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Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of element x is 91.16759 amu.

The atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

Isotopes of the same element are those atoms where the atomic numbers are the same, but the number of neutrons is different.

The atomic mass of an element is the weighted average mass of its natural isotopes, taking into account the relative abundance of each of them.

In this case, you know:

Then, the average mass of the element x can be calculated as:

average mass= 89.90470 amu×0.5145 + 90.90565 amu×0.1122 + 91.90504 amu×0.1715 + 93.90632 amu×0.2018

Solving:

average mass= 91.16759 amu

Finally, the average atomic mass of element x is 91.16759 amu.

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Explanation:

it's because when CO₂ reacts with H₂O then it forms H₂CO₃ (carbonic acid), which is a acid that's why a compound formed by CO₂ and H₂O is sour.

Reaction:

CO₂ + H₂O → H₂CO₃

Answer:

8

Explanation:

Answer:

the answer is 8 :D

Explanation:

2x4 also known as 2+2+2+2 is equal to 8

Answer:

The main products are ATP, carbon dioxide, and water.

Answer:

b dissociate

Explanation:

Answer:

2Na + 2H2O ----> 2NaOH + H2

Explanation:

Answer:

the answer is 40% but, correct me if I'm wrong

Explanation:

Answer:

40%

Explanation:

Mass of carbon / total mass × 100

72/180× 100 = 40%

Answer:

competition

Explanation:

it would cause competition. both would fight for water and other stuff to grow and live

Answer:

Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Explanation:

The difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Temperature is the measure of cold or heat, often measurable with a thermometer while heat is the flow of thermal energy from a substance with higher temperature to that with a lower temperature.

Temperature is a scalar quantity while heat is a vector quantity. This suggests that temperature has no direction while heat posseses direction.

Therefore, the difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

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Answer:

200 kg

Explanation:

the 200 kg person is heavier due to gravity's force the 100 kg person has less force than the other person

Answer:

massive one that is 200kg

Explanation:

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

Answer:

If the fault develops in a situation of compression, then will be a first fault due to the fact that compression causes the hanging wall to be pushed up relative to the footwall.

Answer: When an atom becomes a positive ion it pulls it's electrons closer, decreasing it's radius moreover, when it becomes a negative ion, it pulls it's electrons closer and decreases the radius

I hope this helps :)

The monoatomic gas : He

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

P 380.9 mmHg = 0.5 atm

T 20 C+273 = 293 K

We can find molar mass of gas :

[tex]\tt M(molar~mass(M)=\dfrac{mRT}{PV}\\\\M=\dfrac{8~g\times 0.082\times 293~K}{0.5~atm\times 96~L}\\\\M=4~g/mol[/tex]

monatomic gas means a single element, usually a noble gas. The noble gas element with mass 4 is He

Answer:

Nepal is rich in biodiversity

Al is the limiting reactant and would run out quickly  and 357 g of aluminum oxide is produced.

The  limiting reactant is the reactant is the reactant that is present in the least amount in the system. This is the reactant that is going to run out most quickly. The limiting reactant would be the one that would determine the amount of product that is formed.

Now the reaction equation is shown in the image attached to the question above.

Number of moles of  Fe2O3 =  1.873 × 10^2 g /160 g/mol = 1.17 moles

Number of Al = 94.51 g Al/27 g/mol = 3.5 moles

If 1 mole of Fe2O3 reacts with 2 moles of Al

1.17 moles of Fe2O3 reacts with 1.17 moles  *  2 moles/ 1 mole

= 2.34 moles

Hence Al is the limiting reactant and would run out quickly.

Mass of aluminum oxide produced = 3.5 moles * 102 g/mol = 357 g

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Answer:

Heat is transferred from the warmer block to the cooler block

Explanation:

Heat transfer by conduction involves two or more solids. The heat generally moves from a part at higher temperature to one with a lower temperature.

The process of photosynthesis converts light energy into stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen.

Utilizing a process called photosynthesis, plants and other living things may transform light energy into chemical energy that can then be released through cellular respiration to power their activities. Photosynthesis, from the Greek phs (light) and synthesis (putting together), derives from the fact that some of this chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are created from carbon dioxide and water.

Photoautotrophic organisms, such as the majority of plants, algae, and cyanobacteria, carry out photosynthesis. The majority of the energy required for life on Earth is produced and maintained through photosynthesis, which is also primarily responsible for producing and maintaining the oxygen concentration of the Earth's atmosphere.

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Answer:

V₂ = 106.5 mL

Explanation:

Given data:

Initial volume =200 mL

Initial pressure = 2 atm

Initial temperature = 35 °C (35 +273 = 308 K)

Final temperature = 55°C (55+273 = 328 K)

Final volume = ?

Final pressure = 4 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 2 atm ×200 mL × 328 K / 308 K ×4 atm

V₂ = 131200 atm .mL. K / 1232 K.atm

V₂ = 106.5 mL

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.18 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 5.282392...[/tex]

We have the final answer as

Hope this helps you

Answer:

0.18× 10²³ molecules

Explanation:

Given data:

Mass of copper hydroxide = 3.30 g

Number of molecules = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 3.30 g/97.56 g/mol

Number of moles = 0.03 mol

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.03 mol × 6.022 × 10²³ molecules / 1mol

0.18× 10²³ molecules

Answer: A.ionic

Explanation:

Got it right

Answer:

Ionic

Explanation:

Answer:

The Plasma Membrane.

Explanation:

The eukoryotic cell is enclosed in a limiting membrane called the Plasma Membrane or Plasmalemma. ❤️

Explanation:

Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.

Answer:

Breaking or making of chemical bonds involves energy, which may be either absorbed or evolved from a chemical system. Energy that can be released or absorbed because of a reaction between a set of chemical substances is equal to the difference between the energy content of the products and the reactants, if the initial and final temperatures are the same.

Explanation:

Answer:

if the value of volume doubles but the mass stays the same, the value for density will be 1

Answer:

Li3PO4 + Sn(CH3COO)2 ------> LiSnPo4 + Li2(CH3COO)2

Explanation:

The limiting reactant​ : Fe

Reaction

3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂

mass of H₂O = 10 g

mol H₂O (MW=18 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]

mass of Fe = 16.8 g

mol Fe(MW=56 g/mol) :

[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]

Limiting reactant : the smallest ratio between mol : reaction coefficient

Fe :

[tex]\tt \dfrac{0.3}{3}=0.1[/tex]

H₂O :

[tex]\tt \dfrac{0.56}{4}=0.14[/tex]

Fe as limiting reactant