Briefly explain why sublimation occurs.

Answers

Answer 1

Answer:

Answer:

Sublimation is basically cause by the heat absorption and this process is an endothermic since it require extra energy.

It basically provide sufficient energy to molecules to control the various type of attractive forces from the neighbors and then convert it into the vapor phase.

Sublimation occur when the particle of gases become cold because some substances has high vapor pressure. Sublimation is the endothermic change and it occur below the triple point in terms of pressure and temperature.

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A Carbon-10 nucleus has 6 protons and 4 neutrons. Through radioactive beta decay, it turns into a Boron-10 nucleus, with 5 protons and 5 neutrons, plus another particle. What kind of additional particle, if any, is produced during this decay

Answers

Answer:

No additional particle was produced during the decay.

Explanation:

The equation of decay is given as;

¹⁰₆C + ⁰₋₁ e → ¹⁰₅B + x

To identify x, we have to calculate its atomic and mass number.

In the reactants side;

Atomic Number = 6 + (-1) = 5

Mass number = 10 + 0 = 10

In the products side;

Atomic Number = 5 + x

Mass Number = 10 + x

Generally, reactant = product

Atomic Number;

5 = 5 + x

x = 5 - 5 = 0

Mass Number;

10 = 10 + x

x = 10 - 10 = 0

This means no additional particle was produced during the decay.

(e) Which sample contains more atoms: 2.0 g of Fe2O3 or 2.0 g of CaSO4? Support your answer with calculations.

Answers

CaSO4. It has 6 atoms while Fe2O3 has 5 atoms

Explanation:

Fe2O3 contains 2 atoms of Iron(Fe) and 3 atoms of Oxygen(O) = 2 + 3 = 5 atoms

CaSO4 contains 1 atom of Calcium(Ca), 1 atom of Sulphur(S) and 4 atoms of Oxygen(O) = 1 + 1 + 4 = 6 atoms

Partc. explain why equal volumes of 0.1 m ch3cooh and 0.1 m nach3co2 function as a buffer solution, but equal volumes of 0.1 m hcl and 0.1 m naoh do not.

Answers

Answer : As per the definition of the buffer solution "It is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa".

so considering the above given condition for $CH_(3) COOH$ and $NaCH_(3)CO_(2)$ act as buffer because it satisfies and qualifies the conditions of behaving as a buffer when mixed in equal amounts,

whereas HCl and NaOH are strong acid and strong base which does not satisfies the criteria for being called as buffer.

As buffer needs a weak acid and its conjugate base to behave and act as buffer and resist any pH change.

The heat capacity of chloroform (trichloromethane,CHCl3)in the range 240K to 330K is given
byCpm/(JK-1mol-1) = 91.47
+7.5x10-2(T/K). In a particular experiment,
1.0molCHCl3 is heated from 273K to 300K. Calculate the
changein molar entropy of the sample.

Answers

Answer : The change in molar entropy of the sample is 10.651 J/K.mol

Explanation :

To calculate the change in molar entropy we use the formula:

$\Delta S=n\int\limits^(T_f)_(T_i){(C_(p,m)dT)/(T)$

where,

$\Delta S$ = change in molar entropy

n = number of moles = 1.0 mol

$T_f$ = final temperature = 300 K

$T_i$ = initial temperature = 273 K

$C_(p,m)$ = heat capacity of chloroform = $91.47+7.5* 10^(-2)(T/K)$

Now put all the given values in the above formula, we get:

$\Delta S=1.0\int\limits^(300)_(273){((91.47+7.5* 10^(-2)(T/K))dT)/(T)$

$\Delta S=1.0* [91.47\ln T+7.5* 10^(-2)T]^(300)_(273)$

$\Delta S=1.0* 91.47\ln ((T_f)/(T_i))+7.5* 10^(-2)(T_f-T_i)$

$\Delta S=1.0* 91.47\ln ((300)/(273))+7.5* 10^(-2)(300-273)$

$\Delta S=8.626+2.025$

$\Delta S=10.651J/K.mol$

Therefore, the change in molar entropy of the sample is 10.651 J/K.mol

Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and YCl2, where X and Y represent symbols of the imaginary elements. Chemical analysis of the two compounds reveals that 0.25 mol XCl2 has a mass of 100.0 g and 0.50 mol YCl2 has a mass of 125.0 g. (a) What are the molar masses of XCl2 and YCl2

Answers

Answer:

THE MOLAR MASS OF XCL2 IS 400 g/mol

THE MOLAR MASS OF YCL2 IS 250 g/mol.

Explanation:

We calculate the molar mass of XCL2 and YCL2 by bringing to mind the formula for molar mass when mass and amount or number of moles of the substance is given.

Number of moles = mass / molar mass

Molar mass = mass / number of moles.

For XCL2,

mass = 100 g

number of mole = 0.25 mol

So therefore, molar mass = mass / number of moles

Molar mass = 100 g / 0.25 mol

Molar mass = 400 g/mol.

For YCL2,

mass = 125 g

number of mole = 0.50 mol

Molar mass = 125 g / 0.50 mol

Molar mass = 250 g/mol.

So therefore, the molar mass of XCL2 and YCL2 IS 400 g/mol and 250 g/mol respectively.

Final answer:

The molar mass of XCl2 is 400 g/mol and the molar mass of YCl2 is 250 g/mol.

Explanation:

To find the molar masses of XCl2 and YCl2, we can use the relationship between molar mass, moles, and mass. The molar mass is calculated by dividing the mass of a compound by the number of moles.

For XCl2, we have 0.25 mol and 100.0 g. So, the molar mass of XCl2 is 100.0 g / 0.25 mol = 400 g/mol.

For YCl2, we have 0.50 mol and 125.0 g. So, the molar mass of YCl2 is 125.0 g / 0.50 mol = 250 g/mol.

Learn more about Molar mass here:

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What substance is produced by the reaction: H+[aq]+OH-[aq]=?

Answers

Answer:

It produces water.

Explanation:

H+ + OH- produces H2O.

It is a type of Neutralization reaction.

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