Answer:
a billion boron atoms are contained in a mass m= 2.21*10⁻¹⁴ gr of tetraborane
Explanation:
Since there are an Avogadro number (N= 6.023*10²³ molecules/mole) of molecules of tetraborane in a mole of tetraborane , and per each molecule there are 4 atoms of B . Then
number of moles n = a/(4*N)
where a= number of atoms
the corresponding mass of tetraborane m is
m= n*M
where M= molecular weight of tetraborane = 53.32 g/mol
then
m= n*M = a*M/(4*N)
replacing values
m= a*M/(4*N)= 1.0*10⁹ atoms of B * 53.32 gr/mole /( 4 atoms of B/molecule* 6.023*10²³ molecules/mole ) = 2.21*10⁻¹⁴ gr
m= 2.21*10⁻¹⁴ gr
Potential Chemical energy
Explanation:
Potential Chemical energy is stored in a fossil fuel and released in the form of kinetic heat energy when it is burnt.
Potential energy is the energy at rest in a body. It is that energy when no change is happening to a body. There are different forms of potential energy. A good example in fossil fuels is chemical energy.
Kinetic energy of a body is the energy due to the motion of a body. It occurs when particles of a medium are agitated. An example of kinetic energy in fossil fuel occurs when it is burnt.
- the formative process of a fossil fuel stores chemical energy.
- the process prevents energy rich carbon atoms from being converted back into nature by decomposers.
- the hydrocarbon chain stores chemical energy
- the energy is released when the molecules are burnt and they form heat energy, a form of thermal energy.
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A 25.00 ml sample of hydrochloric acid solution, HCl, is titrated with 0.0512 m NaOH solution. the volume of NaOH solution required is 21.68 ml then the molarity of the HCl solution is 0.044 M .
Calculation ,
Formula used : ...( i )
Where M is the molarity or concentration and V is the volume in ml .
concentration of hydrochloric acid solution ( ) = ?
concentration of NaOH ( ) = 0.0512 M
volume of hydrochloric acid solution ( ) = 25.00 ml
volume of NaOH ( ) = 21.68 ml
Putting the value of concentration , volume of both in equation ( i ) we get .
× 25.00 ml = 0.0512 × 21.68 ml
= 0.0512 × 21.68 ml / 25.00 ml= 0.044 M
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Answer:
It will increase the kinetic energy of gas particles and hence gas will expand.
Explanation:
According to law, there is direct relationship between temperature (thermal energy) of gas and it's volume. When the pressure of gas is held constant and it's temperature increases then the volume of gas also gets increases.
When the temperature ( thermal energy) of gas increases then the kinetic energy of particles of gas also gets increases due to which particles start to collide with the wall of container and with themselves as well which in turn causes gas to expand.
The answer is: A; Free Energy