I need help with this i need help by sb

Answer:

You can get to the answer in two steps:

calculate: 3.40⋅1022 atoms = x mol ?

using Avogadro's constant.

calculate: x mol = ? grams,

using the atomic mass of Helium.

Step 1

Avogadro's constant says that 1 mole of any atom contains 6.022⋅1023 atoms. In this case you have 3.40⋅1022 atoms:

3.40⋅1022atoms6.022⋅1023atomsmol = 5.65⋅10−2mol

Step 2

The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 gram:

4.00gmol⋅5.65⋅10−2mol = 0.226g

So the 3.40⋅1022 helium atoms weigh 0.226 gram.

Apply combine gas law

So

[tex]\\ \rm\Rrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{P1(0.722)}{296.3}=\dfrac{0.481(2.055)}{353}[/tex]

[tex]\\ \rm\Rrightarrow 0.0024P1=0.0028[/tex]

[tex]\\ \rm\Rrightarrow P_1=1.167atm[/tex]

D

From the calculations, the equilibrium constant of the reverse reaction is 2.22 * 10^3.

The term equilibrium constant refers to a number that shows the extent to which reactants are converted into products.

We can see that the equation is COCI₂(g) CO(g) + Cl₂(g) having Kc = 0.00045. The equilibrium constant of the reverse reaction is; 1/0.00045 = 2.22 * 10^3.

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Answer:

Explanation:

Net ionic equations must be balanced by both mass and charge. Balancing by mass means ensuring that there are equal masses of each element on the product and reactant sides. Balancing by charge means making sure that the overall charge is the same on both sides of the equation.

Answer:

Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol

Explanation:

First, collect the individual molar masses of each element. These values are found on the periodic table under each respective element.

Chromium (Cr): 51.996 g/mol

Phosphorus (P): 30.974 g/mol

Oxygen (O): 15.999 g/mol

The quantity of each element is determined by the subscript next to it. If their is a subscript directly to the right of a set of parentheses, multiply each element within the parentheses by the subscript.

Chromium (Cr): 4

Phosphorus (P): 1 x 3 = 3

Oxygen (O): 4 x 3 = 12

Finally, the total molar mass of the compound is the collective molar masses of each element times the quantity of each element.

Molar Mass (Cr₄(PO₄)₃): 4(51.996 g/mol) + 3(30.974 g/mol) + 12(15.999 g/mol)

Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol

Answer:

It contains 6.02*10^23 molecules

Explanation:

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Answer:

≈170.22 [gr].

Explanation:

1) M(Cu₂CO₃)=2*64+12+3*16=188 [gr/mol];

2) the part of copper in Cu₂CO₃ is:

[tex]\frac{64}{188} =\frac{16}{47};[/tex]

3) 16/47% of 500 [gr] is:

[tex]500*\frac{16}{47}=170.22[gr].[/tex]

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It's decomposition reaction.

[tex] \sf{Explanation}[/tex]

As, we can see in the above reaction, [tex] H_{2} O[/tex] is broken down into [tex] H_{2} [/tex] and [tex] O_{2} [/tex].

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For an engine whose displacement is listed as 430 in.², the engine piston displacement in liters is mathematically given as

PD= 7.37 L  

Generally, the equation for the dimensional analysis method,\, we convert in to L is mathematically given as

l*(v/l)*l/v

Therefore,  piston displacement

PD=(450 in3) . (1 dm3 / 61.024 in3) . (1 L / 1 dm3)

PD= 7.37 L  

In conclusion, piston displacement

PD= 7.37 L  

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Answer is NH4NO3

YOU HAVE WRITTEN WRONG IN OPTION NO. A

EXPLANATION

Answer:12668 J.

Explanation:

First of all, steam is there so in order to convert it into water it must have to release latent heat of vaporization which is equal to approximately 2450 kJ/kg or 2450 J/g.

So, the calculation is given below.

Heat released during conversion of steam at 100°C to water at 100°C= m*L

= 5*2450= 12250 J.

Heat released during conversion of water at 100°C to water at 80°C= m*Cp*(∆T)

= 5*4.18*20= 418 J.

So total heat released= 12668 J.

hope this helps:)!!!

The heat energy released or absorbed by a system can be calculated using calorimetric equation. The heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33858 J or 338 KJ.

