How many moles of NO2 form when
63.25 g N2O5 decompose?

2N₂O54NO₂ + O₂

2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag

mol Ag = 7.08 : 108 g/mol = 0.065

the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ

(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag

Answer:

1.25 g C3H8

Explanation:

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Answer:

The air flow carries away the carbon dioxide formed during the decomposition. Once accumulated in the furnace or if the air was not allowed to stream through, it begins to react again with the newly formed calcium oxide, equilibrating rather than completing the reaction.

Answer:

49 moles of atoms

Explanation:

There are 7 individual atoms in each molecule of H2SO4:  (2 hydrogens + 1 sulfur + 4 oxygens).

Therefore, if 7 moles are decomposed, there would be 7 times that amount of individual atoms:

7 x 7 = 49 moles of atoms

Answer: C

Explanation:

A) There is 1 fewer hydrogen atom.

B) There are 2 fewer carbon atoms.

D) There is 1 extra hydrogen atom.

Answer:

1. Oxygen - 46.1%

2. Silicon - 28.2%

3. Aluminium - 8.23%

4. Iron - 5.63%

5. Calcium - 4.15%

6. Sodium - 2.36%

7. Magnesium - 2.33%

8. Potassium - 2.09%

9. Titanium - 0.565%

10.Hydrogen -0.140%

Explanation:

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Answer:

79.7%

Explanation:

Percentage yield = (actual yield/theoretical yield)*100%

Therefore percentage yield for this experiment is: [tex]\frac{192}{241} *100%[/tex]%

[tex]= 0.79668*100[/tex]%

Percentage yield = 79.668%

Rounded to 3 significant figures is 79.7%

Hope this helped!

Answer:

one mole contains exactly 6.022 14076 into 10 23 elementary this number is the fix numerical value of the evandi and the constant and a b where expects in the unit mol - 1 is called the abacation number that amount of substance of a system is measured of the number specific

Answer:

Solution. Carbonic acid is a dibasic acid with two replaceable hydrogen ions; therefore it forms one acid salt or one normal salt. Hydrochloric acid is a monobasic acid with one replaceable hydrogen ion and so forms only one normal salt.

Explanation:

Answer: Are people happier if they have more spare time?

Explanation:

Happiness cannot be measured quantitatively.

The evidence indicate that the reaction has occurred between ions i.e, change of state of the reactants, e.g. precipitation.

In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution.

The reaction of the ions can be checked by a number of methods.

In a chemical reaction, the ions are in the acqeuos solution which means that they are in solution, dissolved with charge.

During the reaction (ionic) there is an attraction between the positive and negative ions.

This makes a change in the state of the reactants in the products.

In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.  

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Methane was unusually high is the correct option. Hence, option B is correct.

Methane is the simplest member of the paraffin series of hydrocarbons and is among the most potent greenhouse gases. Its chemical formula is [tex]CH_4[/tex].

As the ice compacts over some time, tiny bubbles of the atmosphere or surroundings including greenhouse gases like carbon dioxide and methane—press inside the ice. These air pocket “fossils” give samples of what the atmosphere was kind when that layer of ice formed.

Based upon past studies and insights from current GHG levels, we assume that atmospheric levels of carbon dioxide and methane were unusually low.

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From the  highest to lowest Ionization Energies for beryllium, calcium, magnesium, and strontium, the order is:  Be > Mg > Ca > Sr

Ionization energy is defined as a measure of the difficulty in removing an electron from an atom or ion or the tendency of an atom or ion to give off an electron.

Now, ionization energy usually decreases as it descends in a group.  Thus, from the  highest to lowest for beryllium, calcium, magnesium, and strontium, the order is determined as:

Be > Mg > Ca > Sr

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Answer: B (BE > MG > CA > SR)

Explanation: ON EDGE

Answer:

halogen

Explanation:

group 17 contains halogens

Answer:

The group 17 falls int he halogen category the element most likely Fluorine Chlorine Bromine Tennessine

Explanation:

0.889 ÷ 4187 ÷ 0.124 = 0.00171

Answer:

4.5 moles H₂O

       or

81.072 g H₂O

Explanation:

I am not exactly sure whether you want moles H₂O or grams H₂O. So, I'll calculate both. To find the moles H₂O, you'll need to covert moles C₈H₁₈ to moles H₂O via the mole-to-mole ratio from the reaction coefficients. To find the grams H₂O, you need to convert moles H₂O to grams H₂O via the molar mass.

