Answer:

39.215g

Explanation:

Molae mass means mass in 1 mole.

If 78.430g is in 1 mole

Xg is in 0.5 mole

cross multiply

X x 1 = 78.430 x 0.5

X = 39.215 g

Answer:

47.72%

Explanation:

3.98/8.34 x 100 = 47.72%

Explanation:

Soap solution is called a mixture because you're combining a ratio of liquid soap and water to make a mixture.

Answer:

3.34x10¹⁶ molecules of aspirin are in a drop of blood

Explanation:

The recomended dose of aspirin in blood is 100.0μg/mL =

1x10⁻⁴g aspirin / mL of blood.

In a drop (0.100mL) there are:

0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.

Molecular mass of aspirin is:

9C = 12.01g/mol ₓ 9 = 108.09g/mol

8H = 1.01g/mol ₓ 8 = 8.08g/mol

4O = 16g/mol ₓ 4 = 64g/mol

108.09 + 8.08 + 64 = 180.17g/mol

Thus, moles of aspirin in 1x10⁻⁵g are:

1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin

In 1 mole, you have 6.022x10²³ molecules, thus:

5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =

According to the ionic bonding model, the compound with the highest melting point is likely to be the one with the strongest ionic bonds.

In the ionic bonding model, compounds form when there is a transfer of electrons from one element to another, resulting in the formation of positive and negative ions. The strength of the ionic bond is influenced by factors such as the charges and sizes of the ions involved.

Among the given compounds, MgO (magnesium oxide) is expected to have the highest melting point. This is because magnesium (Mg) is a metal that tends to lose two electrons and form a 2+ cation, while oxygen (O) is a nonmetal that tends to gain two electrons and form a 2- anion. The resulting Mg2+ and O2- ions have strong electrostatic attraction due to the opposite charges. This strong ionic bond requires a significant amount of energy to break, leading to a high melting point for MgO.

On the other hand, compounds like AlN (aluminum nitride), NaCl (sodium chloride), CaS (calcium sulfide), and RbI (rubidium iodide) also exhibit ionic bonding but with different ion sizes and charges. While these compounds have varying degrees of ionic bonding strength, they are expected to have lower melting points compared to MgO.

In conclusion, based on the ionic bonding model, MgO (option B) is likely to have the highest melting point among the given compounds due to its strong ionic bond resulting from the combination of a 2+ metal cation and a 2- nonmetal anion.

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The major product for the given reaction is (2-methylbutan-2-ol). The given reaction is an example of dehydration of alcohol.

Here's the mechanism of the reaction:Step 1: Protonation of the alcohol: The lone pair of electrons on oxygen is protonated by HCl. A proton from HCl is transferred to oxygen to form an oxonium ion.Step 2: Removal of water: The C-O bond breaks down in the oxonium ion, giving an intermediate carbocation. The electrons on the neighboring oxygen atom are used to form a double bond with the carbon. The leaving group (water molecule) is lost during this process.

Step 3: Deprotonation: The carbocation formed is then deprotonated by the water molecule that is present in the solution. A water molecule acts as a base and takes up a proton from the carbocation to form 2-methylbut-2-ene.Step 4: Protonation and deprotonation: The formation of 2-methylbut-2-ene is favored because it is more stable than the carbocation intermediate formed in the reaction. However, the reaction is reversible, and if more water is added to the reaction mixture, the double bond is protonated by water to form 2-methylbutan-2-ol.

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Answer:

Sorry pal! Didn't understand your language.  

:(

Explanation:

Answer:

The element was one of the alkaline metals, the dull appearance comes from the metal reacting with oxygen and oxidizing its outer surface as alkaline are known for their enormous reaction with oxygen in the air and water.

Another ability of this group of elements is the ability to conduct electricity. And they are also easy to cut with a kitchen knife.

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of PbCl\(_2\) is 19.6g.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

NaCl + Pb (NO\(_3\)) \(_2\)(aq)  → PbCl\(_2\) (s) ↓  + 2 NaNO\(_3\) (aq)

Mass of NaCl =15.90 Grams

Mass of  Pb (NO\(_3\)) \(_2\)=12.10grams

According to law of conservation f mass

mass of reactant = mass of product

Substituting the values we get

15.90g +  12.10g = mass of PbCl\(_2\)+ 8.40g

mass of PbCl\(_2\) =19.6g

Therefore the mass of PbCl\(_2\) is 19.6g.

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