Which statement best describes how atoms combine to form sodium chloride (NaCl)?
2 answers:
Answer: Option (D) is the correct answer.
Explanation:
A bond generated after transfer of an electron from one atom to another is known as an ionic bond. And, a bond generated by sharing of electron(s) between two atoms is known as a covalent bond.
Sodium is a metal with atomic number 11 and electronic distribution 2, 8, 1. On the other hand, chlorine is a non-metal with atomic number 17 and electronic distribution 2, 8, 7.
So, in order to attain stability sodium will lose one electron and develop a positive charge as . Whereas chlorine at the same time will take up one electron from sodium atom and acquire a negative charge as
.
Thus, we can conclude that the statement a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.
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Answer:- 448 mL of hydrogen gas are formed.
Solution:- It asks to calculate the volume of hydrogen gas formed in milliliters at STP when 0.020 moles of magnesium reacts with excess HCl acid. The balanced equation is:
There is 1:1 mol ratio between Mg and hydrogen gas. So, the moles of hydrogen gas is also equals to the moles of Mg reacted.
moles of Hydrogen gas formed = 0.020 mol
At STP, volume of 1 mol of the gas is 22.4 L. We need to calculate the volume of 0.02 moles of hydrogen gas.
= 0.448 L
They want answer in mL. So, let's convert L to mL using the conversion formula, 1L = 1000mL
= 448 mL
So, 0.020 moles of magnesium would produce 448 mL of hydrogen gas at STP on reacting with excess of HCl acid.