Answer: 2.51 moles of oxygen is consumed
Explanation:
Exothermic reaction : It is a type of chemical reaction where the energy is released into the surrounding. In the exothermic reaction, the energy of reactant are more than the energy of product.
In exothermic reaction, the change in enthalpy is, negative
The balanced chemical reaction is:
According to stoichiometry:
When 1 mole of oxygen is consumed , energy released = 285.8 kJ
285.8 kJ of energy is evolved when oxygen consumed = 1 mol
Thus whn 717.4 kJ of energy is evolved when oxygen consumed = moles
2.51 moles of oxygen is consumed
Answer:
As hydrogen is more electronegative than boron, in BH3 the oxidation number of hydrogen should be taken as -1. (E. N. of B = 2.0 & E. N. of H = 2.1)
Suppose, oxidation number of B is x.
So, we can write, x + 3*(-1) = 0
=> x = +3
Therefore, oxidation num
Explanation:
As hydrogen is more electronegative than boron, in BH3 the oxidation number of hydrogen should be taken as -1. (E. N. of B = 2.0 & E. N. of H = 2.1)
Suppose, oxidation number of B is x.
So, we can write, x + 3*(-1) = 0
=> x = +3
Therefore, oxidation num
<span>Exothermic reactions have a potential energy difference between the products and reactants that is negative. </span>
<>"Thomson's experiments with cathode ray tubes helped him to discover the electron (which Dalton did not know about). Dalton thought that atoms were indivisible particles, and Thomson's discovery of the electron proved the existence of subatomic particles."<>
The answer is B.