Calorimetry is an analytical tool used to determine the heat energy q absorbed or released in a reaction system. The calorimetric equation connecting mass of the reactant m, specific heat capacity c and temperature difference ΔT is related by the expression:

q = mcΔT.

The mass of steam is given 60 g and temperature difference is from 235 to 100 °C thus 135 °C and the specific heat capacity of  water or steam is 4.18 J/°C. The heat energy released is calculated as follows:

q = 60 g × 4.18 J/°C × 135 °C

  = 33858 J

Hence, heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33585 J.

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Explanation:

heat energy is another name for thermal energy

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The nucleus of an atom of the element is positively charged and atom has a hollow space inside it.

Explanation:

This experiment was conducted by Rutherford in this experiment. He placed a gold foil and surround it with a screen.

And He exposed gold foil in alpha particles rays in which he noticed that most rays passed through atom which conclude that atom has a large space, some rays get deflected and some reverse their path this show that the positive charge of nucleus of an atom.

Answer:

B is the answer. 2.00 x 10^5 ppm

Explanation:

Right on edmentum

Answer:

Nitrous Oxide

Explanation:

The Gibbs free energy describes the spontaneity of the chemical reaction. The reaction involving nitroglycerine is spontaneous.

Spontaneity is the condition of the reaction that continuously makes the product without adding input energy again and again. It is determined by the Gibbs free energy of the system.

When the Gibbs free energy of the thermodynamic system is negative then the reaction is said to be exothermic and is a spontaneous reaction. The negative Gibbs free energy of nitroglycerine at 273 K shows spontaneity.

Therefore, the reaction is spontaneous.

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The repeating unit in this polymer is  −CH2−CCl2 (i.e., Methylene-Dichlorocarbene).

In chemistry, a polymer is a molecule and/or structure composed of two or more repeating units.

These repeating units can be very reactive in a single composition or form a polymer when bound.

In conclusion, the repeating unit in this polymer is  −CH2−CCl2 (i.e., Methylene-Dichlorocarbene).

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Answer:

Products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state. This process results in the consumption of the reactants.

Explanation:

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Answer:

DNA sequence

Explanation:

When we say our DNA is different , we mean the sequence, or coding,  of DNA is different

Answer:

Friction also prevents an object from starting to move, such as a shoe placed on a ramp. When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.

Friction is involved in energy transformation considering the fact that When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.

Friction also prevents an object from starting to move, such as a shoe placed on a ramp.

In other words, opposing force is known as friction. The type of friction that acts on an object that is not moving is static friction.

Static friction serves as a kind of friction that do occur between two object that are not moving which means the object are static in nature.

Thats why during rainy season while walking on slippery roads people wear shoes with spikes which prevents a person from slipping into mud by the action of friction.

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Answer:

their citrus clouds

Explanation:

I looked it up on the internet

The new volume of the methane gas would be 113 atm

At constant temperature, the pressure of a gas is inversely proportional to its volume.

Mathematically; P1V1 = P2V2 where P1 = initial pressure, P2 = final pressure, V1 = initial temperature, and V2 - final temperature.

In this case, V1 = 226 [tex]cm^3[/tex],  P2 = 2P1

Thus: V2 = P1V1/2P1 = V1/2 = 226/2 = 113 atm

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Answer:

The BP increases in temperature as you move down the halogen group ( group 7)

Answer:

The trend of boiling points in the the table vary according to the size of the elements atom, if an element has a larger size it will need greater intermolecular forces and heat to break the strong bonds. Therefore Bromine has a larger size followed by chlorine and later fluorine, and this has shown in their boiling points

Answer:

Compact cars with smaller engines can't achieve more than 30 mpg because of the weight difference

Hope This Helped

Answer:

electrostatic force

Explanation:

The solubility product of the substance MS in water is 2.0 * 10^-8.

The solubility product is an equilibrium constant that shows the extent to which a solid is dissolved in water.

In this case, the equilibrium is; MS(s) = M²+ (aq) + S²-(aq) but M²+ (aq)] = S^2-(aq)] = 0.000143 mol L-¹.

Thus

Ksp = [0.000143 ]^2 = 2.0 * 10^-8

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Answer:

4 covalent bonds

Explanation:

Each carbon atom can form as many as four covalent bonds with other carbon atoms as well as with other elements. Be able to explain why this is so. Be able to list the four main groups of organic molecules and their functions in living things.