2 Pb(NO3)2(s) → 2 PbO(s) + 4 NO2(g) + O2(g)
15. Solid lead(II) nitrate can be decomposed by heating. If an actual yield of 5.51 g PbO product is
recovered by heating 9.90 g Pb(NO3)2. what is the percent yield of PbO in the decomposition
reaction?
A 98.0%
B. 82.6%
C. 78.49
D. 55.79

Answer:

D, E, A, B, C

Explanation:

The weakest base would be Cl- because HCl is a stronger acid than that of H3O+ from which the water is formed.

Also, for NH3 is a stronger acid than +NH4. Reason is that oxygen is more electronegative than nitrogen and thus NH3 is a stronger acid than NH4+.

The stronger, the acid, the weaker its conjugate base. Thus, NH3 is a weaker base than NH4.

NH2- has the highest basicity because nitrogen is less of an electronegative element than is oxygen. Therefore, it will not want a negative charge.

Hence, the final order in terms of increasing basicity is;

Cl-, H20, NH3, NH4, NH2-

Answer:

Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element's symbol

Answer:

Answer:

phase change always has two phases in contact during the change. melting => solid & liquid; evaporation (boiling) => liquid & vapor. If only one phase is present, then phase change is not occurring. Also, when two phases are in contact, no temperature changes occur. Only the pure phase demonstrates temperature change when measured. Example, when ice is added to water, at thermal equilibrium (temp = 0°C) the water temp will not continue to change. Only when all the ice has melted will the water temperature demonstrate a measured temperature change.

Explanation:

Answer:

It’s d

Explanation:

It’s d 100%

Answer:

helped

The number  of ml of isopropyl  alcohol  that are 1 pint (473 Ml)   is  331.1 Ml

  calculation

assume  that  the 1 pint  is in  a  container

  This implies  that the 1 pint (473 ml)  is  in 100 %  M/V

     what about 70 %(M/V)

that is  473 Ml  = 100 %

                  ?   =   70 %

by  cross  multiplication

   =  473 x70/100 = 331.1 Ml

Explanation:

Answer:

Shorter

Explanation:

As a wavelength increases in size, its frequency, and energy (E) decrease. From these equations, you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer. There are two basic types of waves: mechanical and electromagnetic.

Answer:

71.99100

Explanation:

The mass of oxygen equal to one mole of oxygen is 15.998 grams and the mass of one mole of hydrogen is 1.008 g. 15.998*4.5 = 71.99100

Answer:

Explanation:

1,2,1,2

Answer:

b

Explanation:

Answer:

Adding fluoride to the water supply reduces the incidence of tooth decay. Fluoride protects teeth from decay by demineralization and remineralization. Too much fluoride can lead to dental fluorosis or skeletal fluorosis, which can damage bones and joints.

Explanation:

N/A

Answer:

Explanation:

the income effect is the change in demand for a good or service caused by a change in a consumer's purchasing power resulting from a change in real income. This change can be the result of a rise in wages etc., or because existing income is freed up by a decrease or increase in the price of a good that money is being spent on.

Answer:  a proportional change in quantity demanded based on income

Explanation:

Answer:

solvent

Explanation:

Answer:

[tex]0.5594\ \text{L}[/tex]

Explanation:

Mol of NaI = 0.405 mol

Molarity of solution = 0.724 M

Molarity is given by

[tex]M=\dfrac{\text{mol}}{\text{Volume of solution in }NaI}\\\Rightarrow \text{Volume of solution in }NaI=\dfrac{0.405}{0.724}\\\Rightarrow \text{Volume of solution in }NaI=0.5594\ \text{L}[/tex]

The required volume is [tex]0.5594\ \text{L}[/tex].

Answer:

Blue: Because violet really has the most and blue is based on violet!

Explanation:

Hope this helps! Plz mark as brainliest!

Answer:

The answer is C!

Explanation:

Hope it helps

Answer D

Explanation: did the quiz ψ(｀∇´)ψ

Answer:

B. a difference in temperatures.

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles.

Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

In order for heat to flow there must be a difference in temperatures.

This ultimately implies that, the driving force responsible for heat to flow is a difference in temperature between the points from which heat originates and where heat is received.

