Please somebody help

Explanation:

#9

Here find moles using the molarity and volume

Molarity=moles/volume

2= x/0.125 (here we converted ml to L because volume is in liters for molarity)

x= 0.25 moles

The convert moles to molecules by multiplying with 6.022x10^23 you should get 1.51x10^23 molecules.

#10

Here use M1V1=M2V2

50*3=200x

x= 0.75M

#11, so do M1V1=M2V2

250*1.25=8x

x=39.06ml

So measure out 39.06mL of 8.0M HCl.

Add water until the 250mL of solution is full (I am unsure how to phrase this... basically have to add water until it reaches 250mL volume mark and you primarily perform dilutions in volumetric flask which only has one mark for accuracy)

#12

So here find the moles of sugar (7g) in 240mL (0.240L) in solution. Find moles using molar mass by dividing the grams of sugar by molar mass. Then just divide those moles by 0.240 L and you get 0.085M.

a. Units will be moles/litre or M

b. We are given grams of sugar (7g) and milliliters of solution (240mL).

c. Yes, need molar mass of sugar.

same for this one please recheck my work since I did it in hurry but should be fine.

it's all four options.