You are posting this in the wrong forum.
Anyway, find the work done by the force, then find the work done to bring it from a lower to a higher region, to increase the velocity, etc. , and just minus off all of them to find the work done to overcome friction.
If there is no friction, the marble will just slide along the surface without any rolling. Friction is what is "pulling" the bottom of the ball, causing the top of the ball to fall, which makes it roll.
http://en.wikipedia.org/wiki/Hydrogen_chloride#Production
Otherwise, make yourself vomit and extract/purify the HCl.
Why do you want to make it anyway? If you want a strong acid, the other acids are easier to get.
You can see the ions here and how they are bonded, giving them their charge.
http://en.wikipedia.org/wiki/Sulfate
http://en.wikipedia.org/wiki/Sulfite
Google is your friend.
Does CN neutral exist?
No.
Free -CN radicals do exists, but as said, they are free radicals and have a single electron on them. Giving them an overall charge.
if it will their will be a triple bond but their will be 1 single electron left in the carbon atom
"There". Not "their".
now if...
What is the precipitate formed?
What is the ratio of reactants to products? (e.g. if A + 2B --> B2A, then B : B2A is 2 : 1)
Knowing this you can solve.