In most turbochargers, the lubricating oil comes A. from an internal engine resevoir. B. under pressure through lines in the eng
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Answer:
Explanation:
To start with, the mass of a substance is centered on the amount of particles contained in it.
Mass of a substance measure is the same anywhere it is taken.
In chemistry, the concept of mole is used to find the exact estimate of the number of entities in a sample.
A mole of substance is quantity that is used to express the number of particles contained in it.
1 mole of any substance contains the Avogadro's number of particles.
This amount of particles is given as 6.02 x 10²³; the particles can be protons, neutrons, electrons e.t.c.
To find the number of moles;
Number of moles =
Through this, we clearly ascertain the number of entities in a sample given the mass.
<u>Answer:</u> The amount of energy released per gram of is -71.92 kJ
<u>Explanation:</u>
For the given chemical reaction:
The equation used to calculate enthalpy change is of a reaction is:
The equation for the enthalpy change of the above reaction is:
Taking the standard enthalpy of formation:
Putting values in above equation, we get:
We know that:
Molar mass of pentaborane -9 = 63.12 g/mol
By Stoichiometry of the reaction:
If 2 moles of produces -9078.57 kJ of energy.
Or,
If of
produces -9078.57 kJ of energy
Then, 1 gram of will produce =
of energy.
Hence, the amount of energy released per gram of is -71.92 kJ