Calculate the atomic number of an element whose atomic nucleus has mass number 23 and neutron number 12?? what is the symbol of
1 answer:
Explanation:
•Neutron = Mass number - Atomic number
•Atomic number = Mass number - Neutron
neutron = 12 • mass number = 23
Therefore,
Atomic number = 23 - 12
• Atomic number = 11
The element which having Atomic number 11 is sodium. Which is represented by symbol Na.
<h3>Representations of given element:</h3>Check the attachment .
You might be interested in
Answer:
number of moles of the compound 53 mole
Explanation:
Given that:
The total energy liberated = - 2870 kJ ( here , the negative sign typical implies the release of energy due to the combustion reaction)
The equation of the reaction can be represented as:
The energy needed to synthesize 1 mole of compound X = - 54.1 kJ.mol
Thus;
The total energy = numbers of moles of compound × Energy needed to synthesize 1 mole of compound X
Making the numbers of moles of the compound the subject; we have;
numbers of moles of compound =
number of moles of the compound = 53.04990 mole
number of moles of the compound 53 mole to two significant figure