Additionally, the higher the temperature difference, the greater would be the heat flow; which is usually from a high temperature level to a low temperature level.

Answer: since the sodium ion is Na+, and sulfate is SO4(2-), you'll need 2 sodiums for a sulfate, making sodium sulfate Na2SO4.

Explanation:

The number of atoms present in 591 g of gold is 1.81×10²⁴ atoms

From Avogadro's hypothesis,

1 mole of Gold = 6.02×10²³ atoms

But

1 mole of gold = 197 g

Thus,

197 g of gold = 6.02×10²³ atoms

197 g of gold = 6.02×10²³ atoms

Therefore,

591 g of gold = (591 × 6.02×10²³) / 197

591 g of gold = 1.81×10²⁴ atoms

Thus, 1.81×10²⁴ atoms is present in 591 g of gold.

Learn more about Avogadro's number:

https://brainly.com/question/26141731

Answer:

E. Enthalpy is an intensive property Is false.

Explanation:

The false or wrong option in this question is that Enthalpy is an intensive property.

To explain this, I would first explain an intensive property. An intensive property is one that does not depend on the quantity or the mass of matter. Examples are temperature and pressure.

But an extensive property is a property which depends on the mass and the quantity of the system. Enthalpy, volume are all extensive.

Answer:

ammonia is a common base

Answer:

where is the structure the picture

Explanation:

???

Answer:

The stratosphere

Explanation:

The question is incomplete. The complete question is :

A common "rule of thumb" for many reactions around room temperature is that the rate will double for each ten degree increase in temperature. Does the reaction you have studied seem to obey this rule? (Hint: Use your activation energy to calculate the ratio of rate constants at 300 and 310 Kelvin.)

Solutions :

If we consider the activation energy to be constant for the increase in 10 K temperature. (i.e. 300 K → 310 K), then the rate of the reaction will increase. This happens because of the change in the rate constant that leads to the change in overall rate of reaction.

Let's take :

[tex]$T_1=300 \ K$[/tex]

[tex]$T_2=310 \ K$[/tex]

The rate constant = [tex]$K_1 \text{ and } K_2$[/tex] respectively.

The activation energy and the Arhenius factor is same.

So by the arhenius equation,

[tex]$K_1 = Ae^{-\frac{E_a}{RT_1}}$[/tex]  and [tex]$K_2 = Ae^{-\frac{E_a}{RT_2}}$[/tex]

[tex]$\Rightarrow \frac{K_1}{K_2}= \frac{e^{-\frac{E_a}{RT_1}}}{e^{-\frac{E_a}{RT_2}}} $[/tex]

[tex]$\Rightarrow \frac{K_1}{K_2}= e^{-\frac{E_a}{R}\left(\frac{1}{T_1}-\frac{1}{T_2}\right)}$[/tex]

[tex]$\Rightarrow \ln \frac{K_1}{K_2}= - \frac{E_a}{R} \left(\frac{1}{T_1} -\frac{1}{T_2} \right)$[/tex]

[tex]$\Rightarrow \ln \frac{K_2}{K_1}= \frac{E_a}{R} \left(\frac{1}{T_1} -\frac{1}{T_2} \right)$[/tex]

Given, [tex]$E_a = 0.269$[/tex] J/mol

           R = 8.314 J/mol/K

[tex]$\Rightarrow \ln \frac{K_2}{K_1}= \frac{0.269}{8.314} \left(\frac{1}{300} -\frac{1}{310} \right)$[/tex]

[tex]$\Rightarrow \ln \frac{K_2}{K_1}= \frac{0.269}{8.314} \times \frac{10}{300 \times 310}$[/tex]

[tex]$\Rightarrow \ln \frac{K_2}{K_1}= 3.479 \times 10^{-6}$[/tex]

[tex]$\Rightarrow \frac{K_2}{K_1}= e^{3.479 \times 10^{-6}}$[/tex]

[tex]$\Rightarrow \frac{K_2}{K_1}= 1$[/tex]

∴ [tex]$K_2=K_1$[/tex]

So, no this reaction does not seem to follow the thumb rule as its activation energy is very low.