The number of covalent bonds that an atom can make is determined by the no. of electrons needed to form a duplet or octet of electron by each of the atom.
The temperature dropped because B. energy was absorbed during the chemical reaction.
If energy was released, the temperature would rise. If there was no energy input, the temperature would stay the same. Since temperature dropped, it means that energy was absorbed.
Answer:
B. 3
Explanation:
There is a total of 3 hydrogen atoms on each side of the equation.
<u>Answer:</u> The enthalpy change of the combustion of ethane is -3122 kJ.
<u>Explanation:</u>
Combustion reaction is defined as the reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water molecules.
Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as
The equation used to calculate enthalpy change is of a reaction is:
For the given chemical reaction:
The equation for the enthalpy change of the above reaction is:
We are given:
Putting values in above equation, we get:
Hence, the enthalpy change of the combustion of ethane is -3122 kJ.
I guess you mean 3x 10^4 atoms of nitrogen
number of moles = number of particles / Avogadro's constant
= 3.0x10^4 / 6.02x10^23 =4.98 x 10^-20 mol