2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O

0.5 mole C₈H₁₈          18 moles H₂O
-----------------------  x  -------------------------  = 4.5 moles H₂O
                                  2 moles C₈H₁₈

Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol

Molar Mass (H₂O): 18.016 g/mol

4.5 moles H₂O         18.016 g
----------------------  x  ----------------  =  81.072 g H₂O
                                  1 mole

No, all wavelengths/photons of light are emitted from excited electrons.

Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.

When an atom's electrons move to a lower energy state, the atom releases energy in the form of a photon. Depending on the energy involved in the emission process, this photon may or may not occur in the visible range of the electromagnetic spectrum.

Hence, no, all wavelengths/photons of light are emitted from excited electrons.

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The magnetic force experienced by a proton moving with a speed of 3 ×[tex]10^{5}[/tex] m/s in the magnetic field B of magnitude 6 ×[tex]10^{-5}[/tex] T will be 2.88×[tex]10^{-18}[/tex] N.

Magnetic force can be defined as the attraction or repulsion force that arises between electrically charged particles due to the motion of the charged particles.

Given,

Speed = 3×[tex]10^{5}[/tex] m/s

Magnetic Field, B= 6 ×[tex]10^{-5}[/tex] T

Magnetic force is the product of velocity, the charge of a proton, and the magnetic field present there.

The magnetic force can be represented as:

F=qvB

F=1.6×[tex]10^{-19}[/tex]×3×[tex]10^{5}[/tex] ×6 ×[tex]10^{-5}[/tex]

F=2.88×[tex]10^{-18}[/tex] N

Hence, the magnetic force experienced by the proton will be 2.88×[tex]10^{-18}[/tex] N.

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Answer:

They are unstable as single atoms, but can become stable by losing or sharing their one valence electron.

Explanation:

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Explanation:

You may not realise it, but you come across aldehydes and ketones many times a day. Take cakes and biscuits, for example. Their golden, caramelised crust is formed thanks to the Mailliard reaction. This is a process that occurs at temperatures above 140° C, when sugars with the carbonyl group in foods react with nucleophilic amino acids to create new and complex flavours and aromas.

Another example is formaldehyde. Correctly known as methanal, it is the most common aldehyde in industry. It has multiple uses, such as in tanning and embalming, or as a fungicide. However, we can also react it with different molecules to make a variety of more useful compounds. These include polymers, adhesives and precursors to explosives. But how do aldehydes and ketones react, and why?You should remember from Aldehydes and Ketones that they both contain the carbonyl functional group , . This is a carbon atom joined to an oxygen atom by a double bond. Let's take a closer look at it.

If we compare the electronegativities of carbon and oxygen, we can see that oxygen is a lot more electronegative than carbon.

Answer:

Sink

Explanation:

For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that [tex]25/7 > 1[/tex], so the substance would sink.

Reduction involves the either the addition of hydrogen and removal of oxygen.

Reduction involves the removal of oxygen.

This implies there is a loss of oxygen in reduction.

This can be represented in the extraction of iron from it ores.

Fe₂O₃ + 3CO →  2Fe + 3CO₂

Reduction is also the addition of hydrogen. This implies it is the gain of hydrogen.

For example

CH₃CHO → CH₃CH₂OH

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Answer:

CsCl

Explanation:

The ionic species are:

           Cs⁺   and Cl⁻

Answer: 40. mol (to 2 sf)

Explanation:

Since there are 9 oxygen atoms in every molecule of aluminum nitrate, this means that there are 9 moles of oxygen atoms in each mole of aluminum nitrate.

So, in 4.4 moles, there are 9(4.4) = 40. mol (to 2 sf)

Answer:

223 g O₂

Explanation:

To find the mass of oxygen gas needed, you need to (1) convert moles Al to moles O₂ (via the mole-to-mole ratio from reaction coefficients) and then (2) convert moles O₂ to grams O₂ (via the molar mass). When writing your ratios/conversions, the desired unit should be in the numerator in order to allow for the cancellation of the previous unit. The final answer should have 3 sig figs because the given value (9.30 moles) has 3 sig figs.

4 Al + 3 O₂ ----> 2 Al₂O₃
^         ^

Molar Mass (O₂): 32.0 g/mol

9.3 moles Al          3 moles O₂              32.0 g
-------------------  x  ---------------------  x  --------------------  =  223 g O₂
                              4 moles Al               1 mole

Explanation:

Answer:

Mendeleev left blank spaces in his version of the periodic table because he left the gaps to place elements not known at the time