Yo sup??
CaCO3 + 2 HCl ---------> CaCl2 + H2O + CO2
This is the balanced chemical equation
Hope this helps
The balanced chemical equation for reaction of
and
is as follows:

From the balanced chemical equation, 2 mol of
reacts with 1 mol of
.
First calculating number of moles of
as follows:

On rearranging,

Here, M is molarity and V is volume. The molarity of
is given 0.274 M or mol/L and volume 155 mL, putting the values,

Since, 1 mol of
reacts with 2 mol of
thus, number of moles of
will be
.
Now, molarity of
is given 0.305 M or mol/L thus, volume can be calculated as follows:

Therefore, volume of
is 278.5 mL.
Answer:
It's the 4th one. The car is accelerating gradually.
The answer is •c•
Hope this is correct I tried