A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:

Time (mins) Mass of Hydrochloric Acid and Magnesium (g)
0 160.0 g
10 156.5 g
20 152.0 g
30 147.5 g
40 142.5 g

Question

A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:

Time (mins)	Mass of Hydrochloric Acid and Magnesium (g)
0	160.0 g
10	156.5 g
20	152.0 g
30	147.5 g
40	142.5 g

anonymous · Answer

@aaronq

anonymous · Answer

What does the data show is occurring?
The hydrochloric acid and magnesium metal react to form a precipitate.
The hydrochloric acid and magnesium metal react to form a gas.
The hydrochloric acid and magnesium metal do not react.
The hydrochloric acid and magnesium metal react to form a soluble compound.

aaronq · Answer

$Mg^o+2~HCl\rightarrow \color{red}{H_{2~(g)}}+MgCl_2$