The maximum size the balloon can get before popping (or flying off the flask) is 6.00 l at 1.00 atm of pressure and a temperature of 45°c. what maximum concentration of hydrochloric acid can be used (to just keep the balloon from popping) if 65.0 ml of hcl is added to 9.00 g of magnesium?

The maximum concentration of HCl that can be used is 7.08 M

Explanation:

The reaction that takes place is:

The available moles of Mg are:

H₂ gas is produced and fills the balloon. We use PV=nRT to calculate the maximum moles of H₂ that can be produced before the balloon pops off:

Now that we know that we have more than enough moles of Mg to produce 0.230 moles of H₂, we know that HCl is the limiting reactant.

We calculate the required moles of HCl:

Now we use C = n/V to calculate the concentration of HCl:

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

the answer is barium and copper bromide