2) A lab tech makes 150.0 mL of 0.175 M HCl in a flask.
a) How many moles of HCl are there in this solution?
b) How many (not moles but actual Cl- particles) Clions are there in the flask (not moles but actual
Cl particles)?

A. 0.02625mole

B. 6.02x10^23 ions

Explanation:

A. The following were obtained from the question:

Volume = 150mL = 150/1000 = 0.15L

Molarity = 0.175M

Mole =?

Molarity = mole / Volume

Mole = Molarity x Volume

Mole = 0.175 x 0.15

Mole = 0.02625mole

B. Avogadro's hypothesis suggest that 1mole of any substance contains 6.02x10^23 molecules, atoms or ions. This implies that 1mole HCl contains 6.02x10^23 molecules.

The dissociation of HCl is given below:

HCl <==> H+ + Cl-

From the equation,

1 mole of HCl contains 1 mole of Cl-

ion and Avogadro's hypothesis suggests that 1mole of any substance contains 6.02x10^23 molecules, atoms or ions. Therefore 1mole of Cl- contains 6.02x10^23 ions.

This means that there are 6.02x10^23 ions of Cl in HCl

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

the dependant variable is spilled water

the independent is the heat