In the reaction of magnesium metal with hydrochloric acid, how do you determine when the magnesium metal has reacted completely? a. All of the water has evaporated.
b. The magnesium metal is gone.
c. The dilute HCl is gone.
d. Gas bubbles are no longer produced.

Bar graph

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

Hno3(aq) → h+(aq) + no3−(aq). picture ii best represents the strong acid hno3. strong acids are strong electrolytes

Acovalent bond is formed between the two hydrogen bonds